A district of Japan is dissolved when all towns or villages in the district become cities or are merged into the city. The following is a list of dissolved districts of Japan.

The date shown is the day the district was dissolved—i.e. the district was active until that date—and the reason why the district was dissolved is also shown.

Before Edo Period

• Unknown Suruga District (駿河郡), Suruga, Tokaido (Renamed to Suntō District
  Sunto District, Shizuoka
  is a district located in Shizuoka, Japan. The area is part of former Suruga Province.As of 2009, the district has an estimated population of 93,038 and a density of 543 persons per km². The total area is 171.48 km².-Towns and villages:...
  
  )
• Unknown Kudara District (百済郡), Settsu, (Merged into either Higashinari and Sumiyoshi Districts)
• Unknown Nuttari District (沼垂郡), Echigo, Hokurikudo (Merged into Kanbara District)
• Sengoku Era Hiuchi District (比内郡), Mutsu, Tozando (Merged into Akita District in Dewa Province)
• Sengoku Era Ogashima District (小鹿島郡), Dewa, Tozando (Merged into Akita District)
• Sengoku Era Yamada District (山田郡), Owari, Tokaido (Split and merged into Kasugai and Aichi
  Aichi District, Aichi
  is a district located in Aichi, Japan.As of September 1, 2008, the district had an estimated population of 91,533 and a density of 2,310.0 persons per km²...
  
   Districts)
• Early Edo Period Hanawa (鼻和郡), Hiraka (平賀郡), and Inaka (田舎郡) Districts, Mutsu, Tozando (Merged to form Tsugaru District)
• Early Edo Period Hiyama District (檜山郡), Dewa, Tozando (Renamed to Yamamoto District
  Yamamoto District, Akita
  is a district located in Akita, Japan.There are three towns in the district.*Fujisato*Happō*Mitane-District Timeline:*September 1, 1962 - The village of Yamamoto gained town status....
  
  )
• Early Edo Period Toshima District (豊島郡), Dewa, Tozando (Renamed to Kawabe District
  Kawabe District, Akita
  Kawabe was a district located in Akita, Japan. , the district had an estimated population of 18,264 and a density of 40.99 persons per km²...
  
  )
• Early Edo Period Yamamoto District (山本郡), Dewa, Tozando (Renamed to Senboku District
  Senboku District, Akita
  is a district located in Akita, Japan. In 2005, the district has an estimated population of 23,757 and a density of 141.58 persons per km². The total area is 167.80 km².-Mergers:...
  
  )
• Early Edo Period Yuza District (遊佐郡), Dewa, Tozando (Renamed to Akumi District
  Akumi District, Yamagata
  is a district located in Yamagata Prefecture, Japan.As of 2003, the district has an estimated population of 36,844 and a density of 57.99 persons per km². The total area is 635.31 km².-Merger:...
  
  )
• Early Edo Period Kujibiki District (櫛引郡), Dewa, Tozando (Merged into Tagawa District)
• Edo Period Shikama District (色麻郡), Mutsu, Tozando (Merged into Kami District
  Kami District, Miyagi
  is a district located in Miyagi Prefecture, Japan.As of 2010, the district has an estimated population of 33,240 and a population density of 58,3 persons per km². The total area is 570.05 km².-History:...
  
  )
• 1634 Nukanobe District (糠部郡), Mutsu, Tozando (Split into Kita, Sannohe
  Sannohe District, Aomori
  is a district located in Aomori Prefecture, Japan. It occupies the southeast corner of the prefecture, bordering Iwate Prefecture.As of 2010, the district has an estimated population of 73,955 and a density of 76.3 persons per km². The total area was 969.38 km².- Towns and villages :The...
  
  , Ninohe
  Ninohe District, Iwate
  is a district located in Iwate Prefecture, Japan. As of May 2008, the district has an estimated Population of 14,880 and a population density of 49.6 persons/km²...
  
  , and Kunohe
  Kunohe District, Iwate
  is a district located in Iwate Prefecture, Japan.The district has two towns and two villages.*Hirono*Karumai*Kunohe*Noda-History:*January 1, 2006 - The municipalities of Ōno and Taneichi merged to form the new town of Hirono....
  
   Districts)
• 1700 Noto District (能登郡), Noto, Hokurikudo (Renamed to Kashima District
  Kashima District, Ishikawa
  is a district located in Ishikawa, Japan.As of April 1, 2005 population data, the district has an estimated population of 18,952 and a density of 212 persons per km²...
  
  )
• 1700 Kaga District (加賀郡), Kaga, Hokurikudo (Renamed to Kahoku District
  Kahoku District, Ishikawa
  is a district located in Ishikawa, Japan.As of 2003, the district has an estimated population of 62,374 and a density of 476.79 persons per km². The total area is 130.82 km².-Merger:...
  
  )
• Edo Period Mashiki District (益城郡), Higo, Saikaido (Split into Kamimashiki
  Kamimashiki District, Kumamoto
  is a district located in Kumamoto Prefecture, Japan.As of the Yamato merger but with 2003 population statistics, the district had an estimated population of 90,315 and a density of 115.2 persons per square kilometer...
  
   and Shimomashiki
  Shimomashiki District, Kumamoto
  is a district located in Kumamoto Prefecture, Japan.Following the March 23, 2010 Kumamoto merger the district consists of the single town of Misato. After the merger, the district has an estimated population of 11,164 and a density of 77.5 persons per square kilometer...
  
   Districts)

1868 to 1895

• 1878 Kita District (北郡), Mutsu (Split into Kamikita
  Kamikita District, Aomori
  is a district located in Aomori Prefecture, Japan. It occupies the east-central portion of the prefecture, south of Shimokita Peninsula.As of 2010, the district has an estimated population of 100,526 and a density of 78.5 persons per km². The total area was 1281.05 km².- Towns and villages...
  
   and Shimokita
  Shimokita District, Aomori
  is a district located in Aomori Prefecture, Japan. It occupies most of the northern handle of Shimokita Peninsula with the exception of Mutsu City and contains the most northern point on the island of Honshū...
  
   Districts in Aomori Prefecture)
• 1878 Tsugaru District (津軽郡), Mutsu (Split into Kitatsugaru
  Kitatsugaru District, Aomori
  is a district located in Aomori Prefecture, Japan.As of 2003, the district has an estimated population of 59,751 and a density of 110.21 persons per km²...
  
  , Minamitsugaru
  Minamitsugaru District, Aomori
  is a district located in Aomori Prefecture, Japan.As of 2003, the district has an estimated population of 93,748 and a density of 133.76 persons per km²...
  
  , Higashitsugaru
  Higashitsugaru District, Aomori
  is a district located in Aomori, Japan.As of 2003, the district has an estimated population of 29,235 and a density of 44.79 persons per km². The total area is 652.72 km².-Towns and villages:*Hiranai*Imabetsu*Sotogahama*Yomogita-Merger:...
  
  , Nishitsugaru
  Nishitsugaru District, Aomori
  is a district located in Aomori, Japan.As of 2003 , the district has an estimated population of 24,033 and a density of 28.9 persons per km²...
  
   and Nakatsugaru
  Nakatsugaru District, Aomori
  is a district located in Aomori Prefecture. The district has an estimated population of 1,599 with a total area of 246,58 km².The district contains only one village.*Nishimeya-Timeline:* April 1, 1889...
  
   Districts in Aomori Prefecture)
• 1878 Hei District (閉伊郡), Rikuchu (Split into Kitahei, Minamihei, Higashihei, Nishihei and Nakahei Districts in Iwate Prefecture)
• 1878 Iwai District (磐井郡), Rikuchu (Split into Higashiiwai
  Higashiiwai District, Iwate
  Higashiiwai was a district located in Iwate, Japan.As of September 1, 2005, the district had an estimated population of 10,026...
  
   and Nishiiwai
  Nishiiwai District, Iwate
  is a district located in Iwate Prefecture, Japan.As of 2005, the district has an estimated population of 8,782. The total area is 63.39 km².After the 3rd city of Ichinoseki creation on September 20, 2005, the district has only one town left.*Hiraizumi...
  
   Districts in Iwate Prefecture)
• 1878 Akita District (秋田郡), Ugo (Split into Kitaakita
  Kitaakita District, Akita
  is a district located in Akita, Japan.As of 2003, the district has an estimated population of 3,145 and a density of 12.25 persons per km². The total area is 256.82 km².-Mergers:...
  
   and Minamiakita
  Minamiakita District, Akita
  is a district located in Akita, Japan.As of 2003, the district has an estimated population of 28,411. The total area is 454.97 km².-Towns and villages:*Gojōme*Hachirōgata*Ikawa*Ōgata-Merger:...
  
   Districts in Akita Prefecture)
• 1878 Tagawa District (田川郡), Uzen (Split into Higashitagawa
  Higashitagawa District, Yamagata
  is a district located in Yamagata Prefecture, Japan.As of 2003, the district has an estimated population of 67,663 and a density of 61.25 persons per km²...
  
   and Nishitagawa
  Nishitagawa District, Yamagata
  Nishitagawa was a district located in Yamagata, Japan.As of 2003, the district has an estimated population of 9,921 and a density of 38.84 persons per km². The total area is 255.40 km²....
  
   Districts in Yamagata Prefecture)
• 1878 Murayama District (村山郡), Uzen (Split into Kitamurayama
  Kitamurayama District, Yamagata
  is a district located in Yamagata Prefecture, Japan.As of 2003, the district has an estimated population of 9,065 and a population density of 113.90 persons per km². The total area is 79.59 km².-Towns and villages:*Ōishida...
  
  , Minamimurayama, Higashimurayama
  Higashimurayama District, Yamagata
  is a district located in Yamagata Prefecture, Japan.As of 2003, the district has an estimated population of 28,238 and a density of 304.98 persons per km². The total area is 92.59 km².-Towns and villages:*Nakayama*Yamanobe...
  
  , and Nishimurayama
  Nishimurayama District, Yamagata
  is a district located in Yamagata, Japan.As of 2003, the district has an estimated population of 47,043 and a density of 59.08 persons per km². The total area is 796.26 km².-Towns and villages:*Asahi*Kahoku*Nishikawa*Ōe...
  
   Districts in Yamagata Prefecture)
• 1878 Okitama District (置賜郡), Uzen (Split into Higashiokitama
  Higashiokitama District, Yamagata
  is a district located in Yamagata Prefecture, Japan.As of 2003, the district has an estimated population of 45,338 and a density of 130.85 persons per km². The total area is 346.50 km².-Towns and villages:*Kawanishi*Takahata...
  
  , Nishiokitama
  Nishiokitama District, Yamagata
  is a district located in Yamagata, Japan.As of 2003, the district has an estimated population of 35,166 and a density of 28.71 persons per km². The total area is 1,224.89 km².-Towns and villages:*Iide*Oguni*Shirataka...
  
  , and Minamiokitama Districts in Yamagata Prefecture)
• 1878 Aizu District (会津郡), Iwashiro (Split into Kitaaizu
  Kitaaizu District, Fukushima
  was a district located in Fukushima, Japan.On November 1, 2004 the village of Kitaaizu was merged into the city of Aizuwakamatsu, at which point the village and district ceased to exist....
  
   and Minamiaizu
  Minamiaizu District, Fukushima
  is a district located in Fukushima, Japan. It makes up the southern third of the Aizu region in western Fukushima Prefecture.As of 2003, the district has an estimated population of 33,533 and a density of 14.32 persons per km². The total area is 2,341.64 km²...
  
   Districts in Fukushima Prefecture)
• 1878 Shirakawa District (白川郡), Iwaki (Renamed to Higashishirakawa District
  Higashishirakawa District, Fukushima
  is a district located in Fukushima, Japan.As of 2003, the district has an estimated population of 38,087 and a density of 61.34 persons per km². The total area is 620.94 km².-Towns and villages:*Hanawa*Samegawa*Tanagura*Yamatsuri...
  
   in Fukushima Prefecture)
• 1878 Shirakawa District (白河郡), Iwaki (Renamed to Nishishirakawa District
  Nishishirakawa District, Fukushima
  is a district located in Fukushima, Japan.As of 2003, the district has an estimated population of 68,450 and a density of 138.39 persons per km². The total area is 494.63 km².-Towns and villages:*Izumizaki*Nakajima*Nishigō*Yabuki-Merger:...
  
   in Fukushima Prefecture)
• 1878 Ibaraki District (茨城郡), Hitachi (Split into Higashiibaraki
  Higashiibaraki District, Ibaraki
  is a district located in Ibaraki, Japan.As of 2003, the district has an estimated population of 122,478 and a density of 284 persons per km². The total area is 431.44 km².-Towns and villages:*Ibaraki*Ōarai*Shirosato-Mergers:...
  
   and Nishiibaraki
  Nishiibaraki District, Ibaraki
  Nishiibaraki , literally West Ibaraki, was a district located in Ibaraki, Japan. As of 2004, the district has an estimated population of 52,291...
  
   Districts in Ibaraki Prefecture)
• 1878 Tsuga District (都賀郡), Shimotsuke (Split into Kamitsuga
  Kamitsuga District, Tochigi
  was a district located in Tochigi, Japan.As of 2003, the district had an estimated population of 20,718 and a density of 52.44 persons per km². The total area was 395.11 km².-Towns and villages:*Ashio*Awano*Nishikata-Mergers:...
  
   and Shimotsuga
  Shimotsuga District, Tochigi
  is a district located in Tochigi, Japan.As of 2011, the district has an estimated population of 83,304 and a density of 603 persons per km². The total area is 138.07 km².-Merger:...
  
   Districts in Tochigi Prefecture)
• 1878 Habu District (埴生郡), Kazusa (Renamed to Kamihabu District in Chiba Prefecture)
• 1878 Habu District (埴生郡), Shimousa (Renamed to Shimohabu District in Chiba Prefecture)
• 1878 Souma District (相馬郡), Shimousa (Split into Kitasouma District
  Kitasouma District, Ibaraki
  Kitasōma is a district located in Ibaraki, Japan.As of March 1, 2005, the district has a population of 18,734. The total area is 24.90 km².Currently, the district has only one town left.*Tone-Timeline:...
  
   in Ibaraki Prefecture and Minamisouma District
  Minamisouma District, Chiba
  -District Timeline:*1878 Founded after the former Souma District areas designated within Chiba Prefecture.*1889 At the time of municipal status enforcement, the district had 2 towns and 4 villages....
  
   in Chiba Prefecture)
• 1878 Katsushika District (葛飾郡), Shimousa (Split into Nishikatsushika District in Ibaraki Prefecture, Nakakatsushika District in Saitama Prefecture, and Higashikatsushika District
  Higashikatsushika District, Chiba
  was a district located in Chiba, Japan until March 27, 2005. On March 28, 2005 the district was dissolved when the town of Shōnan merged into the city of Kashiwa.-Area:...
  
   in Chiba Prefecture)
• 1878 Katsushika District (葛飾郡), Musashi (Split into Kitakatsushika District
  Kitakatsushika District, Saitama
  is a district located in Saitama Prefecture, Japan.As of July 1, 2011, the district has an estimated population of 77,583 and a population density of 1,680 persons per km²...
  
   in Saitama Prefecture and Minamikatsushika District in Tokyo Prefecture)
• 1878 Saitama District (埼玉郡), Musashi (Split into Kitasaitama
  Kitasaitama District, Saitama
  was a district located in Saitama Prefecture.Prior to its abolition, Kita-Saitama District had three towns:*Town of Kisai *Town of Kitakawabe *Town of Ōtone...
  
   and Minamisaitama Districts in Saitama Prefecture)
• 1878 Adachi District (足立郡), Musashi (Split into Kitadachi District
  Kitaadachi District, Saitama
  is a district located in Saitama Prefecture, Japan.As of September 1, 2005, the district has an estimated population of 36,979 and a density of 2,498.58 persons per km². The total area is 14.80 km²...
  
   in Saitama Prefecture and Minamiadachi District in Tokyo Prefecture)
• 1878 Toshima District (豊嶋郡), Musashi (Split into Kitatoshima and Minamitoshima Districts in Tokyo Prefecture)
• 1878 Tama District (多摩郡), Musashi (Split into Higashitama District in Tokyo Prefecture, Kitatama
  Kitatama District, Tokyo
  was a district in the Japanese prefecture of Kanagawa from 1878 to 1893 and then in the prefecture of Tokyo until 1970.In 1878, the Meiji government made the first step to introduce modern administrative divisions on the municipal level: The districts were created from the premodern districts ...
  
  , Minamitama, and Nishitama Districts in Kanagawa Prefecture)
• 1878 Kanbara District (蒲原郡), Echigo (Split into Kitakanbara
  Kitakanbara District, Niigata
  is a district located in Niigata, Japan. As of April 1, 2005, the district has an estimated population of 13,528. The total area is 37.99 km². The district has one town: Seirō.- History :...
  
  , Minamikanbara
  MinamiKanbara District, Niigata
  is a district located in Niigata, Japan.When the district was formed back in the Meiji Period, the district covered the cities of Sanjō and Mitsuke, the town of Tagami, and parts of Kamo and the northern part of Nagaoka....
  
  , Higashikanbara
  Higashikanbara District, Niigata
  is a district located in Niigata, Japan.As of March 31, 2006, the district has an estimated population of 15,169 and a density of 15.92 persons per km²...
  
  , Nishikanbara
  Nishikanbara District, Niigata
  is a district located in Niigata, Japan.As of March 20, 2006, the district has an estimated population of 8,537. The total area is 25.22 km².- Towns and villages :On March 20, 2006, the towns of Bunsui and Yoshida merged with the former city of Tsubame...
  
   and Nakakanbara
  Nakakanbara District, Niigata
  Nakakanbara was a district located in Niigata Prefecture, Japan.-History:In 1878, Nakakanbara District was established.The district started to shrink after the town of Nuttary merged and Niigata continued to absorb the district...
  
   Districts, and the borough of Niigata in Niigata Prefecture)
• 1878 Uonuma District (魚沼郡), Echigo (Split into Kitauonuma
  Kitauonuma District, Niigata
  was a district located in Niigata, Japan.- History :* On 1954, areas now covering Ojiya merged and gained city status.* On November 1, 2004 towns of Horinouchi and Koide, and the villages of Hirokami, Irihirose, Sumon and Yunotani merged to create the new city of Uonuma; leaving the village of...
  
  , Nakauonuma
  Nakauonuma District, Niigata
  is a district located in Niigata, Japan.As of April 1, 2005, the district has a population of 11,754. The area is now 372.80 km².The district has one village*Tsunan-History:...
  
  , and Minamiuonuma
  Minamiuonuma District, Niigata
  is a district located in Niigata, Japan.As of 2003, the district has an estimated population of 72,908 and a density of 77.41 persons per km². The total area is 941.82 km².- Mergers :...
  
   Districts in Niigata Prefecture)
• 1878 Kubiki District (頸城郡), Echigo (Split into Higashikubiki
  Higashikubiki District, Niigata
  Higashikubiki was a district located in Niigata, Japan. The district was founded when the former Kubiki District split into Higashikubiki District, Nakakubiki District, and Nishikubiki District...
  
  , Nakakubiki
  Nakakubiki District, Niigata
  Nakakubiki was a district located in Niigata, Japan. The district was founded in 1878, when the former Kubiki District split into Higashikubiki District, Nakakubiki District, and Nishikubiki District...
  
  , and Nishikubiki
  Nishikubiki District, Niigata
  Nishikubiki was a district located in Niigata, Japan. The district was founded in 1878, when the former Kubiki District split into Higashikubiki District, Nakakubiki District, and Nishikubiki District. At the time of founding, the district covered the city of Itoigawa and the Nadachi District in...
  
   Districts in Niigata Prefecture)
• 1878 Niikawa District (新川郡), Ecchu (Split into Kaminiikawa
  Kaminiikawa District, Toyama
  Kaminiikawa was a district located in Toyama, Japan.As of 2003, the district had an estimated population of 34,491 and a density of 53.31 persons per km²...
  
   and Shimoniikawa
  Shimoniikawa District, Toyama
  is a district located in Toyama, Japan.As of 2003, the district has an estimated population of 49,118 and a density of 77.09 persons per km². The total area is 637.19 km².-Mergers:...
  
   Districts in Toyama Prefecture)
• 1878 Tsuru District (都留郡), Kai (Split into Kitatsuru
  Kitatsuru District, Yamanashi
  is a district located in Yamanashi, Japan.As of 2003, the district has an estimated population of 29,030 and a density of 103.79 persons per km². The total area is 279.71 km².There are only two villages left in the district.*Kosuge*Tabayama-History:...
  
   and Minamitsuru
  Minamitsuru District, Yamanashi
  is a district located in Yamanashi Prefecture, Japan.As of 2003, the district has an estimated population of 49,180 and a population density of 122.73 persons per km²...
  
   Districts in Yamanashi Prefecture)
• 1878 Yamanashi District (山梨郡), Kai (Split into Higashiyamanashi
  Higashiyamanashi District, Yamanashi
  Higashiyamanashi was a district located in Yamanashi Prefecture, Japan.As of 2004, the district had an estimated population of 10,701...
  
   and Nishiyamanashi Districts in Yamanashi Prefecture)
• 1878 Yatsushiro District (八代郡), Kai (Split into Higashiyatsushiro
  Higashiyatsushiro District, Yamanashi
  Higashiyatsushiro was a district located in Yamanashi, Japan.As of March 2006, the district has an estimated population of 513. The total area is 37.15 km²....
  
   and Nishiyatsushiro
  Nishiyatsushiro District, Yamanashi
  is a district located in Yamanashi Prefecture, Japan.As of February 1, 2006, the district has an estimated population of 17,878 and a density of 238 persons per km²...
  
   Districts in Yamanashi Prefecture)
• 1878 Koma District (巨摩郡), Kai (Split into Kitakoma
  Kitakoma District, Yamanashi
  Kitakoma was a district located in Yamanashi, Japan. The district was dissolved on March 15, 2006 when the town of Kobuchisawa merged into the city of Hokuto.-Timeline:* 1878: The district was formed out from the former Koma District....
  
  , Nakakoma
  Nakakoma District, Yamanashi
  is a district located in Yamanashi, Japan.As of 2006, the district has an estimated population of 16,273. The total area is 9.15 km².The district has only one town.*Shōwa-District Timeline:...
  
  , and Minamikoma
  Minamikoma District, Yamanashi
  is a district located in Yamanashi, Japan.As of 2003, the district has an estimated population of 41,454 and a density of 48.37 persons per km². The total area is 856.96 km².-Towns and villages:*Fujikawa*Hayakawa*Minobu*Nanbu-Mergers:...
  
   Districts in Yamanashi Prefecture)
• 1878 Saku District
  Saku District, Nagano
  was a district located in Shinano Province or Nagano Prefecture.The former is estimated to be located at Nagatoro in the city of Saku....
  
   (佐久郡), Shinano (Split into Kitasaku
  Kitasaku District, Nagano
  is a district located in Nagano Prefecture, Japan.As of December 1, 2005, the district has an estimated population of 40,041.The district has three towns*Karuizawa*Miyota*Tateshina-District Timeline:...
  
   and Minamisaku
  Minamisaku District, Nagano
  is a district located in Nagano Prefecture, Japan.As of December 1, 2005, the district has an estimated population of 29,263. As of December 2005, the district have two towns and four villages.*Kawakami*Kitaaiki*Koumi*Minamiaiki*Minamimaki*Sakuho...
  
   Districts in Nagano Prefecture)
• 1878 Takai District (高井郡), Shinano (Split into Kamitakai
  Kamitakai District, Nagano
  Kamitakai is a district located in Nagano, Japan.As of 2003, the district has an estimated population of 19,073 and a density of 162.23 persons per km². The total area is 117.57 km².-Towns and villages:*Obuse*Takayama...
  
   and Minamitakai Districts in Nagano Prefecture)
• 1878 Minochi District (水内郡), Shinano (Split into Kamiminochi
  Kamiminochi District, Nagano
  is a district located in Nagano Prefecture, Japan.As of 2011, the district has an estimated population of 23,774. As a result of mergers the total area of the district is now 282.65 km².- Towns and villages :*Iizuna*Ogawa*Shinano- Mergers :...
  
   and Shimominochi
  Shimominochi District, Nagano
  Shimominochi is a district located in Nagano Prefecture, Japan.As of 2003, the district has an estimated population of 7,643 and a density of 24.96 persons per km². The total area is 306.25 km².-Mergers:...
  
   Districts in Nagano Prefecture)
• 1878 Ina District (伊那郡), Shinano (Split into Kamiina
  Kamiina District, Nagano
  Kamiina is a district located in Nagano, Japan.As of May, 2008, the district has an estimated Population of 86,453 and a Density of 168 persons/km²...
  
   and Shimoina
  Shimoina District, Nagano
  is a district located in Nagano Prefecture, Japan.As of May, 2008, the district has an estimated Population of 65,359 and a Density of 51.4 persons/km²...
  
   Districts in Nagano Prefecture)
• 1878 Chikuma District (筑摩郡), Shinano (Split into Higashichikuma
  Higashichikuma District, Nagano
  is a district located in Nagano Prefecture, Japan.As of October 1, 2011, the district has an estimated population of 23,044. The total area is 268.42 km²...
  
   and Nishichikuma Districts in Nagano Prefecture)
• 1878 Azumi District (安曇郡), Shinano (Split into Kitaazumi
  Kitaazumi District, Nagano
  is a district located in Nagano Prefecture, Japan.As of 2003, the district has an estimated population of 36,547 and a density of 57.31 persons per km². The total area is 637.66 km².-Towns and villages:*Hakuba*Ikeda*Matsukawa*Otari-Mergers:...
  
   and Minamiazumi
  Minamiazumi District, Nagano
  Minamiazumi was a district located in Nagano Prefecture, Japan.As of 2003, the district had an estimated population of 99,785 and a density of 117.22 persons per km²...
  
