Mergers from April 1, 1999 to Present

• On August 20, 2003 - the town of Tahara absorbed the town of Akabane to become 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:...
  
  .

• On April 1, 2005 - the towns of Heiwa
  Heiwa, Aichi
  was a town located in Nakashima District, Aichi, Japan.On April 1, 2005 Heiwa, along with the town of Sobue, from Nakashima District was merged into the city of Inazawa....
  
   and Sobue
  Sobue, Aichi
  was a town located in Nakashima District, Aichi, Japan.On April 1, 2005, Sobue, along with the town of Heiwa, from Nakashima District was merged into the city of Inazawa....
  
   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...
  
  . 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:...
  
   was dissolved as a result of this merger.

• On April 1, 2005 - the city of Bisai
  Bisai, Aichi
  was a city located in Aichi Prefecture, Japan. The city was founded on January 1, 1955.On April 1, 2005 Bisai, along with the town of Kisogawa, from Haguri District, was merged into the expanded city of Ichinomiya....
  
   and the town of Kisogawa
  Kisogawa, Aichi
  was a town located in Haguri District, Aichi, Japan.On April 1, 2005 Kisogawa, along with the city of Bisai, was merged into the expanded city of Ichinomiya....
  
   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....
  
  . 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...
  
   was dissolved as a result of this merger.

• On April 1, 2005 - the towns of Saya
  Saya, Aichi
  was a town located in Ama District, Aichi, Japan.On April 1, 2005 Saya was merged with the towns of Saori, and the villages of Hachikai and Tatsuta, all from Ama District. The new city name is Aisai City....
  
   and Saori
  Saori, Aichi
  was a town located in Ama District, Aichi, Japan.On April 1, 2005 Saori was merged with the town of Saya, and the villages of Hachikai and Tatsuta, all from Ama District. The new city name is Aisai City....
  
   and the villages of Hachikai
  Hachikai, Aichi
  was a village located in Ama District, Aichi, Japan.On April 1, 2005 Hachikai was merged with the towns of Saya and Saori, and the village of Tatsuta, all from Ama District. The new city name is Aisai City....
  
   and Tatsuta
  Tatsuta, Aichi
  Tatsuta was a village located in Ama District, Aichi, Japan.On April 1, 2005 Tatsuta was merged with the towns of Saya and Saori, and the village of Hachikai, all from Ama District. The new city name is Aisai City....
  
   from 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...
  
   merged to form the new city of Aisai
  Aisai, Aichi
  is a city located in the Owari Region of Aichi Prefecture, Japan.On April 1, 2005, Saya and Saori Towns and Hachikai and Tatsuta Villages of Ama District were merged into Aisai....
  
  .

• On April 1, 2005 - the towns of Fujioka
  Fujioka, Aichi
  is a former town located in Nishikamo District, Aichi Prefecture, Japan. As of December 1, 2004, the town had an estimated population of 19,239 and a population density of 293.4 persons per km²...
  
   and Obara
  Obara, Aichi
  is a former village located in Nishikamo District, Aichi Prefecture, Japan. As of December 1, 2004, the town had an estimated population of 4,353 and a population density of 58.4 persons per km². Its total area was 74.54 km². Obara was well known as the home of traditional Japanese "Washi" mulberry...
  
   from 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...
  
   and the towns of Asuke
  Asuke, Aichi
  is a former town located in Higashikamo District, Aichi Prefecture, Japan. As of March 1, 2005, the town had an estimated population of 9,699and a population density of 50.25 persons per km². Its total area was 193.00 km²...
  
  , Shimoyama
  Shimoyama, Aichi
  is a former village located in Higashikamo District, Aichi Prefecture, Japan. As of April 1, 2004, the village had an estimated population of 5,593 and a population density of 48.9 persons per km²...
  
  , Asahi
  Asahi, Aichi
  is a former town located in Higashikamo District, Aichi Prefecture, Japan. As of September 1, 2004, the town had an estimated population of 3,553 and a population density of 110.65 persons per km². Its total area was 32.11 km²....
  
   and Inabu
  Inabu, Aichi
  is a former town located in Higashikamo District, Aichi Prefecture, Japan. A final population count was held on March 1, 2005 and the town had a population of 9,699 and a population density of 98.6 persons per km²...
  
   from 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...
  
   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...
  
  . 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...
  
   was dissolved as a result of this merger.