   Districts in Nagano Prefecture)
• 1878 Ishizu District (石津郡), Mino (Split into Kamiishizu and Shimoishizu Districts in Gifu Prefecture)
• 1878 Shitara District (設楽郡), Mikawa (Split into Kitashitara
  Kitashitara District, Aichi
  is a rural district located in northeastern Aichi Prefecture, Japan.As of August 2010, the district had an estimated population of 10,797 and a population density of 19.5 persons per km²...
  
   and Minamishitara
  Minamishitara District, Aichi
  is a former rural district located in eastern Aichi Prefecture, Japan.As of 2004 , the district had an estimated population of 16,703 and a population density of 43.84 persons per km². Its total area was 381.06 km².-History:...
  
   Districts in Aichi Prefecture)
• 1878 Kamo District (加茂郡), Mikawa (Split into Higashikamo
  Higashikamo District, Aichi
  was a former rural district located in Nishimikawa Region in central Aichi, Japan. The entire district is now part of the city of Toyota.-History:Kamo District was one of the ancient districts of Shinano province, but was transferred to Mikawa province during the Sengoku period...
  
   and Nishikamo
  Nishikamo District, Aichi
  was a former rural district located in Nishimikawa Region in central Aichi, Japan.-History:Kamo District was one of the ancient districts of Shinano province, but was transferred to Mikawa province during the Sengoku period...
  
   Districts in Aichi Prefecture)
• 1878 Kasugai District (春日井郡), Owari (Split into Higashikasugai
  Higashikasugai District, Aichi
  Higashikasugai was a district located in Aichi, Japan.Located on the northeastern Owari Region, covering the current cities of Komaki, Kasugai, Seto, and Owariasahi.-See also:*List of dissolved districts of Japan*Aichi Prefecture...
  
   and Nishikasugai
  Nishikasugai District, Aichi
  is a district located in Aichi, Japan.-About:Located on the central Owari Region. The population is 22,194 people; the total area is 10.20 km²...
  
   Districts in Aichi Prefecture)
• 1878 Muro District
  Muro District, Kii
  Muro was a district located at Kii Province.Muro District was the largest district located at the southwestern Ki Peninsula and covered half of Ki Province, but in 1879, the district split off into Kitamuro and Minamimuro Districts in Mie Prefecture and Higashimuro and Nishimuro Districts in...
  
   (牟婁郡), Kii (Split into Kitamuro and Minamimuro Districts in Mie Prefecture and Higashimuro
  Higashimuro District, Wakayama
  Higashimuro is a district located in Wakayama, Japan. As of September 1, 2008, the district has an estimated Population of 43,306 and a Density of 64.8 persons/km²...
  
   and Nishimuro
  Nishimuro District, Wakayama
  is a district located in Wakayama, Japan. As of September 1, 2008, the district has an estimated Population of 42,840 and a Density of 98.9 persons/km²...
  
   Districts in Wakayama Prefecture)
• 1878 Azai District (浅井郡), Ōmi (Split into Higashiazai
  Higashiazai District, Shiga
  was a district located in Shiga Prefecture, Japan.From the reports of 2005 Census, the district had an estimated population of 14,509. The total area was 38.53km².-Timeline:*April 1, 1971 - The village of Biwa gained town status....
  
   and Nishiazai
  Nishiazai District, Shiga
  Nishiazai was a district located in Shiga Prefecture. The district is equivalent to the town of Nishiazai in Ika District.-Timeline:*1878 Azai District splits into Nishiazai and Higashiazai Districts....
  
   Districts in Shiga Prefecture)
• 1878 Kuwata District (桑田郡), Tanba (Split into Kitakuwada
  Kitakuwada District, Kyoto
  Kitakuwada was a district located in Kyoto Prefecture, Japan.As of 2005, the district had an estimated population of 5,233 and a density of 15.37 persons per km²...
  
   and Minamikuwada Districts in Kyoto Prefecture)
• 1878 Ukena District
  Ukena District, Iyo
  was a district located in central Iyo Province. Due to the 1878 Land Reforms, the district was separated into 2 districts written below....
  
   (浮穴郡), Iyo (Split into Kamiukena
  Kamiukena District, Ehime
  The is a district located in Ehime Prefecture, Japan. As of 2004 — The estimated population is 11,222 with a total area of 583.66 km².It consists of one town.*Kumakōgen-History:...
  
   and Shimoukena Districts in Ehime Prefecture)
• 1878 Uwa District (宇和郡), Iyo (Split into Higashiuwa
  Higashiuwa District, Ehime
  was a district located in Ehime Prefecture. Due to the mergers the district dissolved on April 1, 2004.-History:* 1878 — The Uwa District was split up by Meiji era land reforms. The Higashiuwa District was thus born...
  
  , Nishiuwa
  Nishiuwa District, Ehime
  The is a district located in Ehime Prefecture. As of 2007 — The district has an estimated population of 12,304 with a total area of 94.34 km².The district consists of one town.*Ikata- History :...
  
  , Kitauwa
  Kitauwa District, Ehime
  The is a district located in Ehime Prefecture, Japan. As of 2004, the district has an estimated population of 17,299. The total area is 340.37 km².The district has two towns:*Kihoku*Matsuno-History:...
  
  , and Minamiuwa
  Minamiuwa District, Ehime
  The is a district located in Ehime Prefecture, Japan. As of 2004, the estimated population is 28,100 and the total area is 239.54 km².The district includes one town.*Ainan-History:...
  
   Districts in Ehime Prefecture)
• 1878 Matsuura District (松浦郡), Hizen (Split into Higashimatsuura
  Higashimatsuura District, Saga
  is a district located in Saga Prefecture, Japan. At the present it has only one town.As of February 1, 2009, the district has an estimated population of 21,066 and a density of 320 persons per km²...
  
  , Nishimatsuura
  Nishimatsuura District, Saga
  is a district located in Saga Prefecture, Japan.As of February 1, 2009, the district has an estimated population of 21,066 and a density of 320 persons per km²...
  
  , Kitamatsuura
  Kitamatsuura District, Nagasaki
  is a district located in Nagasaki, Japan.As of August 1, 2011, the district has an estimated population of 16,270 and a density of 282 persons per km²...
  
  , and Minamimatsuura Districts in Nagasaki Prefecture)
• 1878 Sonogi District (彼杵郡), Hizen (Split into Higashisonogi
  Higashisonogi District, Nagasaki
  is a district located in Nagasaki, Japan.As of January 1, 2009, the district has an estimated population of 39,012 and a density of 233 persons per km². The total area is 167.47 km².-Towns and villages:*Hasami*Higashisonogi*Kawatana...
  
   and Nishisonogi
  Nishisonogi District, Nagasaki
  is a district located in Nagasaki, Japan.As of January 1, 2009, the district has an estimated population of 72,238 and a density of 1460 persons per km²...
  
   Districts, and the borough of Nagasaki in Nagasaki Prefecture)
• 1878 Takaki District (高来郡), Hizen (Split into Kitatakaki
  Kitatakaki District, Nagasaki
  was a district located in Nagasaki, Japan.On January 4, 2005 all towns from this district merged with the City of Isahaya to form the new City of Isahaya. The District of Kitatakaki was dissolved due to this merger....
  
   and Minamitakaki
  Minamitakaki District, Nagasaki
  was a district located in Nagasaki, Japan. The district was dissolved on March 31, 2006.The district was equivalent to the cities of Shimabara, Unzen, and Minamishimabara....
  
   Districts in Nagasaki Prefecture)
• 1878 Kunisaki District (国東郡), Bungo (Split into Higashikunisaki
  Higashikunisaki District, Oita
  ' is a district located in Ōita Prefecture, Japan.As of April 2006, the district has an estimated population of 2,898. The total area is now down to 6.75 km².There is only one village left in the district.*Himeshima...
  
   and Nishikunisaki
  Nishikunisaki District, Oita
  was a district located in Ōita, Japan.The district was dissolved on October 1, 2005.-District Timeline:* July 22, 1878 - Nishikunisaki District was founded after Kunisaki District broke off into Nishikunisaki and Higashikunisaki Districts....
  
   Districts in Ōita Prefecture)
• 1878 Amabe District (海部郡), Bungo (Split into Kitaamabe
  Kitaamabe District, Oita
  ' was a district located in Ōita, Japan.The district had only the town of Saganoseki until December 31, 2004. But on January 1, 2005 Saganoseki, along with the town of Notsuharu, from Ōita District, merged into the expanded city of Ōita, and the district was dissolved.-Municipal Timeline:* July 22,...
  
   and Minamiamabe
  Minamiamabe District, Oita
  was a district located in Ōita, Japan.As of 2003, the district had an estimated population of 33,239 and the density of 47.09 persons per km². The total area was 705.90 km²....
  
   Districts in Ōita Prefecture)
• 1878 Usuki District (臼杵郡), Hyuga (Split into Higashiusuki
  Higashiusuki District, Miyazaki
  Higashiusuki is a district located in Miyazaki, Japan.As of 2006, the district has an estimated population of 31,269 and the density of 24.18 persons per km²...
  
   and Nishiusuki
  Nishiusuki District, Miyazaki
  Nishiusuki is a district located in Miyazaki, Japan.As of 2003, the district has an estimated population of 25,479 and the density of 37.10 persons per km². The total area is 686.77 km².-Towns and villages:*Gokase*Hinokage*Takachiho...
  
   Districts in Kagoshima Prefecture)
• 1878 Naka District (那珂郡), Hyuga (Split into Kitanaka and Minaminaka
  Minaminaka District, Miyazaki
  Minaminaka is a district located in Miyazaki Prefecture.Until the day before the dissolution, the district contained two towns.* Kitagō* Nangō-Timeline:...
  
   Districts in Kagoshima Prefecture)
• 1878 Ōsumi District (大隅郡), Ōsumi (Split into Kitaōsumi and Minamiōsumi Districts in Kagoshima Prefecture)
• 1878 Soo District (囎唹郡), Osumi (Split into Higashisoo and Nishisoo Districts in Kagoshima Prefecture)
• 1878 Isa District (伊佐郡), Satsuma (Split into Kitaisa and Minamiisa Districts in Kagoshima Prefecture)
• July 8, 1881 Abashiri District (網尻郡), Kushiro, Hokkaidō (Merged into Abashiri District in Kitami Province)
• July 27, 1881 Tsugaru (津軽郡) and Fukushima (福島郡) Districts, Oshima, Hokkaidō (Merged to form Matsumae District
  Matsumae District, Hokkaido
  is a district located in southwestern Oshima Subprefecture, Hokkaidō, Japan.As of 2004, the district has an estimated population of 16,068 and a density of 33.45 persons per km²...
  
  )
• May 9, 1883 Morokata District (諸県郡), Hyuga (Due to the split of Kagoshima Prefecture, the area became part of the new Miyazaki Prefecture becomes Kitamorokata District
  Kitamorokata District, Miyazaki
  Kitamorokata is a district located in Miyazaki, Japan.As of the Miyakonojō merger but with 2003 population statistics, the district has an estimated population of 26,752 and a density of 243 persons per km²...
  
   and parts remaining in Kagoshima Prefecture became Minamimorokata District
  Minamimorokata District, Kagoshima
  Minamimorokata was a district of Japan located in Kagoshima Prefecture. In 1883, when Miyazaki Prefecture was split from Kagoshima Prefecture, the district was formed when Morokata District was split between two prefectures...
  
  )
• April 1, 1889 Samukawa District (寒川郡), Shimotsuke (Merged into Shimotsuga District
  Shimotsuga District, Tochigi
  is a district located in Tochigi, Japan.As of 2011, the district has an estimated population of 83,304 and a density of 603 persons per km². The total area is 138.07 km².-Merger:...
  
  )

1896

• February 26, 1896 Nakatsu District (仲津郡), Fukuoka (Merged into Miyako District
  Miyako District, Fukuoka
  is a district located in Fukuoka, Japan.As of 2003, the district has an estimated population of 58,747 and a density of 297.09 persons per km². The total area is 197.74 km².-Mergers:...
  
  )
• February 26, 1896 Tsuiki (築城郡) and Kōge (上毛郡) Districts, Fukuoka (Merged to form Chikujō District
  Chikujo District, Fukuoka
  is a district located in Fukuoka Prefecture, Japan.As of 2003, the district has an estimated population of 36,695 and a density of 195.79 persons per square kilometer...
  
  )
• February 26, 1896 Ito (怡土郡) and Shima (志摩郡) Districts, Fukuoka (Merged to form Itoshima District)
• February 26, 1896 Mikasa (御笠郡), Mushiroda (席田郡), and Naka (那珂郡) Districts, Fukuoka (Merged to form Chikushi District
  Chikushi District, Fukuoka
  is a district located in Fukuoka, Japan.As of 2003, the district has an estimated population of 46,540 and a density of 620.62 persons per square kilometer. The total area is 74.99 km².-Towns and villages:*Nakagawa...
  
  )
• February 26, 1896 Kama (嘉麻郡) and Honami (穂波郡) Districts, Fukuoka (Merged to form Kaho District
  Kaho District, Fukuoka
  is a district located in Fukuoka, Japan.As of 2006, the district has an estimated population of 14,648 and a density of 729.85 persons per km². The total area is 20.07 km².-Mergers:...
  
  )
• February 26, 1896 Johza (上座郡), Geza (下座郡), and Yasu (夜須郡) Districts, Fukuoka (Merged to form Asakura District
  Asakura District, Fukuoka
  is a district located in Fukuoka, Japan.As of 2003, the district has an estimated population of 50,658 and a density of 255.01 persons per km². The total area is 198.65 km²...
  
  )
• February 26, 1896 Kamitsuma (上妻郡) and Shimotsuma (下妻郡) Districts, Fukuoka (Merged to form Yame District
  Yame District, Fukuoka
  is a district located in Fukuoka Prefecture, Japan.As of April 1, 2010, the district has an estimated population of 20,230 and a density of 534 persons per km²...
  
  )
• February 26, 1896 Ikuha (生葉郡) and Takeno (竹野郡) Districts, Fukuoka (Merged to form Ukiha District
  Ukiha District, Fukuoka
  Ukiha was a district located in Fukuoka Prefecture, Japan.-Mergers:* On February 5, 2005, the town of Tanushimaru merged with three other towns into the expanded city of Kurume....
  
  )
• February 26, 1896 Mii (御井郡), Mihara (御原郡), and Yamamoto (山本郡) Districts, Fukuoka (Merged to form Mii District
  Mii District, Fukuoka
  is a district located in Fukuoka, Japan.As of 2003 statistics , the district has an estimated population of 15,378 and a density of 674 persons per km². The total area is 22.83 km².-Mergers:...
  
  )
• March 26, 1896 Osumi (大住郡) and Yurugi (淘綾郡) Districts, Kanagawa (Merged to form Naka District
  Naka District, Kanagawa
  is an administrative district of Japan located in central Kanagawa Prefecture. It currently consists of two towns, Ōiso, and Ninomiya.-History:Naka District was one of the four subdivisions of Sagami Province established by the late Hōjō clan of Odawara during the Sengoku period...
  
  )
• March 26, 1896 Mine (三根郡), Yabu (養父郡), and Kii (基肄郡) Districts, Saga (Merged to form Miyaki District
  Miyaki District, Saga
  is a district located in Saga Prefecture, Japan.In February 2009, the district had an estimated population of 54,233 and a density of 625 per km²...
  
  )
• March 29, 1896 Kitakunohe (北九戸郡) and Minamikunohe (南九戸郡) Districts, Iwate (Merged to form Kunohe District
  Kunohe District, Iwate
  is a district located in Iwate Prefecture, Japan.The district has two towns and two villages.*Hirono*Karumai*Kunohe*Noda-History:*January 1, 2006 - The municipalities of Ōno and Taneichi merged to form the new town of Hirono....
  
  )
• March 29, 1896 Kitaiwate (北岩手郡) and Minamiiwate (南岩手郡) Districts, Iwate (Merged to form Iwate District
  Iwate District, Iwate
  is a district located in Iwate, Japan. As of 2003, the district has an estimated population of 142,495. The total area is 2,846.44 km². The district covers the northern part of Morioka Metropolitan Area...
  
  )
• March 29, 1896 Higashiwaga (東和賀郡) and Nishiwaga (西和賀郡) Districts, Iwate (Merged to form Waga District
  Waga District, Iwate
  is a district located in Iwate Prefecture. Since 2006, it has included just the town of Nishiwaga.-History:* 1878 Due to the land reforms, the district split into Higashiwaga and Nishiwaga Districts....
  
  )
• March 29, 1896 Nishihei (西閉伊郡) and Minamihei (南閉伊郡) Districts, Iwate (Merged to form Kamihei District
  Kamihei District, Iwate
  is a district located in Iwate, Japan.Following the Tōno merger the district consists of the single town of Ōtsuchi. As of 2004, the district has an estimated population of 16,521. The total area is 200.58 km²....
  
  )
• March 29, 1896 Kitahei (北閉伊郡), Nakahei (中閉伊郡), and Higashihei (東閉伊郡) Districts, Iwate (Merged to form Shimohei District
  Shimohei District, Iwate
  is a district located in Iwate Prefecture, Japan.Following the merger of Tarō and Niisato into Miyako and as of 2003 population data, the district has an estimated population of 43,747 and a population density of 21.39 persons per km²...
  
  )
• March 29, 1896 Nishikatsushika District (西葛飾郡), Ibaraki (Merged into Sashima District
  Sashima District, Ibaraki
  Sashima is a district located in Ibaraki, Japan.Following the Bandō merger but with 2004 population data, the district has an estimated population of 125,153 and a density of 726 persons per km²...
  
  )
• March 29, 1896 Kawachi (河内郡) and Shida (信太郡) Districts, Ibaraki (Merged to form Inashiki District
  Inashiki District, Ibaraki
  is a district located in Ibaraki, Japan.Following the Inashiki merger but as of 2003 population data, the district has an estimated population of 77,059 and a density of 538 persons per km². The total area is 143.32 km².-Mergers:...
  
  )
• March 29, 1896 Toyoda (豊田郡) and Okada (岡田郡) Districts, Ibaraki (Merged into Yūki District)
• March 29, 1896 Koma District (高麗郡), Saitama (Merged into Iruma District
  Iruma District, Saitama
  is a district located in Saitama Prefecture, Japan.In the 2005 census reports, the district has an estimated population of 89,552. The total area is 89.77 km².The district consists of three towns:*Miyoshi*Moroyama*Ogose-District timeline:...
  
  )
• March 29, 1896 Niikura District (新座郡), Saitama (Merged into Kitaadachi District
  Kitaadachi District, Saitama
  is a district located in Saitama Prefecture, Japan.As of September 1, 2005, the district has an estimated population of 36,979 and a density of 2,498.58 persons per km². The total area is 14.80 km²...
  
  )
• March 29, 1896 Hatara (幡羅郡), Hanzawa (榛沢郡), and Obusuma (男衾郡) Districts, Saitama (Merged into Ōsato District
  Osato District, Saitama
  is a district located in Saitama Prefecture, Japan.As of 2003, the district has an estimated population of 130,305 and a population density of 629.34 persons per km²...
  
  )
• March 29, 1896 Kami (賀美郡) and Naka (那珂郡) Districts, Saitama (Merged into Kodama District
  Kodama District, Saitama
  Kodama is a district located in Saitama, Japan.As of October 1, 2004, the district has an estimated population of 79,096. The total area is 163.10 km².There are three towns located side by side with the city of Honjō.*Kamikawa*Kamisato...
  
  )
• March 29, 1896 Yokomi District (横見郡), Saitama (Merged into Hiki District
  Hiki District, Saitama
  is a district located in Saitama Prefecture, Japan.As of 2003, the district has an estimated population of 145,235 and a population density of 515.31 persons per square kilometer...
  
  )
• March 29, 1896 Nakakatsushika District (中葛飾郡), Shimousa, Saitama (Merged into Kitakatsushika District
  Kitakatsushika District, Saitama
  is a district located in Saitama Prefecture, Japan.As of July 1, 2011, the district has an estimated population of 77,583 and a population density of 1,680 persons per km²...
  
   in Musashi Province)
• March 29, 1896 Asake District (朝明郡), Mie (Merged into Mie District
  Mie District, Mie
  Mie is a district located in Mie, Japan.As of the Kusu merger but with 2003 population estimates, the district has an estimated population of 57,507 and a density of 473 persons per km². The total area is 121.59 km².-Merger:...
  
  )
• March 29, 1896 Kawawa (河曲郡) and Anki (奄芸郡) Districts, Mie (Merged to form Kawage District)
• March 29, 1896 Iino (飯野郡) and Iitaka (飯高郡) Districts, Mie (Merged to form Iinan District
  Iinan District, Mie
  Iinan was a district located in Mie Prefecture. The district had an estimated population of 11,235 and the total area was 317.27 km². - Timeline :...
  
  )
• March 29, 1896 Ahai (阿拝郡) and Yamada (山田郡) Districts, Mie (Merged to form Ayama District
  Ayama District, Mie
  Ayama was a district located in Mie, Japan.As of 2003, the district had an estimated population of 27,539 and a density of 108.46 persons per km²...
  
  )
• March 29, 1896 Nabari (名張郡) and Iga (伊賀郡) Districts, Mie (Merged to form Naga District
  Naga District, Mie
  Naga was a district located in Mie, Japan.As of 2003, the district had an estimated population of 11,590 and a density of 106.33 persons per km²...
  
  )
• March 29, 1896 Tōshi (答志郡) and Ago (英虞郡) Districts, Mie (Merged to form Shima District
  Shima District, Mie
  Shima was a district located in Mie, Japan.The district was dissolved on October 1, 2004 when all five towns in the district merged to form the city of Shima, effectively turning the district into a city....
  
  )
• March 29, 1896 Soejimo (添下郡) and Heguri (平群郡) Districts, Nara (Merged to form Ikoma District
  Ikoma District, Nara
  Ikoma is a district located in Nara Prefecture, Japan.As of 2003, the district has an estimated population of 80,507 and a density of 1,569.34 persons per km². The total area is 51.30 km².- Towns and villages :* Ando* Heguri* Ikaruga...
  
  )
• March 29, 1896 Hirose (広瀬郡) and Katsuge (葛下郡) Districts, Nara (Merged to form Kitakatsuragi District
  Kitakatsuragi District, Nara
  Kitakatsuragi is a district located in Nara Prefecture, Japan.As of 2003, the district has an estimated population of 134,816 and a density of 1,886.07 persons per km². The total area is 71.48 km².-Towns and villages:*Kanmaki*Kawai...
  
  )
• March 29, 1896 Katsujō (葛上郡) and Oshimi (忍海郡) Districts, Nara (Merged to form Minamikatsuragi District)
• March 29, 1896 Shikijō (式上郡), Shikige (式下郡), and Toichi (十市郡) Districts, Nara (Merged to form Shiki District
  Shiki District, Nara
  is a district located in Nara Prefecture, Japan.As of 2003, the district has an estimated population of 50,009 and a density of 1,607.49 persons per km². The total area is 31.11 km².- Towns and villages :* Kawanishi* Miyake* Tawaramoto...
  
  )
• March 29, 1896 Ōmi (邑美郡), Hōmi (法美郡), and Iwai (岩井郡) Districts, Tottori (Merged to form Iwami District
  Iwami District, Tottori
  Iwami is a district located in Tottori, Japan.As of 2003, the district has an estimated population of 25,607 and a density of 102.13 persons per km². The total area is 250.72 km².-Merger:...
  
  )
• March 29, 1896 Yakami (八上郡), Hattō (八東郡), and Chizu (智頭郡) Districts, Tottori (Merged to form Yazu District
  Yazu District, Tottori
  Yazu is a district located in Tottori Prefecture, Japan.As of 2003, the district has an estimated population of 48,540 and a density of 55.43 persons per km²...
  
  )
• March 29, 1896 Takakusa (高草郡) and Keta (気多郡) Districts, Tottori (Ketaka District]])
• March 29, 1896 [[Kawamura District, Tottori)
• April 18, 1896 Kamiishizu District (上石津郡), Gifu (Merged with parts of Tagi District to form Yōrō District
  Yoro District, Gifu
  is a district located in Gifu, Japan.As of July 2011, the district has an estimated population of 31,058. The total area is 195.52 km².-Merger:*On March 27, 2006, the town of Kamiishizu, along with the town of Sunomata from Anpachi District, merged into the city of Ōgaki....
  
  )
• April 18, 1896 Kaisai (海西郡) and Shimoishizu (下石津郡) Districts, Gifu (Merged with parts of Anpachi District
  Anpachi District, Gifu
  is a district located in Gifu, Japan.As of July 2011, the district has an estimated population of 45,152. The total area is 62.71 km².-Merger:...
  
   to form Kaizu District)
• April 18, 1896 Kakami (各務郡) and Atsumi (厚見郡) Districts, Gifu (Merged with parts of Katagata District to form Inaba District)
• April 18, 1896 Katagata District (方県郡), Gifu (Split and became part of Inaba, Motosu
  Motosu District, Gifu
  is a district located in Gifu, Japan.As of July 2011 the district has an estimated population of 18,389. The total area is 5.17 km².The district has only one town.*Kitagata-District Timeline:*April 1, 1959-**The village of Shinsei gained town status....
  
  , and Yamagata
  Yamagata District, Gifu
  was a district located in Gifu, Japan. On April 1, 2003 both towns and the village from the district merged, effectively turning the district into the city of Yamagata....
  
   Districts)
• April 18, 1896 Mushiroda District (席田郡), Gifu (Merged with Motosu District, parts of Katagata District, and parts of Ōno District to form Motosu District
  Motosu District, Gifu
  is a district located in Gifu, Japan.As of July 2011 the district has an estimated population of 18,389. The total area is 5.17 km².The district has only one town.*Kitagata-District Timeline:*April 1, 1959-**The village of Shinsei gained town status....
  
  )
• April 18, 1896 Ōno District (大野郡), Gifu (Split and became part of Motosu
  Motosu District, Gifu
  is a district located in Gifu, Japan.As of July 2011 the district has an estimated population of 18,389. The total area is 5.17 km².The district has only one town.*Kitagata-District Timeline:*April 1, 1959-**The village of Shinsei gained town status....
  
   and Ibi
  Ibi District, Gifu
  is a district located in Gifu, Japan., the district has an estimated population of 72,109. The total area is 876.65 km².The area of the former village of Tokuyama in this district will be flooded by the Tokuyama Dam.-District Timeline:...
  
   Districts)
• April 18, 1896 Ikeda District (池田郡), Gifu (Merged with parts of Ōno District to form Ibi District
  Ibi District, Gifu
  is a district located in Gifu, Japan., the district has an estimated population of 72,109. The total area is 876.65 km².The area of the former village of Tokuyama in this district will be flooded by the Tokuyama Dam.-District Timeline:...
  
  )
• April 18, 1896 Shūfu (周布郡) and Kuwamura (桑村郡) Districts, Ehime (Merged to form Shūsō District
  Shuso District, Ehime
  was a district located in Ehime Prefecture, Japan. Due to the mergers, the district dissolved on November 1, 2004.-History:* April, 1897 — Shūfu District and Kuwamura District merged to become the Shūsō District....
  
  )
• April 18, 1896 Noma District
  Noma District, Ehime
  was a District located in Eastern Iyo Province . Due to the 1878 Land Reforms, the district merged with Ochi District and the district dissolved....
  
   (野間郡), Ehime (Merged into Ochi District
  Ochi District, Ehime
  The is a district located in Ehime Prefecture, Japan. As of 2004 the total population of 8,419 with a total area is 30.35 km².It consists of one town:*Kamijima-History:*September 12, 1895 — The village of Yuge broke off the village of Uoshima....
  
  )
• April 18, 1896 Kazahaya (風早郡), Wake (和気郡), and Kume (久米郡) Districts, Ehime (Merged along with parts of Shimonukena District into Onsen District
  Onsen District, Ehime
  was a district located in Ehime Prefecture. Due to the mergers — The district dissolved on January 1, 2005.The district had an estimated population of 40,690 and the total area was 248.73 km² .-History:This district was located in what is currently the center of Matsuyama...
  
  )
• April 18, 1896 Shimoukena District (下浮穴郡), Ehime (Split and merged into parts of Onsen
  Onsen District, Ehime
  was a district located in Ehime Prefecture. Due to the mergers — The district dissolved on January 1, 2005.The district had an estimated population of 40,690 and the total area was 248.73 km² .-History:This district was located in what is currently the center of Matsuyama...
  
   and Iyo
  Iyo District, Ehime
  The is a district located in Ehime Prefecture, Japan. As of 2004 the estimated population is 52,832 with a total area is 121.89 km².The district contains two towns*Masaki*Tobe-History:...
  
   Districts)

1897~1912

• April 1, 1897 Minamisouma District
  Minamisouma District, Chiba
  -District Timeline:*1878 Founded after the former Souma District areas designated within Chiba Prefecture.*1889 At the time of municipal status enforcement, the district had 2 towns and 4 villages....
  
   (南相馬郡), Chiba (Merged into Higashikatsushika District
  Higashikatsushika District, Chiba
  was a district located in Chiba, Japan until March 27, 2005. On March 28, 2005 the district was dissolved when the town of Shōnan merged into the city of Kashiwa.-Area:...
  
  )
• April 1, 1897 Shimohabu District (下埴生郡), Chiba (Merged into Inba District
  Inba District, Chiba
  is a district located in Chiba, Japan.As of 2011, the district has an estimated population of 43,480 and a density of 845 persons per km². The total area is 51.48 km².There are two towns within the district.*Sakae*Shisui-District timeline:...
  
  )
• April 1, 1897 Hei (平郡), Asai
  Asai District, Chiba
  was an administrative district of Japan located in southern Chiba Prefecture. Its name was also written with the alternative kanji 朝平郡, with the same pronouciation.- History :...
  
   (朝夷郡), and Nagasa
  Nagasa District, Chiba
  was an administrative district of Japan located in southern Chiba Prefecture.- History :Nagasa District was one of the four districts created in former Awa Province on April 1, 1889. Much of the area of the district was part of the former Hanabusa Domain. At the time of its foundation, the district...
  
   (長狭郡) Districts, Chiba (Merged into Awa District
  Awa District, Chiba
  is a district located in Chiba, Japan.As of August 2010, the district had an estimated population of 8,992 and a density of 198 persons per km². Its total area was 45.16 km².-History:...
  
  )
• April 1, 1897 Mōda (望陀郡), Sue (周淮郡), and Amaha (天羽郡) Districts, Chiba (Merged to form Kimitsu District
  Kimitsu District, Chiba
  was an administrative district in Chiba Prefecture Japan. The district was dissolved April 1, 1991 when the town of Sodegaura gained city status.-Location:Kimitsy District covered the area of the present day cities of Kisarazu, Futtsu, Kimitsu, and Sodegaura....
  
  )
• April 1, 1897 Yamabe (山辺郡) and Musha (武射郡) Districts, Chiba (Merged to form Sanbu District
  Sanbu District, Chiba
  is a district located in Chiba, Japan.As of September 2010, the district had an estimated population of 100,954 and a population density of 525 persons per km²...
  
  )
• April 1, 1897 Nagara (長柄郡) and Kamihabu (上埴生郡) Districts, Chiba (Merged to form Chōsei District
  Chosei District, Chiba
  is a district located in Chiba Prefecture, Japan. As of September 2010, the district has an estimated population of 63,382 and a density of 279 persons per km². The total area was 226.97 km²...
  
  )
• April 1, 1897 Nishiazai District
  Nishiazai District, Shiga
  Nishiazai was a district located in Shiga Prefecture. The district is equivalent to the town of Nishiazai in Ika District.-Timeline:*1878 Azai District splits into Nishiazai and Higashiazai Districts....
  
  (西浅井郡), Shiga (Merged into Ika District
  Ika District, Shiga
  Ika was a district located in Shiga, Japan.As of 2003, the district had an estimated population of 27,986 and a density of 79.65 persons per km². The total area was 351.38 km²....
  
  )
• October 1, 1898 Fukatsu (深津郡) and Yasuna (安那郡) Districts, Hiroshima (Merged to form Fukayasu District
  Fukayasu District, Hiroshima
  Fukayasu was a district located in Hiroshima Prefecture until 2006. On October 1, 1898, the district was formed by the mergers of both Fukatsu and Yasuna Districts. On March 1, 2006, the last remaining town of Kannabe merged into the city of Fukuyama and the district dissolved...
  
  )
• October 1, 1898 Ashida (芦田郡) and Honji (品治郡) Districts, Hiroshima (Merged to form Ashina District)
• October 1, 1898 Miyoshi (三次郡) and Mitani (三谿郡) Districts, Hiroshima (Merged to form Futami District
  Futami District, Hiroshima
  Futami was a district located in Hiroshima, Japan. on April 1, 2004, all six towns and villages located in this district, along with the town of Kōnu in Kōnu District merged with old Miyoshi to form the new Miyoshi....
  
  )
• October 1, 1898 Nuka (奴可郡), Mikami (三上郡), and Eso (恵蘇郡) Districts, Hiroshima (Merged to form Hiba District
  Hiba District, Hiroshima
  was a district located in Hiroshima, Japan.As of 2003, the district had an estimated population of 21,448 and a density of 23.00 persons per km². The total area was 932.44 km².-Former towns and villages:...
  
  )
• October 1, 1898 Numata (沼田郡) and Takamiya (高宮郡) Districts, Hiroshima (Merged to form Asa District)
• March 16, 1899 Ōuchi (大内郡) and Sangawa (寒川郡) Districts, Kagawa (Merged to form Ōkawa District
  Okawa District, Kagawa
  was a district in Kagawa Prefecture, Japan. Currently, the area represents now two new cities:*Sanuki, Kagawa - western part that was founded on April 1, 2002, consisting the merger of the towns of Ōkawa, Nagao, Sangawa Shido and Tsuda...
  
  )
• March 16, 1899 Miki (三木郡) and Yamada (山田郡) Districts, Kagawa (Merged to form Kita District
  Kita District, Kagawa
  is a district located in Kagawa, Japan.As of the January 10, 2006 Takamatsu merger, the district consists of the town of Miki with an estimated population of 29,015 and a density of 382.88 persons per km²...
  
  )
• March 16, 1899 Aya (阿野郡) and Uta (鵜足郡) Districts, Kagawa (Merged to form Ayauta District
  Ayauta District, Kagawa
  is a district located in Kagawa, Japan.As of the Takamatsu merger but using 2000 population data, the district has an estimated population of 41,598 and a density of 353 persons per km²...
  
  )
• March 16, 1899 Naka (那珂郡) and Tado (多度郡) Districts, Kagawa (Merged to form Nakatado District
  Nakatado District, Kagawa
  is a district located in Kagawa Prefecture.Due to the district government enforcement in 1899, the district was formed when the Naka and Tado Districts merged.The district contains 3 towns.*Kotohira*Tadotsu*Mannō-Timeline:...
  
  )
• March 16, 1899 Mino (三野郡) and Toyota (豊田郡) Districts, Kagawa (Merged to form Mitoyo District
  Mitoyo District, Kagawa
  was a district located in Kagawa, Japan. On January 1, 2006 all seven towns in the district merged forming the city of Mitoyo at which point the district was dissolved....
  
  )
• April 1, 1900 Mashima (真島郡), and Ōba (大庭郡) Districts, Okayama (Merged to form Maniwa District
  Maniwa District, Okayama
  Maniwa is a district located in Okayama, Japan.In 2003 the district had an estimated population of 48,246 and a density of 58.53 persons per km²...
  
  )
• April 1, 1900 Saisaijō (西西条郡), Saihokujō (西北条郡), Tōnanjō (東南条郡), and Tōhokujō(東北条郡) Districts, Okayama (Merged to form Tomata District
  Tomata District, Okayama
  Tomata is a district located in Okayama, Japan.As of 2003, the district has an estimated population of 20,631 and a density of 33.22 persons per km²...
  
  )
• April 1, 1900 Shōboku (勝北郡) and Shōnan (勝南郡) Districts, Okayama (Merged to form Katsuta District
  Katsuta District, Okayama
  Katsuta is a district located in Okayama, Japan.As of May 1, 2004, the population was 17,888. The area is 123.63 km².-History:Prior to February 28, Katsuta District consisted of:*Katsuta*Nagi*Shōboku*Shōō...
  
  )
• April 1, 1900 Yoshino District (吉野郡), Okayama (Merged into Aida District
  Aida District, Okayama
  Aida is a district located in Okayama, Japan.As of 2003, the district has an estimated population of 31,845 and a density of 79.65 persons per km²...
  
  )
• April 1, 1900 Kumehokujō (久米北条郡) and Kumenanjō (久米南条郡), Okayama (Merged to form Kume District
  Kume District, Okayama
  Kume is a district located in Okayama, Japan.As of 2003, the district has an estimated population of 30,640 and a density of 79.56 persons per km². The total area is 385.14 km².-Merger:...
  
  )
• April 1, 1900 Mino (御野郡) and Tsudaka (津高郡) Districts, Okayama (Merged to form Mitsu District
  Mitsu District, Okayama
  was a district located in Okayama, Japan. As of 2003, the district has an estimated population of 22,923. The total area is 345.10 km².On April 1, 1900, the district was founded after the mergers of Mino and Tsudaka Districts....
  
  )
• April 1, 1900 Akasaka (赤坂郡) and Iwanashi (磐梨郡) Districts, Okayama (Merged to form Akaiwa District
  Akaiwa District, Okayama
  Akaiwa was a district located in Okayama, Japan. As of 2004, the district has an estimated population of 14,945.The total area is 41.78 km²...
  
  )
• April 1, 1900 Tsuu (都宇郡) and Kuboya (窪屋郡) Districts, Okayama (Merged to form Tsukubo District
  Tsukubo District, Okayama
  Tsukubo is a district located in Okayama, Japan.As of 2003, the district has an estimated population of 21,601 and a density of 789.80 persons per km². The total area is 27.35 km².-Merger:...
  
  )
• April 1, 1900 Kayō (賀陽郡) and Shimotsu (下道郡) Districts, Okayama (Merged to form Kibi District
  Kibi District, Okayama
  Kibi is a district located in Okayama, Japan.As of 2003, the district has an estimated population of 22,927 and a density of 520.12 persons per km². The total area is 44.08 km²....
  
  )
• April 1, 1900 Tetta (哲多郡) and Aga (阿賀郡) Districts, Okayama (Merged to form Atetsu District
  Atetsu District, Okayama
  Atetsu was a district located in Okayama, Japan.As of 2003, the district had an estimated population of 13,546 and a density of 30.70 persons per km². The total area was 441.28 km².This district was dissolved on 31 March 2005....
  
  )
• April 1, 1906 Tōbui District (当縁郡), Hokkaidō (The villages of Taiki (大樹村), Berufune (歴舟村), and parts of Tōbui (当縁村) merged with other villages to form the village of Moyori (茂寄村) in Hiroo District
  Hiroo District, Hokkaido
  is a district located in Tokachi Subprefecture, Hokkaidō, Japan.As of 2004, the district has an estimated population of 16,735 and a density of 10.80 persons per km²...
  
  ; parts of the village of Tōbui merged with other villages to form the village of Ōtsu (大津村) in Tokachi District
  Tokachi District, Hokkaido
  is a district located in Tokachi Subprefecture, Hokkaidō, Japan.As of 2004, the district has an estimated population of 6,342 and a density of 8.69 persons per km². The total area is 729.64 km².-History:...
  
  )

1912~1926

• April 4, 1913 Kaito (海東郡) and Kaisai (海西郡) (Merged to form Ama District
  Ama District, Aichi
  is a district located in Aichi, Japan.As of September 1, 2011, the district has an estimated population of 71,240 and a density of 1,770 persons per km²...
  
  )
• February 1, 1918 Muroran District (室蘭郡), Hokkaidō (The town of Muroran and the villages of Wanishi, Chimaibetsu, and Motomuroran merged to form the borough of Muroran (now the city of Muroran
  Muroran, Hokkaido
  is a city and port located in Iburi, Hokkaidō, Japan. It is the capital city of Iburi Subprefecture.As of 2008, the city has an estimated population of 96,724 and a density of 1,210 people per km². The total area is 80.65 km².- History :...
  
  ))
• April 1923 Furebetsu District (振別郡), Hokkaidō (The village of Furebetsu(振別村) merged with other villages to form the village of Rubetsu in Etorofu)
• April 1, 1925 Higashinari District (東成郡), Osaka (Merged into the city of Osaka
  Osaka
  is a city in the Kansai region of Japan's main island of Honshu, a designated city under the Local Autonomy Law, the capital city of Osaka Prefecture and also the biggest part of Keihanshin area, which is represented by three major cities of Japan, Kyoto, Osaka and Kobe...
  
  )
• April 1, 1925 Nishinari District (西成郡), Osaka (Merged into the city of Osaka)

1927~1945

• April 1, 1931 Kii District (紀伊郡), Kyoto (The villages of Kamitoba, Kisshōin, Fukakusa, Shimotoba, Yokoōji, Nōso, Horiuchi,, Mukaijima, and Takeda merged into the city of Kyoto
  Kyoto
  is a city in the central part of the island of Honshū, Japan. It has a population close to 1.5 million. Formerly the imperial capital of Japan, it is now the capital of Kyoto Prefecture, as well as a major part of the Osaka-Kobe-Kyoto metropolitan area.-History:...
  
  )
• October 1, 1932 Ebara District (荏原郡), Tokyo (Merged into the city of Tokyo)
• October 1, 1932 Toyotama District (豊多摩郡), Tokyo (Merged into the city of Tokyo)
• October 1, 1932 Kitatoshima District (北豊島郡), Tokyo (Merged into the city of Tokyo)
• October 1, 1932 Minamiadachi District (南足立郡), Tokyo (Merged into the city of Tokyo)
• October 1, 1932 Minamikatsushika District (南葛飾郡), Tokyo (Merged into the city of Tokyo)
• October 1, 1936 Kuraki District (久良岐郡), Kanagawa (The town of Kanazawa and the village of Mutsuurashō merged into the city of Yokohama
  Yokohama
  is the capital city of Kanagawa Prefecture and the second largest city in Japan by population after Tokyo and most populous municipality of Japan. It lies on Tokyo Bay, south of Tokyo, in the Kantō region of the main island of Honshu...
  
  )
• October 1, 1938 Tachibana District (橘樹郡), Kanagawa (The villages of Mukaigaoka, Miyasaki, the town of Inada, and the village of Ikuta merged into the city of Kawasaki
  Kawasaki, Kanagawa
  is a city located in Kanagawa Prefecture, Japan, between Tokyo and Yokohama. It is the 9th most populated city in Japan and one of the main cities forming the Greater Tokyo Area and Keihin Industrial Area....
  
  )
• April 1, 1939 Tsutsuki District (都筑郡), Kanagawa (The village of Nitta, the town of Kawara, and the villages of Yamauchi, Nakasato, Nakagawa, Tana, Niiharu, Tsuoka, and Futamatagawa merged into the city of Yokohama
  Yokohama
  is the capital city of Kanagawa Prefecture and the second largest city in Japan by population after Tokyo and most populous municipality of Japan. It lies on Tokyo Bay, south of Tokyo, in the Kantō region of the main island of Honshu...
  
  ; the villages of Kakioeki and Okagami merged into the city of Kawasaki
  Kawasaki, Kanagawa
  is a city located in Kanagawa Prefecture, Japan, between Tokyo and Yokohama. It is the 9th most populated city in Japan and one of the main cities forming the Greater Tokyo Area and Keihin Industrial Area....
  
  )
• September 1, 1940 Otaru District (小樽郡), Hokkaidō (The village of Asari merged into the city of Otaru
  Otaru, Hokkaido
  is a city and port in Shiribeshi, Hokkaido, Japan, northwest of Sapporo. The city faces the Ishikari Bay, and has long served as the main port of the bay. With its many historical buildings, Otaru is a popular tourist destination...
  
  )
• September 1, 1940 Takashima District (高島郡), Hokkaidō (The town of Takashima merged into the city of Otaru
  Otaru, Hokkaido
  is a city and port in Shiribeshi, Hokkaido, Japan, northwest of Sapporo. The city faces the Ishikari Bay, and has long served as the main port of the bay. With its many historical buildings, Otaru is a popular tourist destination...
  
  )

1945~1959

• April 1, 1948 Kadono District (葛野郡), Kyoto (The villages of 小野郷 and 中川 merged into the city of Kyoto
  Kyoto
  is a city in the central part of the island of Honshū, Japan. It has a population close to 1.5 million. Formerly the imperial capital of Japan, it is now the capital of Kyoto Prefecture, as well as a major part of the Osaka-Kobe-Kyoto metropolitan area.-History:...
  
  )
• June 1, 1948 Kamakura District (鎌倉郡), Kanagawa (The town of 大船 merged into the city of Kanagawa
  Kamakura, Kanagawa
  is a city located in Kanagawa Prefecture, Japan, about south-south-west of Tokyo. It used to be also called .Although Kamakura proper is today rather small, it is often described in history books as a former de facto capital of Japan as the seat of the Shogunate and of the Regency during the...
  
  )
• September 10, 1948 Kiku District (企救郡), Fukuoka (The village of 東谷 merged into the city of Kokura (now the city of Kitakyūshū
  Kitakyushu, Fukuoka
  is a city located in Fukuoka Prefecture, Kyūshū, Japan. It is midway between Tokyo and Shanghai.- Demographics :Kitakyūshū has a population of just under one million...
  
  ))
• April 1, 1949 Otagi District (愛宕郡), Kyoto (The villages of 雲ヶ畑, 岩倉, 八瀬, 大原, 静市野, 鞍馬, 花背, and 久多 merged into the city of Kyoto
  Kyoto
  is a city in the central part of the island of Honshū, Japan. It has a population close to 1.5 million. Formerly the imperial capital of Japan, it is now the capital of Kyoto Prefecture, as well as a major part of the Osaka-Kobe-Kyoto metropolitan area.-History:...
  
  )
• April 1, 1950 Kitakanra District (北甘楽郡), Gunma (Renamed to Kanra District
  Kanra District, Gunma
  is a district located in Gunma, Japan.As of 2003, the district has an estimated population of 32,840 and a density of 83.27 persons per km². The total area is 394.38 km².-Towns and villages:*Kanra*Nanmoku*Shimonita-Mergers:...
  
  )
• January 1, 1951 Akashi District (明石郡), Hyōgo (The town of 大久保 and the village of 魚住 merged into the city of Akashi
  Akashi, Hyogo
  is a city located in southern Hyōgo Prefecture, Japan, on the Seto Inland Sea west of Kobe.As of April 1, 2011, the city has an estimated population of 290,776, with 117,392 households, and a population density of 5,907.68 persons per km²...
  
  )
• March 1, 1951 Uji District (宇治郡), Kyoto (The town of Higashiuji merged with the towns and villages from Kuse District and granted town status to form the city of Uji
  Uji, Kyoto
  is a city on the southern outskirts of the city of Kyoto, in Kyoto Prefecture, Japan. Founded on March 1, 1951, Uji is located between the two ancient capitals of Nara and Kyoto. The city sits on the Uji River, which has its source in Lake Biwa. As of April 1, 2008, Uji has an estimated population...
  
  )
• April 1, 1954 Himi District (氷見郡), Toyama (The villages of 神代, 仏生寺, 布勢, 十二町, 速川, 久目, 阿尾, 薮田, 宇波, and 女良 merged into the city of Himi
  Himi, Toyama
  is a city located in Toyama, Japan.As of June 1, 2011, the city has an estimated population of 52,721, with 17,331 households and the population density of 228.80 persons per km². The total area is 230.47 km².The city was founded on August 1, 1952....
  
  )
• April 1, 1954 Muko District (武庫郡), Hyōgo (The village of 良元 merged into the city of Takarazuka
  Takarazuka, Hyogo
  is a city located in Hyōgo Prefecture, Japan.- Geography :Takarazuka is nestled between the Rokko Range to the west and Nagao Range to the north with the Muko River running through the center of the city....
  
  )
• April 1, 1954 Ano District (安濃郡), Shimane (The villages of 佐比売, 朝山, and 富山 split and merged into the city of Ōda
  Oda, Shimane
  is a city located in Shimane, Japan.As of April 1, 2008, the city has an estimated population of 40,614 and the density of 90.2 persons per km². The total area is 436.11 km²...
  
   and the town of Tagi, Hikawa District
  Hikawa District, Shimane
  was a district located in Shimane, Japan.As of 2003, the district had an estimated population of 57,333 and a density of 185.14 persons per km². The total area was 309.68 km².- Towns and villages :*Hikawa*Koryō*Sada*Taisha*Taki-Merger:...
  
  (now the city of Izumo
  Izumo, Shimane
  is a city located in Shimane, Japan. Izumo is known for Izumo soba noodles and the Izumo Taisha Shinto shrine.-Demographics:The modern city was founded on November 3, 1941....
  
  ))
• October 17, 1954 Nishiyamanashi District (西山梨郡), Yamanashi (The villages of 山城, 住吉, 朝井, 玉諸, 甲運, 能泉, and 千代田 merged into the city of Kōfu
  Kofu, Yamanashi
  is the capital city of Yamanashi Prefecture in Japan.As of May 1, 2011, the city had a estimate population of 197,540, with 85,794 households. The total area is 212.41 km².-History:Kōfu's name means "capital of Kai Province"...
  
  )
• January 15, 1955 Utasutsu District (歌棄郡), Hokkaidō (The village of Utasutsu merged into the town of Suttsu
  Suttsu, Hokkaido
  is a town located in Suttsu District, Shiribeshi, Hokkaidō, Japan.As of 2008, the town has an estimated population of 3,606 and a density of 40.29 persons per km². The total area is 95.36 km².-External links:* in Japanese...
  
  , Suttsu District
  Suttsu District, Hokkaido
  is a district located in Shiribeshi Subprefecture, Hokkaidō, Japan.As of 2004, the district has an estimated population of 7,316 and a density of 16.60 persons per km². The total area is 440.83 km².-Towns:*Kuromatsunai*Suttsu...
  
  ; the village of Neppu merged with the village of Kuromatsunai and parts of the village of Tarukishi from Suttsu District to form the village of Sanwa (now the town of Kuromatsunai
  Kuromatsunai, Hokkaido
  is a town located in Suttsu District, Shiribeshi, Hokkaidō, Japan.As of March 2008, the town has an estimated population of 3,250 and a density of 9.76 persons per km². The total area is 345.47 km²....
  
  ))
• January 15, 1955 Tsuruga District (敦賀郡), Fukui (The villages of 東浦, 東郷, 中郷, 愛発, and 粟野 merged into the city of Tsuruga
  Tsuruga, Fukui
  is a city located in southern Fukui Prefecture, Japan.-Outline:One of city of Wakasa Area, present southern Fukui Prececture. Municipalized on April 1, 1937....
  
  )
• April 1, 1955 Futoru District (太櫓郡), Hokkaidō (The village of Futoru merged with the town of Tōsetana, Setana District
  Setana District, Hokkaido
  is a district located in Hiyama Subprefecture, Hokkaidō, Japan.As of 2004, the district has an estimated population of 15,173 and a density of 14.14 persons per km². The total area is 1,072.86 km².-Towns and villages:*Imakane...
  
   to form the town of Kitahiyama
  Kitahiyama, Hokkaido
  was a town located in Setana District, Hiyama, Hokkaidō, Japan.On September 1, 2005 Kitahiyama, along with the town of Taisei, from Kudō District, was merged into the expanded town of Setana, formerly from Setana District and now in Kudō District....
  
  )
• September 30, 1956 Bikuni District (美国郡), Hokkaidō (The town of Bikuni merged into the town of Shakotan
  Shakotan, Hokkaido
  is a town located in Shakotan District, Shiribeshi, Hokkaidō, Japan.As of 2008, the town has an estimated population of 2,799 and a density of 12.37 persons per km². The total area is 238.20 km².-External links:* in Japanese...
  
  , Shakotan District
  Shakotan District, Hokkaido
  is a district located in Shiribeshi Subprefecture, Hokkaidō, Japan.As of 2004, the district has an estimated population of 2,947 and a density of 12.37 persons per km². The total area is 238.20 km².-Geography and Climate:...
  
  )
• September 30, 1956 Yana District (八名郡), Aichi (The village of Yamayoshida merged into the town of Hōrai
  Horai, Aichi
  is a former town located in Minamishitara District, Aichi Prefecture, Japan. As of May 1, 2004, the village had an estimated population of 13,565 and a density of 51.45 persons per km². Its total area was 263.66 km².-Geography:...
  