• On July 7, 2005 - the towns of Kiyosu, Shinkawa
  Shinkawa, Aichi
  Shinkawa was a town located in Nishikasugai District, Aichi Prefecture, Japan.As of 2003, the town had an estimated population of 18,761 and a density of 3,991.70 persons per km². The total area was 4.70 km²....
  
   und Nishibiwajima
  Nishibiwajima, Aichi
  Nishibiwajima was a town located in Nishikasugai District, Aichi Prefecture, Japan.As of 2003, the town had an estimated population of 16,531 and a density of 4,919.94 persons per km². The total area was 3.36 km²....
  
   merged to form the new city of Kiyosu
  Kiyosu, Aichi
  was a town located in Nishikasugai District, Aichi, Japan., the town had an estimated population of 19,409 and a density of 3,696.95 persons per km²...
  
  .

• On October 1, 2005 - the village of Tsugu
  Tsugu, Aichi
  is a former village located in Kitashitara District, Aichi Prefecture, Japan. As of May 1, 2004, the village had an estimated population of 1,553 and a density of 29.3 persons per km². The total area was 53.13 km².-Geography:...
  
   merged with the old town of Shitara
  Shitara, Aichi
  is a town located in Kitashitara District, Aichi Prefecture, Japan. As of 2010, the town had an estimated population of 5,747 and a population density of 21 persons per km². The total area was 273.96 km².-Geography:...
  
   (both from Kitashitara District
  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...
  
  ) to form the new town of Shitara
  Shitara, Aichi
  is a town located in Kitashitara District, Aichi Prefecture, Japan. As of 2010, the town had an estimated population of 5,747 and a population density of 21 persons per km². The total area was 273.96 km².-Geography:...
  
  .

• On October 1, 2005 - the town of Atsumi
  Atsumi, Aichi
  is a former town located in Atsumi District, Aichi Prefecture, Japan. As of July 31, 2005, the town had an estimated population of 22,472 and a population density of 436.77 persons per km². Its total area was 82.18 km².-Geography:...
  
   from 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....
  
   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:...
  
  . 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....
  
   was dissolved as a result of this merger.

• On October 1, 2005 - the old 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:...
  
   merged with 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:...
  
   and the village of Tsukude
  Tsukude, Aichi
  is a former village located in Minamishitara District, Aichi Prefecture, Japan. As of May 1, 2004, the village had an estimated population of 3,263 and a density of 27.8 persons per km². Its total area was 117.40 km².-Geography:...
  
   from 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:...
  
   to create the new 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:...
  
  . 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:...
  
   was dissolved as a result of this merger.

• On November 27, 2005 - the village of Tomiyama
  Tomiyama, Aichi
  is a former village located in Kitashitara District, Aichi Prefecture, Japan. As of May 1, 2004, the village had an estimated population of 218 and a density of 6.3 persons per km². Its total area was 34.78 km².-Geography:...
  
   from Kitashitara District
  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...
  
   merged into the village of Toyone
  Toyone, Aichi
  is a village located in Kitashitara District, Aichi Prefecture, Japan. As of 2010, the village had an estimated population of 1,315 and a population density of 8.43 persons per km². The total area was 155.91 km².-Geography:...
  
  .

• On January 1, 2006 - the town of Nukata
  Nukata, Aichi
  was a town located in Nukata District, Aichi, Japan.As of 2003, the town had an estimated population of 9,307 and a density of 58.07 persons per km². The total area was 160.27 km².On January 1, 2006 Nukata was merged into the city of Okazaki....
  
   from Nukata District
  Nukata District, Aichi
  is a rural district located in central Aichi, Japan. As a result of various consolidations and mergers of municipalities, most of the district was incorporated into the cities of Okazaki and Toyota, and now consists of only the town of Kōta....
  
   merged into the city of Okazaki
  Okazaki, Aichi
  is a city located in Aichi Prefecture, Japan. As of August 2011, the city had an estimated population of 373,339 and a population density of 964 persons per km². The total area was 387.24 km².-Geography:...
  
  .

• On February 1, 2006 - the town of Ichinomiya from 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:...
  
   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...
  
  .

• On March 20, 2006 - the towns of Shikatsu
  Shikatsu, Aichi
  Shikatsu was a town located in Nishikasugai District, Aichi, Japan.As of 2003, the town has an estimated population of 43,299 and a density of 5,160.79 persons per km². The total area is 8.39 km²....
  
   and Nishiharu
  Nishiharu, Aichi
  Nishiharu was a town located in Nishikasugai District, Aichi, Japan.As of 2003, the town had an estimated population of 33,752 and a density of 3,381.96 persons per km². The total area was 9.98 km²....
  
   from Nishikasugai District
  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...
  
   merged to form the new city of Kitanagoya
  Kitanagoya, Aichi
  , or North Nagoya transliterally, is a city located in Aichi, Japan. The city was created as a result of merger of two neighboring towns, Shikatsu and Nishiharu on March 20, 2006....
  