  , Minamishitara District
  Minamishitara District, Aichi
  is a former rural district located in eastern Aichi Prefecture, Japan.As of 2004 , the district had an estimated population of 16,703 and a population density of 43.84 persons per km². Its total area was 381.06 km².-History:...
  
  )
• September 30, 1956 Kawage (河芸郡) and Ano (安濃郡) Districts, Mie (Merged to form Age District
  Age District, Mie
  was a district located in Mie Prefecture. Total population was 41,976 with a total area of 170.60 km².Until the day before the dissolution on December 31, 2005, the district had 3 towns and a village....
  
  )
• September 30, 1956 Ikaruga District (何鹿郡), Kyōto (The village of Saga split and merged into the cities of Ayabe
  Ayabe, Kyoto
  is a city located in Kyoto, Japan., the city has an estimated population of 36,814. The total area is 347.11 km².The city was founded on August 1, 1950....
  
   and Fukuchiyama
  Fukuchiyama, Kyoto
  is a city located in northern Kyoto Prefecture, Japan, on the Yura River. It is about 25 km inland from the Sea of Japan at the southern end of the Fukuchiyama Valley, and is surrounded by mountains to the south, west, and east....
  
  )
• March 21, 1957 Minamimurayama District (南村山郡), Yamagata (The village of Yamamoto merged into the city of Kaminoyama
  Kaminoyama, Yamagata
  is a city located in Yamagata Prefecture, Japan.As of 2008, the city has an estimated population of 34,784 and the density of 144 persons per km². The total area is 240.95 km².The city was founded on October 1, 1954.-Railway stations:...
  
  )
• August 1, 1957 Nemuro District (根室郡), Hokkaidō (The town of Nemuro and the village of Wada merged to form the city of Nemuro
  Nemuro, Hokkaido
  -Transportation:Nearby Nakashibetsu Airport serves Nemuro.-Railways:*Hokkaido Railway Company – Nemuro Main Line**Stations in the city: Nemuro, Higashi-Nemuro, Hanasaki, Nishi-Wada, Kombumori, Ochiishi, Bettoga, Hattaushi, Attoko-Sightseeing:*Cape Nosappu...
  
  )
• March 31, 1958 Minamikatsuragi District (南葛城郡), Nara (The town of Gose and the villages of Kuzu, Taishō, and Katsujō merged and granted city status to form the city of Gose
  Gose, Nara
  is a city in Nara Prefecture, Japan.In 2003 the city had an estimated population of 33,526 and a density of 552.78 persons per km². The total area is 60.65 km².The city was founded on March 31, 1958.-Neighboring municipalities:* Nara Prefecture...
  
  )
• April 1, 1958 Oshiyoro District (忍路郡) (The village of Shioya merged into the city of Otaru
  Otaru, Hokkaido
  is a city and port in Shiribeshi, Hokkaido, Japan, northwest of Sapporo. The city faces the Ishikari Bay, and has long served as the main port of the bay. With its many historical buildings, Otaru is a popular tourist destination...
  
  )
• April 1, 1958 Minamiokitama District (南置賜郡), Yamagata (The village of Nakatsugawa merged into the town of Iide
  Iide, Yamagata
  is a town located in Nishiokitama District, Yamagata, Japan.As of 2010, the town has an estimated population of 8,052 and a density of 24 persons per km². The total area is 329.60 km².-Train stations:...
  
  , Nishiokitama District
  Nishiokitama District, Yamagata
  is a district located in Yamagata, Japan.As of 2003, the district has an estimated population of 35,166 and a density of 28.71 persons per km². The total area is 1,224.89 km².-Towns and villages:*Iide*Oguni*Shirataka...
  
  )
• July 1, 1958 Arima District (有馬郡), Hyōgo (The town of Sanda granted city status to become the city of Sanda
  Sanda, Hyogo
  is a city located in Hyōgo, Japan.As of 2008, the city has an estimated population of 113,585 and the density of 540 persons per km². The total area is 210.22 km².The city was founded on July 1, 1958.-History:...
  
  )
• October 1, 1958 Nakakawachi District (中河内郡), Osaka (The town of Kashiwara granted city status to become the city of Kashiwara
  Kashiwara, Osaka
  is a city located in Osaka, Japan.As of 2010, the city has an estimated population of 74,892 and the density of 2,950 persons per km². The total area is 25.39 km².The city was founded on October 1, 1958.-Location:...
  
  )
• November 3, 1958 Esashi District (江刺郡), Iwate (The town of Esashi granted city status to become the city of Esashi
  Esashi, Iwate
  Esashi was a city located in Iwate Prefecture, Japan.The city was founded on November 3, 1958.On February 20, 2006 Esashi was merged with the city of Mizusawa, the towns of Maesawa and Isawa, and the village of Koromogawa, all from Isawa District, to form the new city of Ōshū...
  
  )
• January 1, 1959 Uchi District (宇智郡), Nara (The village of Minamiuchi merged into the city of Gojō
  Gojo, Nara
  is a city located in Nara Prefecture, Japan.As of May 31, 2011, the city has an estimated population of 35,380 wit 13,864 households and the density of 121.17 persons per km²...
  
  )
• April 1, 1959 Hanasaki District (花咲郡) (The village of Habomai merged into the city of Nemuro
  Nemuro, Hokkaido
  -Transportation:Nearby Nakashibetsu Airport serves Nemuro.-Railways:*Hokkaido Railway Company – Nemuro Main Line**Stations in the city: Nemuro, Higashi-Nemuro, Hanasaki, Nishi-Wada, Kombumori, Ochiishi, Bettoga, Hattaushi, Attoko-Sightseeing:*Cape Nosappu...
  
  )
• April 1, 1959 Nii District (新居郡), Ehime (The town of Sumino merged into the city of Niihama
  Niihama, Ehime
  is a city located in the eastern part of Ehime, Japan. It has the third largest population in Ehime, behind the prefectural capital of Matsuyama and the recently expanded city of Imabari.Niihama was founded on November 3, 1937...
  
  )
• September 30, 1959 Minamikuwada District (南桑田郡), Kyōto (The village of merged into the city of Kameoka
  Kameoka, Kyoto
  is a city located in Kyoto, Japan.As of 2008, the city has an estimated population of 93,323 and a density of 415 persons per km². The total area is 224.90 km². It is known as one of Japan's foggiest cities....
  
  )

1960~1988

• October 1, 1962 Ashikaga District (足利郡), Tochigi (The towns of Mikuriya and Sakanishi merged into the city of Ashikaga
  Ashikaga, Tochigi
  is a city located in Tochigi Prefecture, Japan. Ashikaga is located north of Tokyo.As of April 1, 2011, the city has an estimated population of 153,766, with a household number of 59,219, and a density of 864.73 persons per km²...
  
  )
• April 1, 1963 Inaba District (稲葉郡), Gifu (The towns of Sohara, Naka, Inaha, and Unuma merged to form the city of Kakamigahara
  Kakamigahara, Gifu
  is a city located in the Gifu Prefecture of central Japan. It was founded on 1 April 1963 by the merger of Naka, Sohara, Unuma, and Inaba. Kakamigahara covers a total area of...
  
  )
• May 1, 1965 Asaka District (安積郡), Fukushima (The towns of Asaka, Hiwada, Fukuyama, Atami, and the villages of Mihota, Ouse, Katahira, Kikuta, and Konan merged into the city of Kōriyama
  Koriyama, Fukushima
  is a city in the center of the Nakadōri region of Fukushima Prefecture, Japan. As of May 2011, the city had an estimated population of 336,328. The total area is 757 km²....
  
  )
• October 1, 1966 Iwaki District (石城郡), Fukushima (The towns of Yotsukura, Ogawa, Tōno, the villages of Kawamae, Miwa, Yoshima, Tabito, 2 towns and villages from Futaba District, and the cities of Taira, Jōban, Iwaki, Nakoso, and Uchigō merged to form the city of Iwaki
  Iwaki, Fukushima
  is a city located in the southern part of the Hamadōri coastal region of Fukushima Prefecture, Japan.A designated "core city", Iwaki is also one of the growing number of hiragana cities. Its area is 1,231.35 km², making it the 10th largest city in Japan...
  
  )
• January 1, 1967 Chiba District
  Chiba District, Chiba
  Chiba was a district located in Chiba Prefecture, Japan.The district was dissolved on January 1, 1967 when the town of Yachiyo gained city status.-Chiba District areas:*Chiba-all areas excluding parts of Midori-ku...
  
   (千葉郡), Chiba (The town of Yachiyo gained city status to become the city of Yachiyo
  Yachiyo, Chiba
  is a city located in northern Chiba Prefecture, Japan. As of August 2011, the town had an estimated population of 193,262 and a population density of 3769 persons per km²...
  
  )
• April 1, 1967 Kasai District (加西郡), Hyōgo (The towns of Hōjō, Kasai, and Izumi merged to form the city of Kasai
  Kasai, Hyogo
  is a city located in Hyōgo Prefecture, Japan.As of 2008, the city has an estimated population of 49,496 and the density of 336.31 persons per km². The total area is 150.19 km²....
  
  )
• October 1, 1967 Ichihara District (市原郡), Chiba (The town of Nansō and the village of Kamo merged into the city of Ichihara
  Ichihara, Chiba
  is a city located in Chiba Prefecture, Japan. As of August 2010, the city has an estimated population of 279,080, with a population density of 758 persons per km². The total area of Ichihara was 368.20 km²...
  
  )
• May 1, 1968 Nishichikuma District (西筑摩郡), Nagano (Renamed to Kiso District
  Kiso District, Nagano
  is a district located in Nagano Prefecture, Japan.As of November 1, 2005, the district has an estimated population of 34,759. The total area is 1,546.26 km².Historically, the district was once known as Nishichikuma District until May 1, 1968....
  
   (木曽郡))
• October 1, 1968 Shinobu District (信夫郡), Fukushima (The town of Azuma merged into the city of Fukushima
  Fukushima, Fukushima
  is the capital city of Fukushima Prefecture in the Tōhoku Region of Japan. As of May 2011 the city has an estimated population of 290,064 and an area of 746.43 km².It lies about 250 km north of Tokyo and 80 km south of Sendai.-History:...
  
  )
• January 1, 1969 Abe District (安倍郡), Shizuoka (The villages of Ōkōchi, Umegashima, Tamakawa, Ikawa, Kiyosawa, and Ōkawa merged into the city of Shizuoka
  Shizuoka, Shizuoka
  is the capital city of Shizuoka Prefecture, Japan, and the prefecture's second-largest city in terms of both population and area. It became one of Japan's 19 "designated cities" in 2005.-Geography:...
  
  )
• April 1, 1969 Suki (周吉郡), Ōchi
  Ochi District, Shimane
  is a district located in Shimane, Japan.As of 2003, the district has an estimated population of 27,648 and a density of 30.10 persons per km². The total area is 918.63 km².-Towns and villages:*Kawamoto*Misato*Ōnan-Mergers:...
  
   (穏地郡), Ama (海士郡), and Chibu (知夫郡) Districts, Shimane (Merged to form Oki District
  Oki District, Shimane
  is a district located in Shimane, Japan.As of 2003, the district has an estimated population of 24,500 and a density of 70.79 persons per km². The total area is 346.10 km².The Oki District encompasses the Oki Islands, historically called Oki Province....
  
  )
• August 1, 1970 Yoribetsu District (幌別郡), Hokkaidō (The town of Noboribetsu gained city status to become the city of Noboribetsu
  Noboribetsu, Hokkaido
  is a city in Iburi subprefecture, Hokkaidō, Japan. Part of Shikotsu-Toya National Park, it is southwest of Sapporo, west of Tomakomai and northeast of Hakodate. The name, Noboribetsu, derives from an Ainu word, nupur-pet, which means dark-coloured river....
  
  )
• November 1, 1970 Chitose District (千歳郡), Hokkaidō (The town of Eniwa gained city status to become the city of Eniwa
  Eniwa, Hokkaido
  -External links:...
  
  )
• November 3, 1970 Kitatama District
  Kitatama District, Tokyo
  was a district in the Japanese prefecture of Kanagawa from 1878 to 1893 and then in the prefecture of Tokyo until 1970.In 1878, the Meiji government made the first step to introduce modern administrative divisions on the municipal level: The districts were created from the premodern districts ...
  
   (北多摩郡), Tokyo (The town of Murayama gained city status to become the city of Musashimurayama
  Musashimurayama, Tokyo
  is a city located in Tokyo, Japan.As of 2003, the city has an estimated population of 66,150 and the density of 4,303.84 persons per km². The total area is 15.37 km².The city was founded on November 3, 1970....
  
  )
• December 1, 1970 Higashikasugai District
  Higashikasugai District, Aichi
  Higashikasugai was a district located in Aichi, Japan.Located on the northeastern Owari Region, covering the current cities of Komaki, Kasugai, Seto, and Owariasahi.-See also:*List of dissolved districts of Japan*Aichi Prefecture...
  
   (東春日井郡), Aichi (The town of Asahi gained city status to become the city of Owariasahi
  Owariasahi, Aichi
  is a city located in Aichi Prefecture, Japan.As of June 30, 2011, the city has an estimated population of 81,517 with 32,588 households and a population density of 3,878.07 persons per km². The total area is 21.02 km². The city was part of Higashikasugai District until December 1, 1970, which...
  
  )
• December 1, 1970 Hekikai District
  Hekikai District, Aichi
  was a rural district located in central Aichi, Japan. As a result of various consolidations and mergers of municipalities, the district was incorporated into the five cities of Kariya, Anjō, Takahama, Chiryū and Hekinan in 2005.-History:...
  
   (碧海郡), Aichi (The town of Takahama gained town status to become the city of Takahama
  Takahama, Aichi
  is a city located in central Aichi Prefecture, Japan. As of October 2011, the city had an estimated population of 44,525 and a population density of 3430 persons per km². The total area was 13.00 km².-Neighboring municipalities:*Kariya* Anjō*Hekinan...
  
  , the town of Chiryū gained city status to become the city of Chiryū
  Chiryu, Aichi
  is a city located in central Aichi Prefecture, Japan. As of October 2011, the city had an estimated population of 69,127 and a population density of 4230 persons per km². The total area was 16.34 km².-Neighboring municipalities:*Toyota*Kariya* Anjō...
  
  )
• May 1, 1971 Jōdō District (上道郡), Okayama (The town of Jōdō merged into the city of Okayama
  Okayama, Okayama
  is the capital city of Okayama Prefecture in the Chūgoku region of Japan.The city was founded on June 1, 1889. As of August 2010, the city has an estimated population of 705,224 and a population density of 893 persons per km². The total area is 789.88 km²....
  
  )
• November 1, 1971 Minamitama District (南多摩郡), Tokyo (The town of Tama gained city status to become the city of Tama
  Tama, Tokyo
  is a municipality classified as a city, located in Tokyo, Japan.Its southern half forms part of the Tama New Town project, Japan's largest residential development, constructed in the 1970s....
  
   and the town of Inagi gained city status to become the city of Inagi
  Inagi, Tokyo
  is a city located in Tokyo, Japan.As of 2008, the city has an estimated population of 81,134 and the density of 4,096.33 persons per km². The total area is 17.97 km².The city was founded on November 1, 1971.-History:...
  
  )
• November 3, 1971 Kitakawachi District (北河内郡), Osaka (The town of Katano gained city status to become the city of Katano
  Katano, Osaka
  is a city located in Osaka, Japan.As of 2010, the city has an estimated population of 77,680 and the density of 3,040 persons per km². The total area is 25.55 km².The city was founded on November 3, 1971.-Railways:*Keihan Electric Railway...
  
  )
• April 1, 1972 Soo District
  Soo District, Kagoshima
  is a district located in Kagoshima Prefecture. As of October 1, 2008, the district has an estimated Population of 14,713 and a Density of 146 persons/km². The total area is 100.82 km². The district has one town*Ōsaki-History:...
  
   (囎唹郡), Kagoshima (renamed to Soo District
  Soo District, Kagoshima
  is a district located in Kagoshima Prefecture. As of October 1, 2008, the district has an estimated Population of 14,713 and a Density of 146 persons/km². The total area is 100.82 km². The district has one town*Ōsaki-History:...
  
   (曽於郡))
• March 20, 1973 Asa District (安佐郡), Hiroshima (The towns of Yasufuruichi, Satō, and Kōyō merged into the city of Hiroshima)
• March 1, 1975 Sawara District
  Sawara District, Fukuoka
  Sawara was a district located in Fukuoka Prefecture, Japan.The district was dissolved on March 1, 1975, when the town of Sawara merged into the expanded city of Fukuoka....
  
   (早良郡), Fukuoka (The town of Sawara
  Sawara, Fukuoka
  was a town located in Sawara District, Fukuoka Prefecture. On March 1, 1975, the town merged with the expanded city of Fukuoka.-History:*On August 1, 1956, the villages of Irube, Wakiyama and Uchino were merged to form the town of Sawara....
  
   merged into the city of Fukuoka
  Fukuoka, Fukuoka
  is the capital city of Fukuoka Prefecture and is situated on the northern shore of the island of Kyushu in Japan.Voted number 14 in a 2010 poll of the World's Most Livable Cities, Fukuoka is praised for its green spaces in a metropolitan setting. It is the most populous city in Kyushu, followed by...
  
  )
• February 1, 1979 Innan District (印南郡), Hyōgo (The town of Shikata merged into the city of Kakogawa
  Kakogawa, Hyogo
  is a city located in Hyōgo Prefecture, Japan. The city was founded on June 15, 1950.As of 2010, the city has an estimated population of 268,565 and a population density of 1,940 persons per km². The total area is 138.51 km²...
  
  )
• March 1, 1988 Natori District
  Natori District, Miyagi
  was a district located in Rikuzen Province → Miyagi Prefecture.-History:* Referred to as 奈止里郡 in the Wamyō Ruijushō....
  
   (名取郡), Miyagi (The town of Akiu merged into the city of Sendai
  Sendai, Miyagi
  is the capital city of Miyagi Prefecture, Japan, and the largest city in the Tōhoku Region. In 2005, the city had a population of one million, and was one of Japan's 19 designated cities...
  
  )

1989~2004

• February 1, 1991 Hōtaku District
  Hōtaku District, Kumamoto
  was a district located in Kumamoto Prefecture, Japan.-Former towns and villages:* Akita* Kawachi* Tenmei* Hokubu-Merger:*On February 1, 1991, all towns within the district merged into the expanded city of Kumamoto. Hōtaku District was dissolved as a result of this merger....
  
   (飽託郡), Kumamoto (The towns of Hokubu
  Hokubu, Kumamoto
  was a town located in Hōtaku District, Kumamoto, Japan.On February 1, 1991 Hokubu, along with the towns of Akita, Kawachi and Tenmei, all from Hōtaku District, was merged into the expanded city of Kumamoto and no longer exists as an independent municipality....
  
  , Kawachi
  Kawachi, Kumamoto
  was a town located in Hōtaku District, Kumamoto, Japan.On February 1, 1991 Kawachi, along with the towns of Akita, Tenmei and Hokubu, all from Hōtaku District, was merged into the expanded city of Kumamoto and no longer exists as an independent municipality....
  
  , Akita
  Akita, Kumamoto
  was a town located in Hōtaku District, Kumamoto, Japan.On February 1, 1991 Akita, along with the towns of Kawachi, Tenmei and Hokubu, all from Hōtaku District, was merged into the expanded city of Kumamoto and no longer exists as an independent municipality....
  
  , and Tenmei
  Tenmei, Kumamoto
  was a town located in Hōtaku District, Kumamoto, Japan.On February 1, 1991 Tenmei, along with the towns of Akita, Kawachi and Hokubu, all from Hōtaku District, was merged into the expanded city of Kumamoto and no longer exists as an independent municipality....
  
   merged into the city of Kumamoto
  Kumamoto, Kumamoto
  is the capital city of Kumamoto Prefecture on the island of Kyushu, Japan. Greater Kumamoto has a population of 1,460,000, as of the 2000 census...
  
  )
• April 1, 1991 Kimitsu District
  Kimitsu District, Chiba
  was an administrative district in Chiba Prefecture Japan. The district was dissolved April 1, 1991 when the town of Sodegaura gained city status.-Location:Kimitsy District covered the area of the present day cities of Kisarazu, Futtsu, Kimitsu, and Sodegaura....
  
   (君津郡), Chiba (The town of Sodegaura gained city status to become the city of Sodegaura
  Sodegaura, Chiba
  is a city located in Chiba Prefecture, Japan. As of 2010, the city had an estimated population of 59,916 and a population density of 631 persons per km²...
  
  )
• September 1, 1996 Sapporo District (札幌郡), Hokkaidō (The town of Hiroshima gained city status to become the city of Kitahiroshima
  Kitahiroshima, Hokkaido
  is a city located in Ishikari, Hokkaidō, Japan. Its name, Kitahiroshima-shi, is translated as "North-Hiroshima city", or, more loosely, "city of North-Hiroshima", for 'kita' and 'shi' are the Japanese words for 'north' and 'city', respectively...
  
  )
• April 1, 1999 Taki District (多紀郡), Hyōgo (The towns of Sasayama, Nishiki, Tannan, and Konda merged to form the city of Sasayama
  Sasayama, Hyogo
  is a city located in the central eastern part of Hyōgo Prefecture, Japan.The city was established on April 1, 1999, merging the towns of the former "Taki District" ....
  
  )
• October 1, 2001 Kurita District
  Kurita District, Shiga
  Kurita was a district located in Shiga, Japan.The district was dissolved on October 1, 2001 when Rittō Town change Rittō City. Historically, Kusatsu City belonged to Kurita District, too....
  
   (栗太郡), Shiga (The town of Rittō gained city status to become the city of Rittō
  Ritto, Shiga
  is a city located in Shiga, Japan. It is well-known for Japanese horse racing fans because there is the Japan Racing Association's training center and a famous jockey brothers, Yutaka Take and Koshiro Take, were born in Ritto....
  
  )
• February 3, 2003 Ashina District (芦品郡), Hiroshima (The town of Shinichi merged into the city of Fukuyama
  Fukuyama, Hiroshima
  is a city located on the Ashida River in Hiroshima Prefecture, Japan.As of January 31, 2010, the city has an estimated population of 465,238 and a population density of 898.02 persons per km². The total area is 461.23 km². After Hiroshima City, it is the largest city in Hiroshima Prefecture...
  
  )
• April 1, 2003 Yamagata District
  Yamagata District, Gifu
  was a district located in Gifu, Japan. On April 1, 2003 both towns and the village from the district merged, effectively turning the district into the city of Yamagata....
  
   (山県郡), Gifu (The town of Takatomi, the village of Ijira, and the town of Miyama merged to become the city of Yamagata
  Yamagata, Gifu
  is a city located in Gifu, Japan.-History:The city was established on April 1, 2003, by merger of the towns of Miyama and Takatomi, and the village of Ijira, all from Yamagata District.-External links:*...
  
  )
• April 1, 2003 Ōkawa District
  Okawa District, Kagawa
  was a district in Kagawa Prefecture, Japan. Currently, the area represents now two new cities:*Sanuki, Kagawa - western part that was founded on April 1, 2002, consisting the merger of the towns of Ōkawa, Nagao, Sangawa Shido and Tsuda...
  
   (大川郡), Kagawa (The towns of Hiketa, Shirotori, and Ōchi merged to form the city of Higashikagawa
  Higashikagawa, Kagawa
  is a city located in Kagawa, Japan.As of 2003, the city has an estimated population of 36,988 and a population density of 241.45 persons per km². The total area is 153.19 km²....
  
  )
• April 21, 2003 Tsuno District
  Tsuno District, Yamaguchi
  ' is a former district of Yamaguchi Prefecture. Until April 20, 2003, it consisted of a single town, Kano. On April 21, 2003, Kano was merged with the town of Kumage, from Kumage District, and the cities of Tokuyama, Shinnan'yō, to form the new city of Shūnan and the district was dissolved....
  
   (都濃郡), Yamaguchi (The town of Kano merged with the cities of Tokuyama, Shinnanyō, and the town of Kumage from Kumage District to form the city of Shūnan
  Shunan, Yamaguchi
  is a city located in east central Yamaguchi Prefecture, Japan.The city was founded on April 21, 2003, merging two former cities, Tokuyama and Shinnan'yō and two towns, Kano and Kumage....
  
  )
• March 1, 2004 Sado District
  Sado District, Niigata
  Sado District was a district in Niigata Prefecture, Japan.The district dissolved on March 2004 when the district merged with the city of Ryōtsu to form the city of Sado.It also contained the following towns and villages:*Aikawa *Kanai...
  
   (佐渡郡), Niigata (the towns of Aikawa, Kanai, Sawata, Hatano, Mano, Hamochi and Ogi; and the villages of Niibo, and Akadomari merged with the city of Ryōtsu to form the city of Sado
  Sado, Niigata
  is a city located on Sado Island in Niigata Prefecture, in the Chūbu region of Japan. Since 2004, the city has comprised the entire island, although not all of its total area of 855.26 km2 is urbanized...
  
  )
• March 1, 2004 Gujo District
  Gujo District, Gifu
  was a district located in Gifu Prefecture, Japan. It was dissolved on March 1, 2004 when all seven towns and villages in the district merged, effectively turning the district into the city of Gujō....
  
   (郡上郡), Gifu (The towns of Hachiman, Yamato, Shirotori, and the villages of Takasu, Minami, Meihō, and Wara merged to form the city of Gujō
  Gujo, Gifu
  is a city in Gifu Prefecture, Japan.As of July 2011, the city has an estimated population of 43,960. The total area is 1,030.79 km².-History:...
  
  )
• March 1, 2004 Mashita District
  Mashita District, Gifu
  was a district located in Gifu, Japan. All towns and villages in the district merged to form the city of Gero on March 1, 2004, and the district no longer exists as an independent entity....
  
   (益田郡), Gifu (The towns of Hagiwara, Osaka, Gero, Kanayama, and the village of Maze merged to form the city of Gero
  Gero, Gifu
  is a city in Gifu Prefecture, Japan. The city is famous for its hot springs. The Hida River runs throughout the city.-History:The city was established on March 1, 2004 by the merger of the towns of Gero, Hagiwara, Kanayama and Osaka, and the village of Maze, all from Mashita...
  
  )
• March 1, 2004 Takata District
  Takata District, Hiroshima
  Takata District is a former district located in Hiroshima Prefecture, Japan. On March 1, 2004, it was dissolved upon the formation of the city of Akitakata.-Towns in Takata District:* Kōda* Midori* Mukaihara* Takamiya* Yachiyo* Yoshida...
  
   (高田郡), Hiroshima (The towns of Yoshida, Yachiyo, Midori, Takamiya, Kōda, and Mukaihara merged to form the city of Akitakata
  Akitakata, Hiroshima
  is a city located in north-central Hiroshima Prefecture, Japan.As of April 1, 2011, the city has a population of 31,565, with a household number of 13,223, and an area of 538.17 km²....
  
  )
• March 1, 2004 Iki District (壱岐郡), Nagasaki (The towns of Gōnoura, Katsumoto, Ashibe, and Ishida merged to form the city of Iki
  Iki, Nagasaki
  is a city located at Iki Island in Nagasaki, Japan. It is located approximately 80 kilometers northeast of Fukuoka on mainland Kyūshū. The city consists of five inhabited and 17 uninhabited islands, and its entire area is within the Iki-Tsushima Quasi-National Park...
  
  )
• March 1, 2004 Shimoagata District (下県郡), Nagasaki (The towns of Izuhara, Mitsushima, and Toyotama merged with three towns from Kamiagata District to form the city of Tsushima
  Tsushima, Nagasaki
  is a city governed by Nagasaki Prefecture, Japan. It is the only city of Tsushima Subprefecture and it encompasses all of Tsushima Island Archipelago, which lies in the Tsushima Strait north of Nagasaki on the western side of Kyūshū, the southernmost mainland island of Japan. the city has an...
  
  )
• March 1, 2004 Kamiagata District (上県郡), Nagasaki (The towns of Mine, Kamiagata, and Kamitsushima merged with three towns from Shimoagata District to form the city of Tsushima
  Tsushima, Nagasaki
  is a city governed by Nagasaki Prefecture, Japan. It is the only city of Tsushima Subprefecture and it encompasses all of Tsushima Island Archipelago, which lies in the Tsushima Strait north of Nagasaki on the western side of Kyūshū, the southernmost mainland island of Japan. the city has an...
  
  )
• April 1, 2004 Naka District (中郡), Kyoto (The towns of Mineyama and Ōmiya and other 2 districts 4 towns merged to form the city of Kyōtango
  Kyotango, Kyoto
  is a city in Kyoto Prefecture, Japan. It was formed on April 1, 2004 by the merger of the towns of Mineyama and Omiya, both from Naka District,the towns of Amino, Tango and Yasaka, all from Takeno District, and the town of Kumihama, from Kumano District...
  
  )
• April 1, 2004 Takeno District (竹野郡), Kyoto (The towns of Amino, Takeno, Yasaka and the other 2 districts 3 towns merged to form the city of Kyōtango
  Kyotango, Kyoto
  is a city in Kyoto Prefecture, Japan. It was formed on April 1, 2004 by the merger of the towns of Mineyama and Omiya, both from Naka District,the towns of Amino, Tango and Yasaka, all from Takeno District, and the town of Kumihama, from Kumano District...
  
  )
• April 1, 2004 Kumano District (熊野郡), Kyoto (The town of Kumihama and the other 2 districts 5 towns merged to form the city of Kyōtango
  Kyotango, Kyoto
  is a city in Kyoto Prefecture, Japan. It was formed on April 1, 2004 by the merger of the towns of Mineyama and Omiya, both from Naka District,the towns of Amino, Tango and Yasaka, all from Takeno District, and the town of Kumihama, from Kumano District...
  
  )
• April 1, 2004 Yabu District (養父郡), Hyōgo (The towns of Yōka, Yabu, Ōya, and Sekinomiya merged to form the city of Yabu)
• April 1, 2004 Futami District
  Futami District, Hiroshima
  Futami was a district located in Hiroshima, Japan. on April 1, 2004, all six towns and villages located in this district, along with the town of Kōnu in Kōnu District merged with old Miyoshi to form the new Miyoshi....
  
   (双三郡), Hiroshima (The towns of Kisa, Mirasaka, Miwa, and the villages of Sakugi, Kimita, and Funo merged with the city of Miyoshi and the town of Kōnu from Kōnu District to form the city of Miyoshi
  Miyoshi, Hiroshima
  is a city located in Hiroshima Prefecture, Japan.The city was founded on March 31, 1954.On April 1, 2004, Miyoshi City absorbed the towns of Kisa, Mirasaka and Miwa, the villages of Funo, Kimita and Sakugi, all from Futami District, and the town of Kōnu, from Kōnu District, to form the new city of...
  
  )
• April 1, 2004 Uma District
  Uma District, Ehime
  was a district located in Ehime Prefecture. Due to the mergers, the district dissolved on April 1, 2004.Before the mergers as of 2003, the district had an estimated population of 19,040 with the total area of 165.50 km².-History:...
  
   (宇摩郡), Ehime (The town of Doi, the village of Shingū, and the cities of Iyomishima and Kawanoe merged to form the city of Shikokuchūō
  Shikokuchuo, Ehime
  is a city located in Ehime, Japan.Shikokuchūō is the leading producer of paper and paper products in Japan. It is also a port city and one of Ehime’s major centers of industry....
  
  )
• April 1, 2004 Nishiuwa District
  Higashiuwa District, Ehime
  was a district located in Ehime Prefecture. Due to the mergers the district dissolved on April 1, 2004.-History:* 1878 — The Uwa District was split up by Meiji era land reforms. The Higashiuwa District was thus born...
  
   (東宇和郡), Ehime (The towns of Akehama, Uwa, Nomura, Shirokawa, and Mikame from Nishiuwa District merged to form the city of Seiyo
  Seiyo, Ehime
  is a city located in Ehime, Japan.The city was formed on April 1, 2004 from the merger of the towns of Akehama, Nomura, Shirokawa and Uwa, all from Higashiuwa District, and the town of Mikame, from Nishiuwa District.-Kannon Spring Water:...
  
  )
• October 1, 2004 Shima District
  Shima District, Mie
  Shima was a district located in Mie, Japan.The district was dissolved on October 1, 2004 when all five towns in the district merged to form the city of Shima, effectively turning the district into a city....
  
   (志摩郡), Mie (The towns of Hamajima, Daiō, Ago, Shima, and Isobe merged to form the city of Shima)
• October 1, 2004 Yasu District
  Yasu District, Shiga
  Yasu was a district located in Shiga, Japan. The district was dissolved when Chūzu and Yasu towns merged on Oct. 1, 2004, effectively turning Yasu District into Yasu City....
  
   (野洲郡), Shiga (The towns of Chūzu and Yasu merged to form the city of Yasu)
• October 1, 2004 Kōka District
  Koka District, Shiga
  was a district located in Shiga Prefecture, Japan.As of 2003, the district had an estimated population of 147,928 and a density of 267.90 persons per km²...
  
   (甲賀郡), Shiga (The towns of Ishibe and Kosei merged to form the city of Konan
  Konan, Shiga
  is a city located in the southern part of Shiga, Japan. The city was founded on October 1, 2004 by the merger of the towns of Kōsei and Ishibe, both from Kōka District. The total area is 70.49 km²....
  
  ; The towns of Minakuchi, Tsuchiyama, Kōka, Kōnan, and Shigaraki merged to form the city of Kōka)
• October 1, 2004 Nogi District
  Nogi District, Shimane
  Nogi was a district located in Shimane, Japan.As of 2003, the district had an estimated population of 14,126 and a density of 47.06 persons per km². The total area was 300.19 km².-Merger:...
  
   (能義郡), Shimane (The towns of Hirose and Hakuta merged with the city of Ataki to form the city of Ataki)
• October 1, 2004 Kawakami District
  Kawakami District, Okayama
  Kawakami was a district located in Okayama, Japan.As of 2003, the district had an estimated population of 12,339 and a density of 45.47 persons per km². The total area was 271.34 km²....
  
   (川上郡), Okayama (The town of Nariwa, Kawakami, and Bitchū merged with the city of Takahashi and the town of Ukan from Jōbō District to form the city of Takahashi
  Takahashi, Okayama
  is a city located in Okayama, Japan.As of April 30, 2011, the city has an estimated population of 34,119, with a household number of 13,990 and the density of 62.37 persons per km². The total area is 547.01 km².The city was founded on May 1, 1954....
  
  )
• October 1, 2004 Oe District
  Oe District, Tokushima
  was a district located in Tokushima, Japan.As of 2003, the district had an estimated population of 46,231 and a density of 320.63 persons per km². The total area is 144.19 km²....
  
   (麻植郡), Tokushima (The towns of Kamoshima, Kawashima, Yamakawa, and the village of Misato merged to form the city of Yoshinogawa
  Yoshinogawa, Tokushima
  is a city located in Tokushima, Japan.As of June 1, 2011, the city has an estimated population of 44,726 with 17,573 households and a density of 307.07 persons per km²...
  
  )
• November 1, 2004 Kitaaizu District
  Kitaaizu District, Fukushima
  was a district located in Fukushima, Japan.On November 1, 2004 the village of Kitaaizu was merged into the city of Aizuwakamatsu, at which point the village and district ceased to exist....
  
   (北会津郡), Fukushima (The village of Kitaaizu merged into the city of Aizuwakamatsu
  Aizuwakamatsu, Fukushima
  is a city located in the Aizu region of Fukushima Prefecture, Japan.As of May 2011, the city has an estimated population of 125,341. The total area is 383.03 km².-History:...
  
  )
• November 1, 2004 Taga District
  Taga District, Ibaraki
  Taga was a district located in Ibaraki, Japan. On November 1, 2004 the only town in the district merged into the neighboring city of Hitachi at which point the district ceased to exist....
  
   (多賀郡), Ibaraki (The town of Jūō merged into the city of Hitachi
  Hitachi, Ibaraki
  is a city located on the Pacific Ocean in Ibaraki Prefecture, Japan. Its name could be directly translated as "sunrise", but probably more appropriately adapted to "prosperous wealth" .-Demographics:...
  
  )
• November 1, 2004 Higashitonami District
  Higashitonami District, Toyama
  Higashitonami was a district located in Toyama, Japan.Due to the enforcement of the district government, the district was founded in 1896 when the former Tonami District, occupied the southwestern Etchu Province, split into Nishitonami and Higashitonami Districts.At the time of founding, the...
  
   (東礪波郡), Toyama (The town of Shogawa and the city of Tonami merged to form the city of Tonami
  Tonami, Toyama
  is a city located in Toyama, Japan. The city was founded on April 1, 1954.As of April 30, 2011, the city has an estimated population of 49,470, with 15,438 households and a density of 389.65 persons per km²...
  
  ; the town of Jōhana, the villages of Taira, Kamitaira, Toga, the town of Inami, the village of Inokuchi, and the town of Fukuno merged with the town of Fukumitsu from Nishitonami District to form the city of Nanto
  Nanto, Toyama
  is a city located in Toyama Prefecture, Japan.-History:As of 2000, 8 municipalities that merged into the city had an estimated total population of 60,182 with an average population density of 89.98 persons per km². The total area is 668.86 km²...
  
  )
• November 1, 2004 Ayama District
  Ayama District, Mie
  Ayama was a district located in Mie, Japan.As of 2003, the district had an estimated population of 27,539 and a density of 108.46 persons per km²...
  
   (阿山郡), Mie (The town of Iga, the village of Shimagahara, the town of Ayama, and the village of Ōyamada merged with the city of Ueno and the town of Aoyama in Naga District to form the city of Iga)
• November 1, 2004 Naga District
  Naga District, Mie
  Naga was a district located in Mie, Japan.As of 2003, the district had an estimated population of 11,590 and a density of 106.33 persons per km²...
  
   (名賀郡), Mie (The town of Aoyama and the city of Ueno and 4 towns and villages from Ayama District merged to form the city of Iga)
• November 1, 2004 Hikami District
  Hikami District, Hyogo
  Hikami was a district located in Hyōgo Prefecture, Japan. On November 1, 2004 all six towns in the district merged to form the city of Tamba, thereby dissolving the district....
  
   (氷上郡), Hyōgo (The towns of Kaibara, Hikami, Aogaki, Kasuga, Sannan, and Ichijima merged to form the city of Tamba
  Tamba, Hyogo
  is a city located in Hyōgo, Japan.The city was formed on November 1, 2004 from the merger of all six towns of the former Hikami District: Aogaki, Ichijima, Kaibara, Kasuga, Sannan and Hikami....
  
  )
• November 1, 2004 Ketaka District
  Ketaka District, Tottori
  Ketaka was a district located in Tottori Prefecture, Japan.As of 2003, the district had an estimated population of 22,283 and a density of 143.75 persons per km². The total area was 155.01 km².-Former towns and villages:* Aoya* Ketaka...
  
   (気高郡), Shimane (The towns of Ketaka, Shikano, and Aoya merged into the city of Tottori
  Tottori, Tottori
  is the capital city of Tottori Prefecture in the Chūgoku region of Japan.As of 2006, the city has an estimated population of 200,974 and a density of 262.48 persons per km². The total area is 765.66 km²....
  
  )
• November 1, 2004 Mino District
  Mino District, Shimane
  was a district located in Shimane, Japan until 2004. The population before dissolution is 4,315 with the total area of 432.72 km².-Merger:*On November 1, 2004, the following two towns below merged into the city of Masuda and the district dissolved.**Hikimi...
  
   (美濃郡), Shimane (The towns of Mito and Hikimi merged into the city of Masuda
  Masuda, Shimane
  is a city located in Shimane, Japan.As of September 2010 the city has a population of 51,118 and the density of 69.7 person persons per square km². The total area is 733.16 km²...
  
  )
• November 1, 2004 Ohara District
  Ohara District, Shimane
  Ōhara was a district located in Shimane Prefecture, Japan.In 2003, the district had an estimated population of 30,838 and a density of 124.74 persons per km²...
  
   (大原郡), Shimane (The towns of Daitō, Kamo, and Kisuki merged with three towns from Iishi District to form the city of Unnan
  Unnan, Shimane
  is a city located in Shimane Prefecture, Japan.Unnan was formed on November 1, 2004 from the merger of the towns of Daitō, Kamo and Kisuki, all from Ōhara District, the towns of Mitoya and Kakeya, and the village of Yoshida, all from Iishi District....
  
  )
• November 1, 2004 Oku District
  Oku District, Okayama
  Oku was a district located in Okayama, Japan.As of 2003, the district had an estimated population of 39,365 and a density of 313.64 persons per km². The total area was 125.51 km²....
  
   (邑久郡), Okayama (The towns of Ushimado, Oku, and Nagafune merged to form the city of Setouchi
  Setouchi, Okayama
  is a city located in the southern part of Okayama Prefecture, Japan. As of 2004, the city has a population of 39,377. The total area is 125.51 km²....
  
  )
• November 1, 2004 Shūsō District
  Shuso District, Ehime
  was a district located in Ehime Prefecture, Japan. Due to the mergers, the district dissolved on November 1, 2004.-History:* April, 1897 — Shūfu District and Kuwamura District merged to become the Shūsō District....
  
   (周桑郡), Ehime (The towns of Komatsu and Tanbara and the cities of Saijō and Tōyo merged to form the city of Saijō
  Saijo, Ehime
  is a city located in Ehime, Japan.On November 1, 2004 the old city of Tōyo, and the towns of Komatsu and Tanbara, both from Shūsō District, were merged with Saijō.The city was founded on April 29, 1941.The main city of Saijō is known for natural spring water...
  
  )

2005

• January 1, 2005 Sarashina District
  Sarashina District, Nagano
  Sarashina was a district located in Nagano Prefecture, Japan.As of 2003, the district had an estimated population of 1,467 and a density of 31.99 persons per km²...
  
   (更級郡), Nagano (The village of Ooka merged into the city of Nagano
  Nagano, Nagano
  , the capital city of Nagano Prefecture, is located in the northern part of the prefecture near the confluence of the Chikuma and the Sai rivers, on the main Japanese island of Honshū.As of April 1, 2011 the city has a population of 387,146...
  
  )
• January 1, 2005 Iinan District
  Iinan District, Mie
  Iinan was a district located in Mie Prefecture. The district had an estimated population of 11,235 and the total area was 317.27 km². - Timeline :...
  
   (飯南郡), Mie (The towns of Iinan and Iitaka merged with the city of Matsusaka and two towns from Ichishi District to form the city of Matsusaka
  Matsusaka, Mie
  , sometimes called Matsuzaka, is a city located in central Mie Prefecture, on the island of Honshū, Japan. The city is famous for its beef.-Founding:...
  
  )
• January 1, 2005 Takashima District
  Takashima District, Shiga
  Takashima was a district located in Shiga, Japan.In 2003, the district had an estimated population of 55,348 and a density of 108.24 persons per km²...
  
   (高島郡), Shiga (The towns of Adogawa, Imazu, Shinasahi, Takashima, Makino, and the village of Kutsuki merged to form the city of Takashima)
• January 1, 2005 Onsen District
  Onsen District, Ehime
  was a district located in Ehime Prefecture. Due to the mergers — The district dissolved on January 1, 2005.The district had an estimated population of 40,690 and the total area was 248.73 km² .-History:This district was located in what is currently the center of Matsuyama...
  
   (温泉郡), Ehime (The town of Nakajima merged into the city of Matsuyama
  Matsuyama, Ehime
  is the capital city of Ehime Prefecture on the Shikoku island of Japan. It is located on the northeastern portion of the Dōgo Plain. Its name means "pine mountain." The city was founded on December 15, 1889....
  
  )
• January 1, 2005 Kitaamabe District
  Kitaamabe District, Oita
  ' was a district located in Ōita, Japan.The district had only the town of Saganoseki until December 31, 2004. But on January 1, 2005 Saganoseki, along with the town of Notsuharu, from Ōita District, merged into the expanded city of Ōita, and the district was dissolved.-Municipal Timeline:* July 22,...
  
   (北海部郡), Ōita (The town of Saganoseki
  Saganoseki, Oita
  was a town located in Kitaamabe District, Ōita, Japan.On January 1, 2005 Saganoseki, along with the town of Notsuharu, from Ōita District, was merged with the expanded city of Ōita....
  
   merged into the city of Ōita
  Oita, Oita
  is the capital city of Ōita Prefecture located on the island of Kyushu, Japan.- Demographics and geography :Ōita is the most populous city in Ōita Prefecture...
  
  )
• January 11, 2005 Kawabe District
  Kawabe District, Akita
  Kawabe was a district located in Akita, Japan. , the district had an estimated population of 18,264 and a density of 40.99 persons per km²...
  
   (河辺郡), Akita (The towns of Kawabe and merged into the city of Akita
  Akita, Akita
  is the capital city of Akita Prefecture in the Tohoku region of Japan.As of June 11, 2005, with the merger of the former Kawabe District , the city has an estimated population of 323,310 and density of...
  
  )
• January 11, 2005 Suzuka District
  Suzuka District, Mie
  Suzuka was a district located in Mie, Japan.As of 2003, the district had an estimated population of 7,051 and a density of 88.27 persons per km². The total area was 79.88 km²....
  
   (鈴鹿郡), Mie (The town of Seki and the city of Kameyama merged to form the city of Kameyama
  Kameyama, Mie
  is a city located in Mie Prefecture, Japan.As of 2006, the city has an estimated population of 48,902 and the density of 256.15 persons per km². The total area is 190.91 km².The city was founded on October 1, 1954....
  
  )
• January 11, 2005 Mihara District
  Mihara District, Hyogo
  Mihara was a district located in Hyōgo Prefecture, Japan.As of 2003, the district had an estimated population of 53,638 and a density of 234.05 persons per km²...
  
   (三原郡), Hyōgo (The towns of Midori, Seidan, Mihara, and Nandan merged to form the city of Minamiawaji
  Minamiawaji, Hyogo
  is a city located in the southern part of Awaji Island in Hyōgo Prefecture, Japan.The city was formed on 11 January 2005 from the merger of all four towns of the former Mihara District: Mihara, Midori, Nandan and Seidan...
  
  )
• January 15, 2005 Uto District
  Uto District, Kumamoto
  was a district located in Kumamoto Prefecture, Japan.As of 2003, the district had an estimated population of 19,496 and the density of 252.77 persons per square kilometer. The total area was 77.13 km².-Merger:...
  
   (宇土郡), Kumamoto (The towns of Misumi and Shiranuhi merged with three towns from Shimomashiki District to form the city of Uki
  Uki, Kumamoto
  is a city located in Kumamoto Prefecture, Japan.The city was founded on January 15, 2005, as a result of the merger between the towns of Misumi and Shiranuhi, both from Uto District, and the towns of Matsubase, Ogawa and Toyono, all from Shimomashiki District....
  
  )
• February 1, 2005 Yoshiki District
  Yoshiki District, Gifu
  was a district located in Gifu Prefecture, Japan. The district was dissolved on February 1, 2005 when the town and village in the district merged into the expanded city of Takayama....
  
   (吉城郡), Gifu (The town of Kokufu and the village of Kamitakara merged into the city of Takayama
  Takayama, Gifu
  is a city located in Gifu, Japan. As of July, 2011 the city has an estimated population of 92,369. The total area is .Takayama was settled as far back as the Jōmon period. Takayama is best known for its inhabitants' expertise in carpentry. It is believed carpenters from Takayama worked on the...
  
  )
• February 1, 2005 Numakuma District
  Numakuma District, Hiroshima
  Numakuma was a former district located in Hiroshima Prefecture.The original district areas contained some parts of the present city of Fukuyama...
  
   (沼隈郡), Hiroshima (The town of Numakuma merged into the city of Fukuyama
  Fukuyama, Hiroshima
  is a city located on the Ashida River in Hiroshima Prefecture, Japan.As of January 31, 2010, the city has an estimated population of 465,238 and a population density of 898.02 persons per km². The total area is 461.23 km². After Hiroshima City, it is the largest city in Hiroshima Prefecture...
  
  )
• February 7, 2005 Mugi District
  Mugi District, Gifu
  was a district located in Gifu, Japan. The district was dissolved after it was merged into the nearby city of Seki on February 7, 2005.As of 2003, the district had an estimated population of 17,069 and a density of 46.09 persons per km²...
  
   (武儀郡), Gifu (The towns of Mugi, Mugegawa, and the villages of Horado, Kaminoho, and Itadori merged into the city of Seki
  Seki, Gifu
  is a city located in Gifu, Japan.The city was founded on October 15, 1950.On February 7, 2005, the municipalities of Horado, Itadori, Kaminoho, Mugegawa and Mugi, all part of Mugi District, were merged into the present-day city...
  
  )
• February 13, 2005 Ena District
  Ena District, Gifu
  was a district located in Gifu, Japan.On October 25, 2004 five towns and villages in the district merged with the city of Ena. On February 13, 2005 the remaining six towns and villages in the district merged into the city of Nakatsugawa at which point the district ceased to exist.As of 2003, the...
  
   (恵那郡), Gifu (The town of Sakashita, the villages of Kawaue, Kashimo, the towns of Tsukechi, Fukuoka, and the village of Hirukawa merged into the city of Nakatsugawa
  Nakatsugawa, Gifu
  is a city located in the Tōnō region of Gifu Prefecture, Japan. The city was founded on April 1, 1952.-History:During Japan's Edo period, Nakatsugawa was a post town, known as Nakatsugawa-juku, one of the 69 Stations of the Nakasendō along the Nakasendō. The travel route ran from the Nihonbashi in...
  
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• February 13, 2005 Toyoura District
  Toyoura District, Yamaguchi
  Toyoura was a district located in Yamaguchi Prefecture. The district area covered the city of Shimonoseki and Toyotamae in the city of Mine.As of 2003, the district had an estimated an area of 491.72 km²...
  
   (豊浦郡), Yamaguchi (The towns of Kikukawa, Toyota, Toyoura, and Hōhoku merged with the city of Shimonoseki to form the city of Shimonoseki
  Shimonoseki, Yamaguchi
  is a city located in Yamaguchi Prefecture, Japan. It is at the southwestern tip of Honshū, facing the Tsushima Strait and also Kitakyushu across the Kanmon Straits....
  
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• February 28, 2005 Aso District
  Aso District, Tochigi
  Aso was a district located in Tochigi, Japan.As of 2003, the district had an estimated population of 40,915 and a density of 150.59 persons per km². The total area was 271.70 km².-Merger:...
  
   (安蘇郡), Tochigi (The towns Kuzu and Tanuma merged with the city of Sano to form the city of Sano
  Sano, Tochigi
  is a city located in Tochigi, Japan.The city took its current form on February 28, 2005 when the old city of Sano merged with the towns of Kuzu and Tanuma from Aso District to form the new city of Sano.The city is known for its Outlet Mall and ramen....
  
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• March 1, 2005 Fugeshi
  Fugeshi District, Ishikawa
  was a district located in Ishikawa, Japan.On March 1, 2005 the town of Noto and village of Yanagida from the district merged with the town of Uchiura from Suzu District and the districts merged forming Hōsu District. As of this date, Fugeshi District no longer exists.As of 2003, the district had an...
  
   (鳳至郡) and Suzu
  Suzu District, Ishikawa
  was a district located in Ishikawa, Japan.On March 1, 2005 the town of Uchiura merged with the town of Noto and the village of Yanagida, both from Fugeshi District, to form the new town of Noto, and the districts merged to form the newly-created Hōsu District...
  
   (珠洲郡) Districts, Ishikawa (Merged to form Hōsu District
  Hosu District, Ishikawa
  is a district located in Ishikawa Prefecture, Japan. The current total area is 456.69 km².The district has two towns.*Anamizu*Noto-District History:...
  
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• March 1, 2005 Shitsuki District
  Shitsuki District, Okayama
  Shitsuki was a district located in Okayama, Japan.As of 2003, the district had an estimated population of 5,736 and a density of 71.07 persons per km². The total area was 80.71 km².This district was dissolved on 1 March 2005....
  
   (後月郡), Okayama (The town of Yoshii merged into the city of Ihara)
• March 1, 2005 Ogi District
  Ogi District, Saga
  Ogi was a district located in Saga Prefecture, Japan.As of 2003, the district had an estimated population of 45,910 and a density of 478.98 persons per km²...
  
   (小城郡), Saga (The towns of Ogi, Ashikari, Ushizu, and Mikatsuki merged to form the city of Ogi)
• March 1, 2005 Kitatakaki District
  Kitatakaki District, Nagasaki
  was a district located in Nagasaki, Japan.On January 4, 2005 all towns from this district merged with the City of Isahaya to form the new City of Isahaya. The District of Kitatakaki was dissolved due to this merger....
  
   (北高来郡), Nagasaki (The towns of Iimori, Konagai, Takaki, and Moriyama merged with the town of Tarami from Nishisonogi District and the city of Isahaya to form the city of Isahaya
  Isahaya, Nagasaki
  is a city located in Nagasaki Prefecture, Japan.The city was founded on September 1, 1940. On March 1, 2005, the city expanded through a merger with the surrounding towns of Tarami, Moriyama, Iimori, Takaki and Konagai merged to form the new city of Isahaya...
  
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• March 1, 2005 Shimoge District
  Shimoge District, Oita
  was a district located in Ōita, Japan. On March 1, 2005, the district was dissolved when the four towns that it comprised were absorbed by Nakatsu City....
  
   (下毛郡), Ōita (The towns of Honyabakei, Yabakei, Yamakuni, and the village of Sankō merged into the city of Nakatsu
  Nakatsu, Oita
  is a city located on the northern border of Ōita Prefecture in Kyūshū, Japan. The city is situated on the border with Fukuoka Prefecture.The city was founded on April 20, 1929. As of 2008, the city has an estimated population of 84,179, with a population density of 171 people per km²...
  
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• March 3, 2005 Minamiamabe District
  Minamiamabe District, Oita
  was a district located in Ōita, Japan.As of 2003, the district had an estimated population of 33,239 and the density of 47.09 persons per km². The total area was 705.90 km²....
  
   (南海部郡), Ōita (The towns of Ume, Kamae, Kamiura, Tsurumi, Yayoi, and the villages of Naokawa, Honjo, and Yonoutsu merged with the city of Saiki to form the city of Saiki
  Saiki, Oita
  is a city located in Ōita Prefecture, Japan.As of 2003, the former city had an estimated population of 49,183 and the density of 249.19 persons per km²...
  
  )
• March 19, 2005 Nishikubiki District
  Nishikubiki District, Niigata
  Nishikubiki was a district located in Niigata, Japan. The district was founded in 1878, when the former Kubiki District split into Higashikubiki District, Nakakubiki District, and Nishikubiki District. At the time of founding, the district covered the city of Itoigawa and the Nadachi District in...
  
   (西頸城郡), Niigata (The towns of Nose and Oume and the city of Itoigawa merged to form the city of Itoigawa
  Itoigawa, Niigata
  is a city located in rustic southern Niigata Prefecture, Japan.As of 2008, the city has an estimated population of 48,653 and the density of 65.2 persons per km². The total area is 746.24 km².The city was founded on June 1, 1954...
  
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• March 20, 2005 Ukiha District
  Ukiha District, Fukuoka
  Ukiha was a district located in Fukuoka Prefecture, Japan.-Mergers:* On February 5, 2005, the town of Tanushimaru merged with three other towns into the expanded city of Kurume....
  
   (浮羽郡), Fukuoka (The towns of Ukiha and Yoshii merged to form the city of Ukiha)
• March 22, 2005 Kojima District
  Kojima District, Okayama
  was a district located in Okayama, Japan.As of 2003, the district had an estimated population of 15,872 and a density of 514.32 persons per km². The total area was 30.86 km²....
  
   (児島郡), Okayama (The town of Nadasaki merged into the city of Okayama
  Okayama, Okayama
  is the capital city of Okayama Prefecture in the Chūgoku region of Japan.The city was founded on June 1, 1889. As of August 2010, the city has an estimated population of 705,224 and a population density of 893 persons per km². The total area is 789.88 km²....
  
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• March 22, 2005 Kamo District
  Kamo District, Hiroshima
  Kamo was a district located in Hiroshima Prefecture until 2005. On March 22, 2005 the town of Daiwa merged with the city of Mihara and two towns to form the city of Mihara at which point the district officially ceased to exist...
  
   (賀茂郡), Hiroshima (The town of Yamato merged with the town of Hongo from Toyota District, the town of Kui from Mitsugi District, and the city of Mihara to form the city of Mihara
  Mihara, Hiroshima
  is a city located in Hiroshima, Japan.The city was founded on November 15, 1936.On March 22, 2005 the town of Daiwa, from Kamo District, the town of Kui, from Mitsugi District, and the town of Hongō, from Toyota District, merged with the old city of Mihara to form the new city of Mihara.As of March...
  
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• March 22, 2005 Asa District
  Asa District, Yamaguchi
  Asa was a district located in Yamaguchi Prefecture. The district had an estimated population of 22,781 within a total area of 89.89 km² ....
  
   (厚狭郡), Yamaguchi (The town of San'yō merged with the city of Onoda to form the city of San'yō-Onoda)
• March 22, 2005 Ōtsu District
  Otsu District, Yamaguchi
  Ōtsu was a district located in Yamaguchi Prefecture, Japan. As of 2003, the district had an estimated population of 18,761...
  
   (大津郡), Yamaguchi (The towns of Heki, Yuya, and Misumi merged with the city of Nagato to form the city of Nagato
  Nagato, Yamaguchi
  is a city located in Yamaguchi, Japan.The city was founded on March 31, 1954.Nagato consists of five smaller towns that were absorbed over the past several years. The towns are Fukawa, Senzaki, Yuya, Heki and Misumi...
  
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• March 22, 2005 Hita District
  Hita District, Oita
  was a district located in Ōita, Japan.In 2003, the district had an estimated population of 14,180 and the density of 35.72 persons per km². The total area was 396.98 km²....
  
   (日田郡), Ōita (The villages of Maetsue, Nakatsue, Kamitsue, and the towns of Ōyama and Amagase merged into the city of Hita
  Hita, Oita
  is a city in Ōita Prefecture, Japan, that was founded on December 11, 1940. It is an agricultural and industrial centre that primarily produces lumber, furniture, and pottery...
  
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• March 28, 2005 Higashikatsushika District
  Higashikatsushika District, Chiba
  was a district located in Chiba, Japan until March 27, 2005. On March 28, 2005 the district was dissolved when the town of Shōnan merged into the city of Kashiwa.-Area:...
  
   (東葛飾郡), Chiba (The town of Shonan merged into the city of Kashiwa
  Kashiwa, Chiba
  is a city located in northern Chiba Prefecture, Japan. As of February 2011, the city had an estimated population of 404,820 and a population density of 3520 persons per km²...
  
  )
• March 28, 2005 Kaizu District (海津郡), Gifu (The towns of Hirata, Nanno, and Kaizu merged to form the city of Kaizu)
• March 28, 2005 Mitsugi District
  Mitsugi District, Hiroshima
  Mitsugi was a district located in Hiroshima Prefecture, Japan.As of 2003, the district had an estimated population of 29,682 and a density of 181.49 persons per km²...
  
   (御調郡), Hiroshima (The town of Mitsugi and Mukaishima merged into the city of Onomichi
  Onomichi, Hiroshima
  is a city located in Hiroshima Prefecture, Japan, facing the Inland Sea.As of January 1, 2008, the city has an estimated population of 148,085 and a population density of 520 persons per km². The total area is 284.85 km²...
  
  )
• March 28, 2005 Munakata District
  Munakata District, Fukuoka
  Munakata was a district located in Fukuoka Prefecture, Japan.The district was dissolved on March 28, 2005, when the village of Ōshima merged into the city of Munakata.-Description:The cities once part of the district* Munakata* Fukutsu...
  
   (宗像郡), Fukuoka (The village of Ōshima merged into the city of Munakata
  Munakata, Fukuoka
  is a city located in Fukuoka Prefecture, in the north Chikuzen region of the prefecture.As of April 1, 2008, the city has an estimated population of 94,660 and the density of 791 persons per km 2...
  
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• March 31, 2005 Atetsu District
  Atetsu District, Okayama
  Atetsu was a district located in Okayama, Japan.As of 2003, the district had an estimated population of 13,546 and a density of 30.70 persons per km². The total area was 441.28 km².This district was dissolved on 31 March 2005....
  
   (阿哲郡), Okayama (The towns of Ōsa, Shingō, Tetta, and Tessei merged with the city of Niimi to form the city of Niimi
  Niimi, Okayama
  is a city located in Okayama, Japan.As of March 31, 2011, the city has an estimated population of 34,035 , 13,077 households and the density of 42.90 persons per km²...
  
  )
• March 31, 2005 Jōbō District
  Jobo District, Okayama
  was a district located in Okayama, Japan.As of 2003, the district had an estimated population of 16,967 and a density of 69.13 persons per km². The total area was 245.45 km².This district was dissolved on 31 March 2005.-Towns and villages:...
  
   (上房郡), Okayama (The town of Hokubō merged with 8 towns and villages from Maniwa District to form the city of Maniwa
  Maniwa, Okayama
  is a city in Okayama Prefecture, Japan.On 31 March 2005, the town of Hokubō ; the towns of Katsuyama, Ochiai, Yubara, and Kuse and the villages of Mikamo, Kawakami, Yatsuka, and Chūka merged to form the new city of Maniwa.On September 1, 2011, Maniwa had an area of 828.43 km², the largest area of...
  
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• March 31, 2005 Kōnu District (甲奴郡), Hiroshima (The town of Sōryō merged with 5 towns from Hiba District and the city of Shōbara to form the city of Shōbara
  Shobara, Hiroshima
  is a city located in northeastern corner of Hiroshima, Japan. The city was founded on March 31, 1954.On March 31, 2005 the towns of Hiwa, Kuchiwa, Saijō, Takano, and Tōjō, all from Hiba District , and the town of Sōryō, from Kōnu District , were merged into the expanded city of Shōbara.The entire...
  
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• March 31, 2005 Hiba District
  Hiba District, Hiroshima
  was a district located in Hiroshima, Japan.As of 2003, the district had an estimated population of 21,448 and a density of 23.00 persons per km². The total area was 932.44 km².-Former towns and villages:...
  
   (比婆郡), Hiroshima (The towns of Saijō, Tōjō, Kuchiwa, Takano and Hiwa merged with the town of Sōryō from Kōnu District and the city of Shōbara to form the city of Shōbara)
• March 31, 2005 Usa District
  Usa District, Oita
  was a district located in Ōita, Japan.As of 2003, the district had an estimated population of 12,739 and the density of 48.85 persons per km². The total area was 260.79 km².-District Timeline:...
  
   (宇佐郡), Ōita (The towns of Innai and Ajimu merged with the city of Usa to form the city of Usa
  Usa, Oita
  ' is a city located in Ōita Prefecture, Japan. Usa is famous for being the location of the Usa Shrine, built in 725, the head shrine of all of Hachiman shrines in Japan.Usa is made up of three areas.*Usa, the area surrounding the Usa Shrine...
  
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• March 31, 2005 Ōno District
  Ono District, Oita
  ' was a district located in Ōita Prefecture, Japan.As of January 1, 2005 the district had 6 towns and 2 villages.* Asaji* Chitose* Inukai* Kiyokawa* Mie* Notsu* Ogata* Ōno...
  
   (大野郡), Ōita (The town of Mie, The village of Kiyokawa, the towns of Ogata, Asaji, Ōno, the village of Chitose, and the town of Inukai merged to form the city of Bungo-ōno
  Bungo-ono, Oita
  is a city located in Ōita Prefecture, Japan.The city was founded on March 31, 2005 as a result of the merger between the municipalities of Asaji, Chitose, Inukai, Kiyokawa, Mie, Ogata and Ōno ....
  
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• April 1, 2005 Kurihara District
  Kurihara District, Miyagi
  Kurihara District was a district in Japan belonging to Mutsu Province or the Miyagi Prefecture. Established in the 8th century AD as Korehari or Koreharu District and abolished in 2005, the territory is identical to the city of Kurihara today....
  
   (栗原郡), Miyagi (The towns of Ichihasama, Uguisuzawa, Kannari, Kurikoma, Shiwahime, Semine, Takashimizu, Tsukidate, Wakayanagi, and the village of Hanayama merged to form the city of Kurihara
  Kurihara, Miyagi
  is a city located in Miyagi Prefecture, Japan. As of 2008, the city has an estimated population of 77,012 and a population density of 95.7 persons per km². The total area is 804.93 km². Previously a district consisting of nine towns and one village, on April 1, 2005, the towns and village...
  
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• April 1, 2005 Tome District (登米郡), Miyagi (The towns of Ishikoshi, Towa, Toyosato, Toyoma, Nakada, Hasama, Minamikata, and Yoneyama merged with the town ot Tsuyama from Motoyoshi District to form the city of Tome
  Tome, Miyagi
  is a city located in Miyagi Prefecture, Japan.Previously a district consisting of eight towns, on April 1, 2005, they, along with the town of Tsuyama formerly of Motoyoshi District, merged to form a new city. As of 2010, Tome city had an estimated population of 84,070 and a population density of...
  
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• April 1, 2005 Monou District
  Monou District, Miyagi
  Monou was a district located in Miyagi, Japan.As of 2005, this district no longer exists.* On April 1, 2005 the towns of Yamoto and Naruse merged to form the city of Higashimatsushima....
  
   (桃生郡), Miyagi (The towns of Yamoto and Naruse merged to form the city of Higashimatsushima
  Higashimatsushima, Miyagi
  is a city located in Miyagi Prefecture, Japan.It was created on April 1, 2005, when the towns of Naruse and Yamoto, both formally of Monou District, merged to form the new city....
  
  ; the towns of Kahoku, Ogatsu, Kanan, Monou, and Kitakami merged with the town of Oshika from Oshika District and the city of Ishinomaki to form the city of Ishinomaki
  Ishinomaki, Miyagi
  is a city located in Miyagi Prefecture, Japan.As of January 1, 2010, the city had an estimated population of 164,294 and a population density of 295.83 persons per km²...
  
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• April 1, 2005 Koshi District
  Koshi District, Niigata
  Koshi was a district located in Niigata, Japan.As of 2003, the district had an estimated population of 2,035 and a density of 51.09 persons per km². The total area is 39.83 km².-Merger and dissolution:...
  
   (古志郡), Niigata (The village of Yamakoshi merged into the city of Nagaoka
  Nagaoka, Niigata
  is a city located in the central part of Niigata Prefecture, Japan. It is the second largest city in the prefecture, behind the capital city of Niigata...
  
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• April 1, 2005 Higashikubiki District
  Higashikubiki District, Niigata
  Higashikubiki was a district located in Niigata, Japan. The district was founded when the former Kubiki District split into Higashikubiki District, Nakakubiki District, and Nishikubiki District...
  
   (東頸城郡), Niigata (The towns of Matsudai and Matsunoyama merged with the city of Tōkamachi and 2 towns and villages from Nakauonuma District to form the city of Tōkamachi
  Tokamachi, Niigata
  is a city located in Niigata Prefecture, Japan.As of November 31, 2010, the new city has an estimated population of 60,164. The total area of the new city is 589.92 km², including the post-Creation undefined boundary areas....
  
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• April 1, 2005 Nakakubiki District
  Nakakubiki District, Niigata
  Nakakubiki was a district located in Niigata, Japan. The district was founded in 1878, when the former Kubiki District split into Higashikubiki District, Nakakubiki District, and Nishikubiki District...
  
   (中頸城郡), Niigata (The town of Myōkōkōgen and the village of Myōkō merged into the city of Arai to become the city of Myōkō)
• April 1, 2005 Kaminiikawa District
  Kaminiikawa District, Toyama
  Kaminiikawa was a district located in Toyama, Japan.As of 2003, the district had an estimated population of 34,491 and a density of 53.31 persons per km²...
  
   (上新川郡), Toyama (The towns of Ōsawano and Ōyama merged with 4 towns and villages from Nei District and the city of Toyama to form the city of Toyama
  Toyama, Toyama
  is the capital city of Toyama Prefecture, Japan, located on the coast of the Sea of Japan in the Chūbu region on central Honshū, about 200 km north of the city of Nagoya and 300 km northwest of Tokyo....
  
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• April 1, 2005 Nei District
  Nei District, Toyama
  was a district located in Toyama, Japan.As of 2003, the district has an estimated population of 61,601 and a density of 159.56 persons per km². The total area is 386.06 km².-Towns and villages:* Fuchū* Hosoiri* Yamada* Yatsuo-History:...
  
   (婦負郡), Toyama (The towns of Yatsuo, Fuchu, and the villages of Yamada and Hosoiri merged with two towns from Kaminiikawa District and the city of Toyama to form the city of Toyama)
• April 1, 2005 Ogasa District
  Ogasa District, Shizuoka
  was a rural district located in western Shizuoka, Japan.As of the end of 2003 , the district had an estimated population of 82,248 and a population density of 472.47 persons per km². Its total area was 174.08 km².-History:Ogasa District was on April 1, 1896 through the merger of former and...
  
   (小笠郡), Shizuoka (The towns of Ōsuga and Daitō merged with the city of Kakegawa to form the city of Kakegawa
  Kakegawa, Shizuoka
  is a city in western Shizuoka Prefecture, Japan. As of 2010, the city had an estimated population of 117,858 and a population density of 444 persons per km². The total area was 265.63 km².-Geography:...
  
  )
• April 1, 2005 Haguri District
  Haguri District, Aichi
  Haguri was a district located in Aichi Prefecture, Japan.As of 2003-final population count, the district had an estimated population of 31,684 and a density of 3,331.65 persons per km²...
  
   (葉栗郡), Aichi (The town of Kisogawa merged into the city of Ichinomiya
  Ichinomiya, Aichi
  is a city located in Aichi, Japan. The city is often called Owari-Ichinomiya to avoid confusion with another Ichinomiya . The pre-expansion city was once part of now-defunct Nakashima District until September 1, 1921....
  
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• April 1, 2005 Nakashima District
  Nakashima District, Aichi
  was a district located in Aichi Prefecture, Japan, which existed until 2005.As of 2003, the district had an estimated population of 36,239 and a population density of 1,170.89 persons per km². The total area was 30.95 km².-Merger:...
  
   (中島郡), Aichi (The towns of Sofue and Heiwa merged into the city of Inazawa
  Inazawa, Aichi
  is a city located in Aichi, Japan. The city was founded on November 1, 1958. As of February 1, 2010 the city has an estimated population of 136,904 and a population density of 1,730 persons per km²...
  
  )
• April 1, 2005 Higashikamo District
  Higashikamo District, Aichi
  was a former rural district located in Nishimikawa Region in central Aichi, Japan. The entire district is now part of the city of Toyota.-History:Kamo District was one of the ancient districts of Shinano province, but was transferred to Mikawa province during the Sengoku period...
  
   (東加茂郡), Aichi (The town of Asuke, the village of Shimoyama, and the towns of Asahi and Inabu merged into the city of Toyota
  Toyota, Aichi
  is a city located in the Mikawa region of Aichi Prefecture, Japan, east of Nagoya.Toyota's main plant, the Tsutsumi plant, is located here. The longstanding ties between the Toyota Motor Corporation and the town of Toyota-shi, formerly known as Koromo, gave the town its current...
  
  )
• April 1, 2005 Asago District
  Asago District, Hyogo
  Asago District was a district located in Hyōgo Prefecture, Japan. As of March 31, 2005, the district had an estimated population of 35,762. The total area is 402.98 km²....
  
   (朝来郡), Hyōgo (The towns of Ikuno, Wadayama, Santo, and Asago merged to form the city of Asago
  Asago, Hyogo
  Asago was a town located in Hyōgo Prefecture, Japan. The town was founded on March 31, 1954 from the merger of the former villages of Yamaguchi and Nakagawa....
  
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• April 1, 2005 Kinosaki District
  Kinosaki District, Hyogo
  Kinosaki was a district located in Hyōgo Prefecture, Japan. As of April 1, 2005, the district was dissolved when all of its towns merged into other jurisdictions....
  
   (城崎郡), Hyōgo (The towns of Kinosaki, Takeno, and Hidaka merged with 2 towns from Izushi District and the city of Toyooka to form the city of Toyooka
  Toyooka, Hyogo
  is a city located in the northern part of Hyōgo, Japan.As of 2008, the city has an estimated population of 90,443 and a density of 125 persons per km²...
  
  ; the town of Kasumi merged with the towns of Muraoka and Mikata from Mikata District to form the town of Kami
  Kami, Hyogo (Mikata)
  is a town located in Mikata District, Hyōgo, Japan. The town was formed on April 1, 2005 from the merger of the former town of Kasumi, from Kinosaki District, and the towns of Mikata and Muraoka, both from Mikata District....
  
   in Mikata District
  Mikata District, Hyogo
  Mikata is a district located in Hyōgo, Japan.As of the April 1, 2005 merger , the district has an estimated population of 40,084 and a density of 66 persons per km²...
  
  )
• April 1, 2005 Izushi District
  Izushi District, Hyogo
  Izushi was a district located in Hyōgo, Japan. On April 1, 2005 the two towns in the district merged into the expanded city of Toyooka dissolving the district....
  
   (出石郡), Hyōgo (The towns of Izushi and Tantō merged with 3 towns from Kinosaki District and the city of Toyooka to form the city of Toyooka)
• April 1, 2005 Soekami District
  Soekami District, Nara
  Soekami was a district located in Nara Prefecture, Japan.As of 2003, the district had an estimated population of 1,913 and a density of 89.60 persons per km². The total area was 21.35 km².- Merger :...
  
   (添上郡), Nara (The village of Tsukigase merged into the city of Nara
  Nara, Nara
  is the capital city of Nara Prefecture in the Kansai region of Japan. The city occupies the northern part of Nara Prefecture, directly bordering Kyoto Prefecture...
  
  )
• April 1, 2005 Awa District
  Awa District, Tokushima
  Awa is a district located in Tokushima, Japan.As of 2003, the district has an estimated population of 24,959 and a density of 206.20 persons per km². The total area is 121.04 km².-Merger:...
  
   (阿波郡), Tokushima (The towns of Awa and Ichiba merged with 2 towns from Itano District to form the city of Awa
  Awa, Tokushima
  is a city located in Awa District, Tokushima Prefecture, Japan.Awa City was founded on April 1, 2005, when the old town of Awa absorbed the town of Ichiba, also from Awa District, and the towns of Donari and Yoshino, all from Itano District. It is located in the former Awa Province .As of 2005, the...
  
  )
• April 1, 2005 Naoiri District
  Naoiri District, Oita
  was a district located in Ōita, Japan.As of 2003, the district had an estimated population of 10,956 and the density of 39.58 persons per km². The total area was 276.84 km².-District Timeline:...
  
   (直入郡), Ōita (The towns of Ogi, Kujū, and Naoiri merged with the city of Taketa to form the city of Taketa
  Taketa, Oita
  is a city located in Ōita Prefecture, Japan.As of 2003, the city has an estimated population of 16,807 and a density of 83.69 persons per km². The total area is 200.83 km²....
  
  )
• July 1, 2005 Kaijo District
  Kaijo District, Chiba
  Kaijō was a district located in Chiba, Japan.As of 2003, the district had an estimated population of 21,982 and a density of 469.10 persons per km²...
  
   (海上郡), Chiba (The towns of Iioka and Unakami merged with the town of Hikata from Katori District and the city of Asahi to form the city of Asahi
  Asahi, Chiba
  is a city located in northern Chiba, Japan. As of February 2011, the city had an estimated population of 69,000 and a population density of 531 persons per km². The total area was 129.91 km².-Geography:...
  
  )
• July 1, 2005 Inasa District
  Inasa District, Shizuoka
  was a rural district located in western Shizuoka, Japan. Over the course of several mergers and consolidations, all of the district has been absorbed into the city of Hamamatsu, and was abolished in 2005....
  
   (引佐郡), Shizuoka (The towns of Inasa, Hosoe, and Mikkabi merged into the city of Hamamatsu
  Hamamatsu, Shizuoka
  is a city located in western Shizuoka Prefecture, Japan. On July 1, 2005, the city merged with 11 surrounding cities and towns. It became a city designated by government ordinance on April 1, 2007.- History :...
  
  )
• July 1, 2005 Iwata District
  Iwata District, Shizuoka
  Iwata was a district located in Shizuoka, Japan.As of 2003, the district had an estimated population of 109,260 and a density of 171.17 persons per km²...
  
   (磐田郡), Shizuoka (The towns of Sakuma, Misakubo, and the village of Tatsuyama merged into the city of Hamamatsu)
• August 1, 2005 Kibi District
  Kibi District, Okayama
  Kibi is a district located in Okayama, Japan.As of 2003, the district has an estimated population of 22,927 and a density of 520.12 persons per km². The total area is 44.08 km²....
  
   (吉備郡), Okayama (The town of Mabi merged into the city of Kurashiki
  Kurashiki, Okayama
  is a historic city located to the west of Okayama Prefecture, Japan, sitting on the Takahashi River, on the coast of the Inland Sea.As of April 2010, the city has a population of 473,392. The total area is .-History:...
  
  )
• September 2, 2005 Namegata District
  Namegata District, Ibaraki
  was a district located in Ibaraki, Japan.As of 2003, the district has an estimated population of 40,930 and a density of 246.08 persons per km². The total area is 166.33 km²....
  
   (行方郡), Ibaraki (The towns of Asou, Kitaura, and Tamatsukuri merged to form the city of Namegata
  Namegata, Ibaraki
  is a city located in Ibaraki, Japan. The city was formed on September 2, 2005 from the merger of the towns of Asō, Kitaura and Tamatsukuri.As of April 1, 2011 population data, the city has an estimated population of 38,182, with a household number of 11,721 and the density of 229.56 persons per...
  
  )
• October 1, 2005 Atsuta District
  Atsuta District, Hokkaido
  was a district located in Ishikari Subprefecture, Hokkaidō, Japan.As of 2004, the district had an estimated population of 2,592 and a density of 8.85 persons per km². The total area was 292.84 km².-Mergers:...
  
   (厚田郡), Hokkaidō (The village of Atsuta merged into the city of Ishikari
  Ishikari, Hokkaido
  is a city located in Ishikari Subprefecture, Hokkaidō, Japan.The city was born out of Ishikari Town on September 1, 1996.On October 1, 2005, the village of Atsuta, from Atsuta District, and the village of Hamamasu, from Hamamasu District, merged into Ishikari.As of March 1, 2008, the city has an...
  
  )
• October 1, 2005 Hamamasu District
  Hamamasu District, Hokkaido
  Hamamasu was a district of Ishikari Subprefecture, Hokkaidō, Japan.In 2004 the district had an estimated population of 2,179 and a density of 7.00 persons per km². The total area was 311.16 km².-Merger:...
  
   (浜益郡), Hokkaidō (The village of Hamamasu merged into the city of Ishikari
  Ishikari, Hokkaido
  is a city located in Ishikari Subprefecture, Hokkaidō, Japan.The city was born out of Ishikari Town on September 1, 1996.On October 1, 2005, the village of Atsuta, from Atsuta District, and the village of Hamamasu, from Hamamasu District, merged into Ishikari.As of March 1, 2008, the city has an...
  
  )
• October 1, 2005 Hiraka District
  Hiraka District, Akita
  Hiraka was a district located in Akita Prefecture, Japan.In 2003, the district had an estimated population of 65,910 and a density of 113.05 persons per km²...
  
   (平鹿郡), Akita (The towns of Masuda, Hiraka, Omonogawa, Ōmori, Jumonji, and the villages of Sannai and Taiyū merged with the city of Yokote to form the city of Yokote
  Yokote, Akita
  is a city located in Akita in the Tōhoku region of Japan.As of October 1, 2011, the city has an estimated population of 96,955, with a household number of 34,314 and the density of 140 persons per km²...
  
  )
• October 1, 2005 Yuri District
  Yuri District, Akita
  Yuri was a district located in Akita, Japan.There were three towns left before the district dissolved.* Kisakata* Konoura* NikahoOn October 1, 2005, all towns merged to form the city of Nikaho which will dissolve Yuri District....
  
   (由利郡), Akita (The towns of Nikaho, Konoura, and Kisakata merged to form the city of Nikaho)
• October 1, 2005 Nishitagawa District
  Nishitagawa District, Yamagata
  Nishitagawa was a district located in Yamagata, Japan.As of 2003, the district has an estimated population of 9,921 and a density of 38.84 persons per km². The total area is 255.40 km²....
  
   (西田川郡), Yamagata (The town of Atsumi merged with 4 towns and villages from Higashitagawa District and the city of Tsuruoka to form the city of Tsuruoka
  Tsuruoka, Yamagata
  is a city located in the Shonai region of Yamagata Prefecture, Japan.Tsuruoka is the second largest city in Yamagata Prefecture after Yamagata City...
  
  )
• October 1, 2005 Makabe District
  Makabe District, Ibaraki
  Makabe was a district located in Ibaraki, Japan.As of the Chikusei merger, but with 2003 population data, the district had an estimated population of 26,699 and a density of 288 persons per km²...
  
   (真壁郡), Ibaraki (The town of Makabe and the village of Yamato merged with the town of Iwase from Nishiibaraki District to form the city of Sakuragawa
  Sakuragawa, Ibaraki
  is a city in Ibaraki, Japan. It was formed on 1 October 2005. It is composed of Iwase-cho in the north, Yamato-mura in the center, and Makabe-cho in the south...
  
  )
• October 1, 2005 Enuma District
  Enuma District, Ishikawa
  was a district located in Ishikawa, Japan.As of 2003, the district had an estimated population of 9,801 and a density of 63.48 persons per square kilometer. The total area was 154.39 km²....
  
   (江沼郡), Ishikawa (The town of Yamanaka merged with the city of Kaga to form the city of Kaga
  Kaga, Ishikawa
  is a city located in the southwest of Ishikawa Prefecture, Japan.Created as an old temple town, the city was greatly developed by the Maeda clan in the early Edo period...
  
  )
• October 1, 2005 Minamiazumi District
  Minamiazumi District, Nagano
  Minamiazumi was a district located in Nagano Prefecture, Japan.As of 2003, the district had an estimated population of 99,785 and a density of 117.22 persons per km²...
  
   (南安曇郡), Nagano (The towns of Toyoshina and Hotaka, and the villages of Misato and Horigane merged with the towns of Akashina from Higashichikuma District to form the city of Azumino
  Azumino, Nagano
  is a city located in Nagano Prefecture, Japan.The city was founded on October 1, 2005, when the town of Akashina, from Higashichikuma District, and the towns of Hotaka and Toyoshina, and the villages of Horigane and Misato, from Minamiazumi District, merged to form a new city...
  
  )
• October 1, 2005 Minamishitara District
  Minamishitara District, Aichi
  is a former rural district located in eastern Aichi Prefecture, Japan.As of 2004 , the district had an estimated population of 16,703 and a population density of 43.84 persons per km². Its total area was 381.06 km².-History:...
  
   (南設楽郡), Aichi (The town of Horai and Tsukude merged with the city of Shinshiro to form the city of Shinshiro
  Shinshiro, Aichi
  is a city located in Aichi Prefecture, Japan. As of February 2011, the city had an estimated population of 49,731 and the population density of 99.7 persons per km². The total area was 499.00 km².-Geography:...
  
  )
• October 1, 2005 Atsumi District
  Atsumi District, Aichi
  was a rural district located in southern Aichi, Japan, located on the Atsumi Peninsula in Mikawa Bay. As a result of various consolidations and mergers of municipalities, the district was incorporated into the cities of Toyohashi and Tahara in 2005....
  
   (渥美郡), Aichi (The town of Atsumi merged into the city of Tahara
  Tahara, Aichi
  is a city located in Aichi Prefecture, Japan. As of August 2011, the city had an estimated population of 63,886 and a population density of 338 persons per km². The total area was 188.81 km².-Geography:...
  
  )
• October 1, 2005 Sakata District
  Sakata District, Shiga
  Sakata was a district located in Shiga, Japan. The district is currently dissolved.As of 2003, the district has an estimated population of 41,126 and a density of 184.34 persons per km². The total area is 223.10 km²....
  
   (坂田郡), Shiga (The town of Ōmi merged into the city of Maibara
  Maibara, Shiga
  is a city located in Shiga Prefecture, Japan.As of August 1, 2006, the city has an estimated population of 42,154. The total area is 223.1 km².- History :...
  
  )
• October 1, 2005 Naka District
  Naka District, Shimane
  Naka was a district located in Shimane, Japan.As of 2003, the district had an estimated population of 17,618 and a density of 33.44 persons per km²...
  
   (那賀郡), Shimane (The towns of Kanagi, Asahi, the village of Yasaka, and the town of Misumi merged with the city of Hamada to form the city of Hamada
  Hamada, Shimane
  is a city located in Shimane, Japan. It is the third largest city in the prefecture and is located at the south-western end of the prefecture. It is a coastal city on the Sea of Japan and possesses beautiful white-sand beaches, which make the city a popular destination for local tourists in the...
  
  )
• October 1, 2005 Nima District
  Nima District, Shimane
  Nima was a district located in Shimane, Japan.As of 2003, the district had an estimated population of 8,682 and a density of 83.93 persons per km². The total area was 103.44 km².-Merger:...
  
   (邇摩郡), Shimane (The towns of Yunotsu and Nima merged with the city of Ōda to form the city of Ōda
  Oda, Shimane
  is a city located in Shimane, Japan.As of April 1, 2008, the city has an estimated population of 40,614 and the density of 90.2 persons per km². The total area is 436.11 km²...
  
  )
• October 1, 2005 Saba District
  Saba District, Yamaguchi
  Saba was a district located in Yamaguchi Prefecture, Japan.As of 2003, the district had an estimated population of 7,946 and a density of 27.37 persons per km²...
  
   (佐波郡), Yamaguchi (The town of Tokuji merged with three towns from Yoshiki District and the city of Yamaguchi to form the city of Yamaguchi
  Yamaguchi, Yamaguchi
  is the capital city of Yamaguchi Prefecture, Japan.As of February 1, 2010, the city has an estimated population of 198,971 and a population density of 194.44 persons per km²...
  
  )
• October 1, 2005 Yoshiki District
  Yoshiki District, Yamaguchi
  Yoshiki was a district located in Yamaguchi Prefecture. The district had a total estimated population of 39,900 and the total area was 82.98 km²...
  
   (吉敷郡), Yamaguchi (The towns of Aio, Ogori, and Ajisu merged with the town of Tokuji from Saba District and the city of Yamaguchi to form the city of Yamaguchi)
• October 1, 2005 Nishikunisaki District
  Nishikunisaki District, Oita
  was a district located in Ōita, Japan.The district was dissolved on October 1, 2005.-District Timeline:* July 22, 1878 - Nishikunisaki District was founded after Kunisaki District broke off into Nishikunisaki and Higashikunisaki Districts....
  
   (西国東郡), Ōita (The village of Ōta merged with the town of Yamaga from Hayami District and the city of Kitsuki to form the city of Kitsuki
  Kitsuki, Oita
  is a city located in Ōita Prefecture, Japan.As of 2003, the city has an estimated population of 22,955 and the density of 254.43 persons per km². The total area is 90.22 km².The city was founded on April 1, 1955.-External links:*...
  
  )
• October 1, 2005 Ōita District
  Oita District, Oita
  was a district located in Ōita, Japan.As of 2003, the district had an estimated population of 40,723 and density of 99.35 persons per km². The total area was 409.90 km².-Dissolution:As of January 1, 2005 the district had 4 towns.* Hasama* Notsuharu...
  
   (大分郡), Ōita (The towns of Yufuin, Shōnai, and Hasama merged to form the city of Yufu
  Yufu, Oita
  is a city located in Ōita Prefecture, Japan.The city was founded on October 1, 2005 as a result of the merger between the towns of Hasama, Shōnai and Yufuin, all from Ōita District....
  
  )
• October 11, 2005 Kashima District
  Kashima District, Ibaraki
  Kashima was a former district located in Ibaraki, Japan.As of 2003, the district had an estimated population of 141,935 and a density of 404.21 persons per km²...
  
   (鹿島郡), Ibaraki (The village of Asahi, the town of Hokota, and the village of Taiyō merged to form the city of Hokota
  Hokota, Ibaraki
  is a city located in Ibaraki Prefecture, Japan.Hokota city was established on October 11, 2005, by the merger of the former town of Hokota, and the villages of Asahi and Taiyō, all from Kashima District....
  
  )
• October 24, 2005 Mino District
  Mino District, Hyogo
  Mino was a district located in Hyōgo Prefecture, Japan.As of 2003, the district had an estimated population of 9,486 and a density of 168.04 persons per km². The total area was 56.45 km².-Merger:...
  
   (美嚢郡), Hyōgo (The town of Yokawa merged into the city of Miki
  Miki, Hyogo
  is a city located in Hyōgo, Japan.As of April 30, 2011, the city has an estimated population of 82,162, with a household number of 32,143 and a population density of 465.30 persons per km²...
  
  )
• November 1, 2005 Higashiyamanashi District
  Higashiyamanashi District, Yamanashi
  Higashiyamanashi was a district located in Yamanashi Prefecture, Japan.As of 2004, the district had an estimated population of 10,701...
  
   (東山梨郡), Yamanashi (The town of Katsunuma and the village of Yamato merged with the city of Enzan to form the city of Kōshū
  Koshu, Yamanashi
  is a city located in Yamanashi Prefecture, Japan.The city was founded on November 1, 2005, when the city of Enzan was merged with the town of Katsunuma, and the village of Yamato, both from Higashiyamanashi District, to form the new city of Kōshū....
  
  )
• November 1, 2005 Imizu District
  Imizu District, Toyama
  Imizu is a district located in Toyama, Japan.As of 2003, the district has an estimated population of 57,362 and a density of 747.39 persons per km²...
  
   (射水郡), Toyama (The towns of Kosugi, Daimon, Ōshima, and the village of Shimo merged with the city of Shinminato to form the city of Imizu
  Imizu, Toyama
  is a city located in Toyama, Japan.As of August 1, 2011, the city has an estimated population of 93,215 and a population density of 854 persons per km²...
  
  )
• November 1, 2005 Nishitonami District
  Nishitonami District, Toyama
  Nishitonami is a district located in Toyama, Japan.As of November 1, 2004, the district has a population of 13,770. The total area was 58.76 km².Prior to dissolution, the district has only one town left.* Fukuoka...
  
   (西礪波郡), Toyama (The town of Fukuoka merged with the city of Takaoka to form the city of Takaoka
  Takaoka, Toyama
  is a city situated in the northwest of Toyama Prefecture, Japan, and is the central city of its Western District. Takaoka covers the 8th largest surface area in Toyama prefecture and has the second largest population after Toyama City...
  
  )
• November 3, 2005 Saeki District
  Saeki District, Hiroshima
  was a district located in Hiroshima, Japan.As of 2003, the district had an estimated population of 54,592 and a density of . The total area was .-Towns and villages:...
  
   (佐伯郡), Hiroshima (The towns of Ōno and Miyajima merged into the city of Hatsukaichi
  Hatsukaichi, Hiroshima
  is a city of some 120,000 people located in Hiroshima Prefecture, Japan. The name derives from a market traditionally held on the 20th of each month with hatsuka meaning "20th day" and ichi translating to "market"...
  
  )
• November 7, 2005 Ōno District
  Ono District, Fukui
  was a district located in Fukui Prefecture, Japan.As of 2003, the district had an estimated population of 701 and a density of 2.11 persons per km². The total area was 332.38 km².-Merger:...
  
   (大野郡), Fukui (The village of Izumi merged into the city of Ōno
  Ono, Fukui
  is a city located in Fukui Prefecture, Japan.As of June 1, 2011, the city has an estimated population of 36,890 with 12,016 households and the density of 42.29 persons per km²...
  
  )
• November 7, 2005 Hioki District
  Hioki District, Kagoshima
  Hioki was a district located in Kagoshima, Japan. As of the merger of the town of Kinpō into the city of Minamisatsuma the district no longer exists....
  
   (日置郡), Kagoshima (The town of Kinpō merged with the city of Kaseda and three towns from Kawanabe District to form the city of Minamisatsuma
  Minamisatsuma, Kagoshima
  is a city located in Kagoshima Prefecture, Japan.The city was founded on November 7, 2005 from the merger of the old city of Kaseda, with the town of Kinpō, from Hioki District, and the towns of Bonotsu, Kasasa and Ōura, all from Kawanabe District, ....
  
  )

2006~

January 1, 2006

• Hienuki District (稗貫郡), Iwate (The towns of Ōhasama and Ishidoriya merged with the town of Tōwa from Waga District and the city of Hanamaki to form the city of Hanamaki
  Hanamaki, Iwate
  is a city located in Iwate Prefecture, Japan. As of March 31, 2011, the city has an estimated total population of 102,455, with a household number of 35,831. Hanamaki is most famous as the birthplace of Kenji Miyazawa and for its onsen. The city recently celebrated the 50th anniversary since its...
  
  )
• Nakakanbara District
  Nakakanbara District, Niigata
  Nakakanbara was a district located in Niigata Prefecture, Japan.-History:In 1878, Nakakanbara District was established.The district started to shrink after the town of Nuttary merged and Niigata continued to absorb the district...
  
   (中蒲原郡), Niigata (The town of Muramatsu merged with the city of Gosen to form the city of Gosen
  Gosen, Niigata
  is a city located in Niigata, Japan.As of 2005, the city has an estimated population of 56,965 and a density of 382.89 persons per km². The total area is 351.87 km².The city was founded on November 3, 1954...
  
  )
• Age District
  Age District, Mie
  was a district located in Mie Prefecture. Total population was 41,976 with a total area of 170.60 km².Until the day before the dissolution on December 31, 2005, the district had 3 towns and a village....
  
   (安芸郡), Mie (The towns of Kawage, Geinō, Anō, and the village of Misato merged with the 4 towns and villages from Ichishi District and the cities of Hisai and Tsu to form the city of Tsu
  Tsu, Mie
  is the capital of Mie Prefecture, Japan. The city of Tsu is located on Ise Bay, east of the city. Tsu is bounded to the north by Suzuka and Kameyama; to the west by Iga, Nabari, and Nara Prefecture; and to the south by Matsuzaka city.-History:...
  
  )
• Ichishi District
  Ichishi District, Mie
  Ichishi was a district located in Mie, Japan.As of 2003, the district had an estimated population of 70,117 and a density of 150.14 persons per km²...
  
   (一志郡), Mie (The towns of Ichishi, Karasu, Hakusan, and the village of Misugi merged with 4 towns and village from Age District and the cities of Hisai and Tsu to form the city of Tsu
  Tsu, Mie
  is the capital of Mie Prefecture, Japan. The city of Tsu is located on Ise Bay, east of the city. Tsu is bounded to the north by Suzuka and Kameyama; to the west by Iga, Nabari, and Nara Prefecture; and to the south by Matsuzaka city.-History:...
  
  )
• Kanzaki District
  Kanzaki District, Shiga
  Kanzaki was a district located in Shiga, Japan.As of 2003, the district had an estimated population of 41,048 and a density of 179.51 persons per km²...
  
   (神崎郡), Shiga (The town of Notogawa merged into the city of Higashiōmi
  Higashiomi, Shiga
  is a city located in Shiga Prefecture, Japan.As of 2008, the city has an estimated population of 117,557 and the density of 303 persons per km². The total area is 388.58 km²....
  
  )
• Amata District
  Amata District, Kyoto
  Amata was a district located in Kyoto, Japan.As of 2003, the district had an estimated population of 8,965 and a density of 46.81 persons per km². The total area was 191.52 km².-Merger:...
  
   (天田郡), Kyoto (The towns of Miwa and Yakuno merged into the city of Fukuchiyama
  Fukuchiyama, Kyoto
  is a city located in northern Kyoto Prefecture, Japan, on the Yura River. It is about 25 km inland from the Sea of Japan at the southern end of the Fukuchiyama Valley, and is surrounded by mountains to the south, west, and east....
  
  )
• Kasa District
  Kasa District, Kyoto
  Kasa was a district located in Kyoto, Japan.As of 2003, the district had an estimated population of 5,571 and a density of 57.55 persons per km². The total area was 96.81 km².-Merger:...
  
   (加佐郡), Kyoto (The town of Ōe merged into the city of Fukuchiyama)
• Kitakuwada District
  Kitakuwada District, Kyoto
  Kitakuwada was a district located in Kyoto Prefecture, Japan.As of 2005, the district had an estimated population of 5,233 and a density of 15.37 persons per km²...
  
   (北桑田郡), Kyoto (The town of Miyama merged with 3 towns from Funai District to form the city of Nantan
  Nantan, Kyoto
  is a city located in Kyoto, Japan.As of May 1, 2008, the city has an estimated population of 35,424. The total area is 616.31 km².The city was founded on January 1, 2006 by the merger of the former towns of Sonobe, Yagi, Hiyoshi, and Miyama...
  
  )
• Mitoyo District
  Mitoyo District, Kagawa
  was a district located in Kagawa, Japan. On January 1, 2006 all seven towns in the district merged forming the city of Mitoyo at which point the district was dissolved....
  
   (三豊郡), Kagawa (The towns of Takase, Yamamoto, Mino, Toyonaka, Takuma, Nio, and Saita merged to form the city of Mitoyo
  Mitoyo, Kagawa
  is a city located in Kagawa, Japan.As of 2005, the city has an estimated population of 71,178 and a density of 320 persons per km². The total area is 222.66 km²....
  
  )

January 23, 2006

• Toki District
  Toki District, Gifu
  was a district located in Gifu, Japan.The cities of Toki-all areas, Tajimi-excluding areas south of Tokigawa River, and Mizunami-excluding the former town of Toge are the areas of the former Toki District....
  
   (土岐郡), Gifu (The town of Kasahara merged into the city of Tajimi
  Tajimi, Gifu
  is a city located in Gifu Prefecture, Japan.As of April 1, 2011, the city has an estimated population of 112,165, with 40,413 number of households. The total area is 91.24 km²....
  
  )

February 1, 2006

• Asuwa District
  Asuwa District, Fukui
  Asuwa was a district located in Fukui Prefecture. The district had a population of 4,941 with an area of 250.74 km²....
  
   (足羽郡), Fukui (The town of Miyama merged into the city of Fukui
  Fukui, Fukui
  is the capital of Fukui Prefecture, Japan. The city is located in the north-central part of the prefecture on the coast of the Sea of Japan.-Demographics:...
  
  )

February 11, 2006

• Tsuna District
  Tsuna District, Hyogo
  Tsuna was a district located in Hyōgo Prefecture, Japan.As of 2005, the district had an estimated population of 11,500, and the total area was 58.21 km².-Former towns and villages:* Awaji* Goshiki* Higashiura* Hokudan* Ichinomiya...
  
   (津名郡), Hyōgo (The town of Goshiki merged with the city of Sumoto to form the city of Sumoto
  Sumoto, Hyogo
  is a city located on Awaji Island, Hyōgo, Japan. The city was founded on February 11, 1940.As of March 31, 2008, the city has an estimated population of 50,087 and a density of 267 persons per km²...
  
  )

March 1, 2006

• Fukayasu District
  Fukayasu District, Hiroshima
  Fukayasu was a district located in Hiroshima Prefecture until 2006. On October 1, 1898, the district was formed by the mergers of both Fukatsu and Yasuna Districts. On March 1, 2006, the last remaining town of Kannabe merged into the city of Fukuyama and the district dissolved...
  
   (深安郡), Hiroshima (The town of Kannabe merged into the city of Fukuyama
  Fukuyama, Hiroshima
  is a city located on the Ashida River in Hiroshima Prefecture, Japan.As of January 31, 2010, the city has an estimated population of 465,238 and a population density of 898.02 persons per km². The total area is 461.23 km². After Hiroshima City, it is the largest city in Hiroshima Prefecture...
  
  )
• Kami District
  Kami District, Kochi
  was a district located in Kōchi, Japan. The district was officially dissolved on March 1, 2006 when all its towns and villages merged into two new cities, Kami and Kōnan....
  
   (香美郡), Kochi (The towns of Tosayamada and Kahoku and the village of Monobe merged to form the city of Kami
  Kami, Kochi
  is a city located in Kōchi, Japan.As of its founding but with 2003 population estimates, the city has an estimated population of 30,591 and a density of 56.9 persons per km²...
  
  ; the towns of Akaoka, Kagami, Noichi, and Yasu and the village of Yoshikawa merged to form the city of Kōnan
  Konan, Kochi
  is a city located in Kōchi, Japan.As of its founding but with 2003 population estimates, the city has an estimated population of 33,721 and a density of 266 persons per km²...
  
  )

March 3, 2006

• Onyu District
  Onyu District, Fukui
  was a district located in Wakasa Province, Fukui, Japan until 2005.The time before the dissolution, the district had an area of 143.83km² with an estimated population of 2,747 with an area of 1,088 and a density of 49.08 persons per square kilometer. The total area is 225.91 km²...
  
   (遠敷郡), Fukui (The village of Natasho merged with the town of Ōi from Ōi District to form the town of Ōi
  Oi, Fukui
  is a town located in Ōi District, Fukui, Japan.As of 2005, the town has an estimated population of 9,216 and a density of 43 persons per km². The total area is 212 km²....
  
   in Ōi District)

March 15, 2006

• Kitakoma District
  Kitakoma District, Yamanashi
  Kitakoma was a district located in Yamanashi, Japan. The district was dissolved on March 15, 2006 when the town of Kobuchisawa merged into the city of Hokuto.-Timeline:* 1878: The district was formed out from the former Koma District....
  
   (北巨摩郡), Yamanashi (The town of Kobuchisawa merged into the city of Hokuto
  Hokuto, Yamanashi
  is a city located in Yamanashi, Japan.-Description:The city of Hokuto was founded by the merging of all the towns within the Kitakoma District except for the former town of Futaba, which merged with two municipalities to form the new city of Kai...
  
  )

March 18, 2006

• Usui District
  Usui District, Gunma
  was a district located in Gunma, Japan.As of 2003, the district had an estimated population of 16,556 and a density of 94.58 persons per km². The total area was 175.05 km²....
  
   (碓氷郡), Gunma (The town of Matsuida merged with the city of Annaka to form the city of Annaka
  Annaka, Gunma
  is a city located in Gunma, Japan.As of March 31, 2011, the city has an estimated population of 63,584, with a household number of 23,575 and the density of 230.09 persons per km²...
  
  )

March 19, 2006

• Nishiibaraki District
  Nishiibaraki District, Ibaraki
  Nishiibaraki , literally West Ibaraki, was a district located in Ibaraki, Japan. As of 2004, the district has an estimated population of 52,291...
  
   (西茨城郡), Ibaraki (The towns of Tomobe and Iwama merged with the city of Kasama to form the city of Kasama
  Kasama, Ibaraki
  is a city located in central Ibaraki, Japan.Kasama was once a castle town and post-station town during the Edo Period , and a shrine town of Kasama Inari Shrine in the Meiji Period . Stone quarrying is its main activity...
  
  )

March 20, 2006

• Sakai District
  Sakai District, Fukui
  Sakai was a district located in Fukui, Japan.As of October 1, 2005, the district had an estimated population of 92,312 and a density of 439.77 persons per km²...
  
   (坂井郡), Fukui (The towns of Sakai, Mikuni, Maruoka, and Harue merged to form the city of Sakai
  Sakai, Fukui
  is a city located in Fukui, Japan. It lies to the north of Fukui City. It was founded on March 20, 2006, by the merger of the towns of Harue, Maruoka, Mikuni, and Sakai of the former Sakai District, which was dissolved in this merger....
  
  )
• Shiga District
  Shiga District, Shiga
  Shiga was a district located in Shiga, Japan.As of 2003, the district has an estimated population of 21,964 and a density of 306.20 persons per km². The total area is 71.73 km²....
  
   (滋賀郡), Shiga (The town of Shiga merged into the city of Ōtsu
  Otsu, Shiga
  is the capital city of Shiga, Japan. The city was founded on October 1, 1898. As of October 1, 2010, the city has an estimated population of 338,629 with an average age of 40.7 years and a population density of 905.28 persons per km²...
  
  )
• Katō District
  Kato District, Hyogo
  Katō was a district located in Hyōgo Prefecture, Japan.As of 2008, the district had an estimated population of 40,334 and a density of 257.03 persons per km²...
  
   (加東郡), Hyōgo (The towns of Yashiro, Takino, and Tōjō merged to form the city of Katō
  Kato, Hyogo
  is a city located in Hyōgo Prefecture, Japan.The city was founded on March 20, 2006 from the merger of the former towns of Takino, Tōjō and Yashiro, all from Katō District....
  
  )

March 27, 2006

• Niihari District
  Niihari District, Ibaraki
  Niihari was a district located in Ibaraki, Japan. The district was dissolved on March 27, 2006.The district has only one village before dissolution.* Tamari-Timeline :...
  
   (新治郡), Ibaraki (The village of Tamari merged with the towns of Ogawa and Minori from Higashiibaraki District to form the city of Omitama
  Omitama, Ibaraki
  is a city located in Ibaraki, Japan. The city was formed on March 27, 2006 from the merger of the towns of Ogawa and Minori, both from Higashiibaraki District, and the village of Tamari, from Niihari District...
  
  )
• Tsukuba District
  Tsukuba District, Ibaraki
  Tsukuba was a district located in Ibaraki, Japan. At its greatest extent it included the areas of today's cities of Jōsō, Shimotsuma, Toride, Tsuchiura, Tsukuba, and Tsukuba Mirai.The district had two towns before the dissolution.* Ina* Yawara...
  
   (筑波郡), Ibaraki (The town of Ina and the village of Yawara merged to form the city of Tsukubamirai
  Tsukubamirai, Ibaraki
  is a city located in Ibaraki, Japan. The city was formed on March 27, 2006 from the merger of the town of Ina, and the village of Yawara, both from Tsukuba District....
  
  )
• Nitta District (新田郡), Gunma (The town of Kasakake merged with the town of Omama from Yamada District and the village of Azuma from Seta District to form the city of Midori
  Midori, Gunma
  is a city located in Gunma Prefecture, Japan.The name "Midori-shi", literally means "Greenery City".The city was founded on March 27, 2006 from the merger of the town of Ōmama, from Yamada District, the town of Kasakake, from Nitta District, and the village of Azuma, from Seta District.As of this...
  
  )
• Yamada District
  Yamada District, Gunma
  is a former district which was located in Gunma, Japan.As of 27 March 2006, the district has been dissolved in order to form the new city of Midori....
  
   (山田郡), Gunma (The town of Omama merged with the town of Kasakake from Nitta District and the village of Azuma from Seta District to form the city of Midori)
• Sōsa District (匝瑳郡), Chiba (The town of Hikari merged with the town of Yokoshiba from Sanbu District to form the town of Yokoshibahikari
  Yokoshibahikari, Chiba
  is a town located in Sanbu District, Chiba Prefecture, Japan. As of September 2010, the town had an estimated population of 24,913 and a population density of 372 persons per km². The total area was 66.91 km².-Geography:...
  
   in Sanbu District)
• Shisō District
  Shiso District, Hyogo
  Shiso is a district located in Hyōgo, Japan.As of April 1, 2005 , the district has an estimated population of 5,983 and a density of 99 persons per km²...
  
   (宍粟郡), Hyōgo (The town of Yasutomi merged into the city of Himeji
  Himeji, Hyogo
  is a city located in Hyōgo Prefecture in the Kansai region of Japan. As of April 1, 2011, the city has an estimated population of 535,945, with 206,409 households. The total area is 534.43 km².- History :...
  
  )
• Shikama District
  Shikama District, Hyogo
  Shikama was a district located in Hyogo, Japan.As of 2003, the district has an estimated population of 30,453 and a density of 182.91 persons per km². The total area is 166.49 km².On March 27, 2006, The district merged into Himeji....
  
   (飾磨郡), Hyōgo (The towns of Ieshima and Yumesaki merged into the city of Himeji)

March 31, 2006

• Shizunai
  Shizunai District, Hokkaido
  was a district located in Hidaka Subprefecture, Hokkaidō, Japan.In 2004, the district had an estimated population of 22,581 and a density of 28.17 persons per km². The total area was 801.51 km²....
  
   (静内郡) and Mitsuishi
  Mitsuishi District, Hokkaido
  was a district located in Hidaka Subprefecture, Hokkaidō, Japan.In 2004, the district had an estimated population of 4,950 and a density of 14.30 persons per km². The total area was 346.23 km²....
  
   (三石郡) Districts, Hokkaidō (Merged to form Hidaka District
  Hidaka District, Hokkaido
  is a district located in Hidaka Subprefecture, Hokkaidō, Japan.As of October 31, 2006, the district has an estimated population of 27,150 and a density of 23.7 persons per km². The total area is 1,147.74 km².- Towns and villages :*Shinhidaka...
  
   (日高郡))
• Shida District
  Shida District, Miyagi
  Shida was a district located in Miyagi, Japan.As of 2003, the district had an estimated population of 29,126 and a density of 226.17 persons per km²...
  
   (志田郡), Miyagi (The towns of Sanbongi, Matsuyama, and Kashimadai merged with two towns from Tamatsukuri District, the town of Tajiri from Tōda District, and the city of Furukawa to form the city of Ōsaki
  Osaki, Miyagi
  is a city located in Miyagi Prefecture, Japan. Its area is 796.76 km², and its population was 135,129 as of November 1, 2010. The area was hard-hit during the 2011 Tōhoku earthquake.The city was formed on March 31, 2006, when several jurisdictions merged together....
  
  )
• Tamatsukuri District
  Tamatsukuri District, Miyagi
  Tamatsukuri was a district located in Miyagi, Japan.As of 2003, the district had an estimated population of 22,240 and a density of 47.50 persons per km²...
  
   (玉造郡), Miyagi (The towns of Iwadeyama and Naruko merged with three towns from Shida District, the town of Tajiri from Tōda District, and the city of Furukawa to form the city of Ōsaki)
• Minamitakaki District
  Minamitakaki District, Nagasaki
  was a district located in Nagasaki, Japan. The district was dissolved on March 31, 2006.The district was equivalent to the cities of Shimabara, Unzen, and Minamishimabara....
  
   (南高来郡), Nagasaki (The towns of Kazusa, Kuchinotsu, Minamiarima, Kitaarima, Nishiarie, Arie, Futsu, and Fukae merged to form the city of Minamishimabara
  Minamishimabara, Nagasaki
  is a city in Nagasaki Prefecture, Japan. It occupies the southern tip of Shimabara Peninsula.Minamishimabara city was founded on March 31, 2006 upon the merger of the towns of Arie, Fukae, Futsu, Kazusa, Kitaarima, Kuchinotsu, Minami-Arima and Nishi-Arie, all from Minamitakaki District, which was...
  
  )

April 1, 2006

• Naga District
  Naga District, Wakayama
  Naga was a district located in Wakayama, Japan. The District dissolved on April 1, 2006 when the town of Iwade gained city status.There was only one town left within the district before the dissolution.* Iwade-History:...
  
   (那賀郡), Wakayama (The town of Iwade gained city status to become the city of Iwade
  Iwade, Wakayama
  is a city located in Wakayama, Japan.At the end of July 2006, the city had a population of 51,496. The total area is 38.50km².Negoroji temple was founded in 12th century...
  
  )

August 1, 2006

• Higashiyatsushiro District
  Higashiyatsushiro District, Yamanashi
  Higashiyatsushiro was a district located in Yamanashi, Japan.As of March 2006, the district has an estimated population of 513. The total area is 37.15 km²....
  
   (東八代郡), Yamanashi (The village of Ashigawa merged into the city of Fuefuki
  Fuefuki, Yamanashi
  is a city located in Yamanashi, Japan.The city was founded on October 12, 2004 from the merger of six towns and villages from Higashiyatsushiro and Higashiyamanashi Districts.The city abosorbed the village of Ashigawa on August 1, 2006...
  
  )

October 1, 2006

• Gunma District
  Gunma District, Gunma
  Gunma was a district located in Gunma, Japan.As of June 30, 2004, the district had an estimated population of 22,303. The total area was 93.59 km².Until the day before the dissolution , the district had one town....
  
   (群馬郡), Gunma (The town of Haruna merged into the city of Takasaki
  Takasaki, Gunma
  is a city located in Gunma Prefecture, Japan.The city was founded on April 1, 1900.Takasaki is a regional transportation hub because its train station is the junction of several rail lines as well as a Shinkansen stop....
  
  )

January 22, 2007

• Mitsu District
  Mitsu District, Okayama
  was a district located in Okayama, Japan. As of 2003, the district has an estimated population of 22,923. The total area is 345.10 km².On April 1, 1900, the district was founded after the mergers of Mino and Tsudaka Districts....
  
   (御津郡), Okayama (The town of Takebe merged into the city of Okayama
  Okayama, Okayama
  is the capital city of Okayama Prefecture in the Chūgoku region of Japan.The city was founded on June 1, 1889. As of August 2010, the city has an estimated population of 705,224 and a population density of 893 persons per km². The total area is 789.88 km²....
  
  )
• Akaiwa District
  Akaiwa District, Okayama
  Akaiwa was a district located in Okayama, Japan. As of 2004, the district has an estimated population of 14,945.The total area is 41.78 km²...
  
   (赤磐郡), Okayama (The town of Seto merged into the city of Okayama)

January 29, 2007

• Yamato District
  Yamato District, Fukuoka
  was a district located in Fukuoka, Japan. It was dissolved on January 29, 2007, when its remaining towns merged with Miike District to form the new city of Miyama....
  
   (山門郡), Fukuoka (The towns of Setaka and Yamakawa merged with the town of Takata from Miike District to form the city of Miyama
  Miyama, Fukuoka
  is a city located in Fukuoka Prefecture, Japan. The city was founded on January 29, 2007, from the merger of the town of Takata, from Miike District, and the towns of Setaka and Yamakawa, both from Yamato District....
  
  )
• Miike District
  Miike District, Fukuoka
  was a district located in Fukuoka, Japan. It was dissolved on January 29, 2007 when the town of Takata merged with the towns of Setaka and Yamakawa from Yamato District to form the new city of Miyama....
  
   (三池郡), Fukuoka (The town of Takata merged with the towns of Yamakawa and Setaka from Yamato District to form the city of Miyama
  Miyama, Fukuoka
  is a city located in Fukuoka Prefecture, Japan. The city was founded on January 29, 2007, from the merger of the town of Takata, from Miike District, and the towns of Setaka and Yamakawa, both from Yamato District....
  
  )

March 11, 2007

• Tsukui District
  Tsukui District, Kanagawa
  was formerly a district located in Kanagawa Prefecture, Japan. It was abolished on March 11, 2007 through merger into the neighboring city of Sagamihara.As of July 1, 2004, the district had an estimated population of 73,718. The total area was 238.44 km²...
  
   (津久井郡), Kanagawa (The towns of Shiroyama and Fujino merged into the city of Sagamihara
  Sagamihara, Kanagawa
  is a city located in north central Kanagawa Prefecture, bordering Tokyo, Japan. It is the third most populous city in the prefecture, after Yokohama and Kawasaki, and the fifth most populous suburb of Greater Tokyo. Its northern neighbor is Machida, with which a cross-prefectural merger has been...
  
  )

October 1, 2007

• Saga District
  Saga District, Saga
  was a district located in Saga Prefecture, Japan. The district was dissolved on October 1, 2007 and is now within the city of Saga.It consisted of three towns, including Higashiyoka, Kawasoe and Kubota.-Timeline:*April 1, 1889...
  
   (佐賀郡), Saga (The towns of Kawasoe, Kubota, and Higashiyoga merged into the city of Saga
  Saga, Saga
  is the capital of Saga Prefecture, located on the island of Kyūshū, Japan.Saga was the capital of Saga Domain in the Edo period, and largest city of former Hizen Province....
  
  )

December 1, 2007

• Kawanabe District (川辺郡), Kagoshima (The towns of Kawanabe and Chiran merged with the town of Ei from Ibusuki District to form the city of Minamikyūshū
  Minamikyushu, Kagoshima
  is a city on the southern tip of Satsuma Peninsula, in Kagoshima Prefecture, Japan.As of March 31, 2011, the city has a population of 39,738, with a household number of 17,288 and an area of 357.85 km²...
  
  )
• Ibusuki District
  Ibusuki District, Kagoshima
  Ibusuki was a district located in Kagoshima, Japan.As of June 30, 2005 population data , the district had an estimated population of 14,761 and a density of 134 persons per km²...
  
   (揖宿郡), Kagoshima (The town of Ei merged with the towns of Kawanabe and Chiran from Kawanabe District to form the city of Minamikyūshū)

March 21, 2008

• Mine District
  Mine District, Yamaguchi
  was a district located in Yamaguchi Prefecture, Japan.On March 20, 2008, the day before its dissolution, the district consisted solely of the towns of Mitō and Shūhō .-History:...
  
   (美祢郡), Yamaguchi (The towns of Mitō and Shūhō merged with the city of Mine to form the city of Mine
  Mine, Yamaguchi
  is a city located in Yamaguchi, Japan.- History :The city was founded on March 31, 1954 by a merger of municipalities that departed from Mine District ....
  
  )

November 1, 2008

• Ihara District
  Ihara District, Shizuoka
  was a rural district located in central Shizuoka, Japan.As of the end of 2008 , the district had an estimated population of 26,859 and a population density of 497.85 persons per km²...
  
   (庵原郡), Shizuoka (The town of Yui merged into the city of Shizuoka
  Shizuoka, Shizuoka
  is the capital city of Shizuoka Prefecture, Japan, and the prefecture's second-largest city in terms of both population and area. It became one of Japan's 19 "designated cities" in 2005.-Geography:...
  
  , the town of Fujikawa merged into the city of Fuji
  Fuji, Shizuoka
  is a city in eastern Shizuoka Prefecture. Fuji is the 3rd largest city in terms of population in Shizuoka Prefecture, trailing Hamamatsu and Shizuoka. As of February 2010, the city has an estimated population of 254,113 and a population density of 1040 persons per km²...
  
  )
• Isa District (伊佐郡), Kagosima (The town of Hishikari merged with the city of Ōkuchi to form the city of Isa
  Isa, Kagoshima
  is a city in Kagoshima Prefecture, Japan.A planned merger of municipalities was implemented on November 1, 2008; which the city was created from the merger of the old city of Ōkuchi, and the town of Hishikari, from Isa District...
  
  )

January 1, 2009

• Shida District
  Shida District, Shizuoka
  was a rural district located in central Shizuoka, Japan.As of the end of 2008 , the district had an estimated population of 12,110 and a population density of 227.25 persons per km². Its total area was 53.29 km².-HIstory:Shida District was created in the early Meiji cadastral reforms of 1879...
  
   (志太郡), Shizuoka (The town of Okabe merged into the city of Fujieda
  Fujieda, Shizuoka
  is a city located in Shizuoka, Japan. The modern city was founded on March 31, 1954. As of February 2009, the town has an estimated population of 142,023 and a density of 732 persons per km². The total area is 194.03 km².-Geography:...
  
  )

March 30, 2009

• Minaminaka District
  Minaminaka District, Miyazaki
  Minaminaka is a district located in Miyazaki Prefecture.Until the day before the dissolution, the district contained two towns.* Kitagō* Nangō-Timeline:...
  
   (南那珂郡), Miyazaki (The towns of Kitagō and Nangō merged with the city of Nichinan to form the city of Nichinan
  Nichinan, Miyazaki
  is a city in Miyazaki Prefecture, Japan. The city was founded on January 1, 1950. As of November 1, 2009, the city has an estimated population of 57,866 and a population density of 108 persons per km². The city's total area is 536.12 km²....
  
  )

May 5, 2009

• Seta District(勢多郡), Gunma (The village of Fujimi merged into the city of Maebashi
  Maebashi, Gunma
  is the capital city of Gunma Prefecture, Japan.The city was founded on April 1, 1892, by the samurai Makuba Kawai.On December 5, 2004 the town of Ōgo, and the villages of Kasukawa and Miyagi, all from Seta District, were merged into Maebashi....
  
  )

January 1, 2010

• Higashiazai District
  Higashiazai District, Shiga
  was a district located in Shiga Prefecture, Japan.From the reports of 2005 Census, the district had an estimated population of 14,509. The total area was 38.53km².-Timeline:*April 1, 1971 - The village of Biwa gained town status....
  
  (東浅井郡), Shiga (The towns of Torahime and Kohoku merged into the city of Nagahama
  Nagahama, Shiga
  is a city located in Shiga Prefecture, Japan on the eastern shore of Lake Biwa. The city center was developed and renamed by Toyotomi Hideyoshi when Hideyoshi moved his center of administration from Odani Castle...
  
  )
• Ika District
  Ika District, Shiga
  Ika was a district located in Shiga, Japan.As of 2003, the district had an estimated population of 27,986 and a density of 79.65 persons per km². The total area was 351.38 km²....
  
  (伊香郡), Shiga (The towns of Takatsuki, Kinomoto, Yogo, and Nishiazai merged into the city of Nagahama
  Nagahama, Shiga
  is a city located in Shiga Prefecture, Japan on the eastern shore of Lake Biwa. The city center was developed and renamed by Toyotomi Hideyoshi when Hideyoshi moved his center of administration from Odani Castle...
  
  )
• Itoshima District(糸島郡), Fukuoka (The towns of Nijō and Shima merged with the city of Maebaru to form the city of Itoshima
  Itoshima, Fukuoka
  is a city located in the western area of Fukuoka Prefecture, Japan. The city was formed on January 1, 2010, following the merger of the city of Maebaru with the two towns of Shima and Nijo....
  
  )

January 4, 2010

• Nishikamo District
  Nishikamo District, Aichi
  was a former rural district located in Nishimikawa Region in central Aichi, Japan.-History:Kamo District was one of the ancient districts of Shinano province, but was transferred to Mikawa province during the Sengoku period...
  
  (西加茂郡), Aichi (The town of Miyoshi become the city of Miyoshi
  Miyoshi, Aichi
  is a city located in central Aichi Prefecture, Japan. As of October 2011, the city had an estimated population of 60,534 and a population density of 1890 persons per km². The total area was 32.11 km².-Neighboring municipalities:*Toyota*Nisshin*Kariya...
  
  )

February 1, 2010

• Hoi District
  Hoi District, Aichi
  is a former rural district located in eastern Aichi Prefecture, Japan.As of 2008 , the district had an estimated population of 21,766 and a population density of 2194 persons per km². Its total area was 9.92 km².-History:...
  
  (宝飯郡), Aichi (The town of Kozakai merged into the city of Toyokawa
  Toyokawa, Aichi
  is a medium-sized city of about 180,000 people located in the eastern part of Aichi Prefecture, Japan. The city, founded on June 1, 1943, originally comprised the three formerly independent Hoi-gun towns of Toyokawa , Ko , Ushikubo , and the village of Yawata...
  
  )

March 23, 2010

• Kitasaitama District
  Kitasaitama District, Saitama
  was a district located in Saitama Prefecture.Prior to its abolition, Kita-Saitama District had three towns:*Town of Kisai *Town of Kitakawabe *Town of Ōtone...
  
  (北埼玉郡), Saitama (The towns of Kisai, Kitakawabe, and Ōtone merged with the city of Kazo to form the city of Kazo
  Kazo, Saitama
  is a city located in Saitama, Japan.As of April 1, 2011, the city has an estimated population of 117,339, with a household number of 42,778, and a density of 879.14 persons per km²...
  
  )
• Fuji District
  Fuji District, Shizuoka
  was a district located in Shizuoka Prefecture. The district covered the entire area of the city of Fujinomiya and parts of the city of Fuji.Until the day before the dissolution, the district had only one town....
  
  (富士郡), Shizuoka (The town of Shibakawa merged into the city of Fujinomiya
  Fujinomiya, Shizuoka
  is a city located in central Shizuoka Prefecture, Japan. As of 2010, the city had an estimated population of 122,464 and the density of 389 persons per km². The total area was 314.81 km².-Geography:...
  
  )
• Hamana District
  Hamana District, Shizuoka
  was a district located in Shizuoka, Japan.As of 2005 Census, the district had an estimated population of 16,938. The total area was 13.47km².*On July 1, 2005, the towns of Maisaka and Yūtō were merged into Hamamatsu; this left district with one municipality....
  
  (浜名郡), Shizuoka (The town of Arai merged into the city of Kosai
  Kosai, Shizuoka
  is a city located in far western Shizuoka Prefecture, Japan. As of 2010, the city has an estimated population of 60,582 and a density of 699 persons per km². The total area is 85.65 km².-Geography:...
  
  )
• Kamoto District
  Kamoto District, Kumamoto
  was a district located in Kumamoto Prefecture, Japan.As of 2003, the district had an estimated population of 31,088 and the density of 472.39 persons per square kilometer...
  
  (鹿本郡), Kumamoto (The town of Ueki merged into the city of Kumamoto
  Kumamoto, Kumamoto
  is the capital city of Kumamoto Prefecture on the island of Kyushu, Japan. Greater Kumamoto has a population of 1,460,000, as of the 2000 census...
  
  )
• Miyazaki District
  Miyazaki District, Miyazaki
  Miyazaki was a district located in Miyazaki Prefecture, Japan.As of 2003 population statistics but following the January 1, 2006 merger of the town of Sadowara and the town of Tano, the district had an estimated population of 28,937 and the density of 605.25 persons per km²...
  
  (宮崎郡), Miyazaki (The town of Kiyotake merged into the city of Miyazaki
  Miyazaki, Miyazaki
  is the capital city of Miyazaki Prefecture on the island of Kyūshū in Japan. Located on the coast and perforated by several rivers, Miyazaki City enjoys scenic views of both ocean and nearby, verdant mountains...
  
  )

March 31, 2010

• Kitauonuma District
  Kitauonuma District, Niigata
  was a district located in Niigata, Japan.- History :* On 1954, areas now covering Ojiya merged and gained city status.* On November 1, 2004 towns of Horinouchi and Koide, and the villages of Hirokami, Irihirose, Sumon and Yunotani merged to create the new city of Uonuma; leaving the village of...
  
  (北魚沼郡), Niigata (The town of Kawaguchi merged into the city of Nagaoka
  Nagaoka, Niigata
  is a city located in the central part of Niigata Prefecture, Japan. It is the second largest city in the prefecture, behind the capital city of Niigata...
  
  )

April 1, 2011

• Hazu District
  Hazu District, Aichi
  is a former rural district located in southeastern Aichi Prefecture, Japan.As of 2003 , the district had an estimated population of 58,921 and a population density of 696.88 persons per km²...
  
  (幡豆郡), Aichi (The towns of Hazu, Isshiki and Kira merged into the city of Nishio
  Nishio, Aichi
  is a city located in Aichi Prefecture, Japan. As of February 2011, the city has an estimated population of 165,443 and a population density of 1,030 persons per km². The total area is 160.34 km².-Geography:...
  
  )

August 1, 2011

• Yatsuka District
  Yatsuka District, Shimane
  was a district located in Shimane, Japan.As of 2003, the district had an estimated population of 59,733 and a density of 169.95 persons per km². The total area was 351.47 km².-Towns and villages:*Higashiizumo*Kashima*Mihonoseki*Shimane*Shinji*Tamayu...
  
  (八束郡), Shimane (The town of Higashiizumo merged into the city of Matsue
  Matsue, Shimane
  is the capital city of Shimane Prefecture in the Chūgoku region of Japan.As of August, 2011, the city has an estimated population of 207,000, following its most recent merging with Higashi-Izumo...
  
  )

September 26, 2011

• Higashiiwai District
  Higashiiwai District, Iwate
  Higashiiwai was a district located in Iwate, Japan.As of September 1, 2005, the district had an estimated population of 10,026...
  
  (東磐井郡), Iwate (The town of Fujisawa merged into the city of Ichinoseki
  Ichinoseki, Iwate
  is a city located towards the south of Iwate Prefecture, Japan and situated on the Iwai River. After Morioka and Ōshū, it is the third largest city in the prefecture.-Description:...
  
  )

October 1, 2011

• Kamitsuga District
  Kamitsuga District, Tochigi
  was a district located in Tochigi, Japan.As of 2003, the district had an estimated population of 20,718 and a density of 52.44 persons per km². The total area was 395.11 km².-Towns and villages:*Ashio*Awano*Nishikata-Mergers:...
  
  (上都賀郡), Tochigi (The town of Nishikata merged into the city of Tochigi
  Tochigi, Tochigi
  is a city located in Tochigi Prefecture, Japan. Despite its name, it is not the capital of Tochigi Prefecture; the capital is Utsunomiya.The city took its current form on March 29, 2010 when the old city of Tochigi merged with the towns of Fujioka, Ōhira and Tsuga from Shimotsuga District to form...
  
  )
• Hikawa District
  Hikawa District, Shimane
  was a district located in Shimane, Japan.As of 2003, the district had an estimated population of 57,333 and a density of 185.14 persons per km². The total area was 309.68 km².- Towns and villages :*Hikawa*Koryō*Sada*Taisha*Taki-Merger:...
  
  (簸川郡), Shimane (The town of Hikawa merged into the city of Izumo
  Izumo, Shimane
  is a city located in Shimane, Japan. Izumo is known for Izumo soba noodles and the Izumo Taisha Shinto shrine.-Demographics:The modern city was founded on November 3, 1941....
  
  )

November 11, 2011

• Ishikawa District
  Ishikawa District, Ishikawa
  was a district located in Ishikawa, Japan.As of February 2011, the district had an estimated population of 51,976 and a density of 3,830 persons per squire kilometer. The total area was 13.56 km²....
  
  (石川郡), Ishikawa (The town of Nonoichi
  Nonoichi, Ishikawa
  is a city located in Ishikawa, Japan.As of February 2011, the city has an estimated population of 51,976 and a density of 3,830 persons per km². The total area is 13.56 km²....
  
   become the city of Nonoichi)

See also

• List of dissolved municipalities of Japan