  .

• On April 1, 2006 - the village of Jūshiyama
  Jushiyama, Aichi
  was a village located in Ama District, Aichi, Japan.On April 1, 2006 Jūshiyama was merged into the town of Yatomi to gain the city status.As of 2003, the village had an estimated population of 5,687 and a density of 570.41 persons per km². The total area was 9.97 km².-External links:* in Japanese...
  
   merged into the town of Yatomi
  Yatomi, Aichi
  is a city located in Aichi Prefecture, Japan.The city was founded on April 1, 2006, as a result of the merger between the town of Yatomi and the village of Jūshiyama, from Ama District....
  
   from 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...
  
   to become the city of Yatomi
  Yatomi, Aichi
  is a city located in Aichi Prefecture, Japan.The city was founded on April 1, 2006, as a result of the merger between the town of Yatomi and the village of Jūshiyama, from Ama District....
  
  .

• On January 15, 2008 - the towns of Otowa
  Otowa, Aichi
  was formerly a town located in Hoi District, Aichi, Japan. On January 15, 2008 Otowa was merged with the city of Toyokawa.As of November 1, 2007 , the town had an estimated population of 8,870 and a population density of 299.15 persons per km². The total area was 29.65 km².-Geography:*Principal...
  
   and Mito
  Mito, Aichi
  was a former town located in Hoi District, Aichi, Japan.On January 15, 2008 Mito was merged with the city of Toyokawa.As of 2007 , the town had an estimated population of 13,536 and a population density of 722.69 persons per km²...
  
   from 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:...
  
   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...
  
  .

• On October 1, 2009 - the town of Haruhi
  Haruhi, Aichi
  was a town located in Nishikasugai District, Aichi, Japan.As of 2003, the town had an estimated population of 8,284 and a density of 2,065.84 persons per km². The total area was 4.01 km².On October 1, 2009 Haruhi merged into the city of Kiyosu....
  
  , from Nishikasugai District
  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...
  
  , merged
  Merger and dissolution of municipalities of Japan
  Municipal mergers and dissolutions carried out in Japan can take place within one municipality or between multiple municipalities and are required to be based upon consensus.- Merger policy:...
  
   into the city of Kiyosu
  Kiyosu, Aichi
  was a town located in Nishikasugai District, Aichi, Japan., the town had an estimated population of 19,409 and a density of 3,696.95 persons per km²...
  
  , this leaves Nishikasugai District with one municipality.

• On January 4, 2010 - the town 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...
  
  , from 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...
  
   became a city; Nishikamo District ceased to exist.

• On February 1, 2010 - the town of Kozakai
  Kozakai, Aichi
  was a formerly a town located in Hoi District, Aichi, Japan.As of November 1, 2007, the town had an estimated population of 22,708 and a population density of 2,188.31 persons per km². The total area was 9.92 km²....
  
   from 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:...
  
   merged
  Merger and dissolution of municipalities of Japan
  Municipal mergers and dissolutions carried out in Japan can take place within one municipality or between multiple municipalities and are required to be based upon consensus.- Merger policy:...
  
   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...
  
  ; Hoi District ceased to exist.

• On March 22, 2010 - the towns of Shippō
  Shippo, Aichi
  was a town located in Ama District, Aichi, Japan.As of 2003, the town had an estimated population of 22,795 and a density of 2,736.49 persons per km². The total area was 8.33 km²....
  
  , Jimokuji
  Jimokuji, Aichi
  was a town located in Ama District, Aichi, Japan.As of 2003, the town had an estimated population of 37,651 and a density of 4,035.48 persons per km². The total area was 9.33 km²....
  
   and Miwa
  Miwa, Aichi
  was a town located in Ama District, Aichi, Japan.As of 2003, the town had an estimated population of 23,961 and a density of 2,415 persons per km². The total area was 9.92 km²....
  
   from 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...
  
   merged
  Merger and dissolution of municipalities of Japan
  Municipal mergers and dissolutions carried out in Japan can take place within one municipality or between multiple municipalities and are required to be based upon consensus.- Merger policy:...
  
   into the new city of Ama
  Ama, Aichi
  is a city located in Aichi, Japan.On March 22, 2010 the neighboring towns of Shippō, Miwa and Jimokuji from Ama District merged to form Ama.After merger the city had a population of 86,103. The total area is 27.59 km².-External links:*...
  
  .

• On April 1, 2011 - the towns of Hazu
  Hazu, Aichi
  is a former town located in Hazu District, Aichi Prefecture, Japan. As of May 1, 2004, the village had an estimated population of 12,351 and a population density of 474.13 persons per km². Its total area was 26.05 km²....
  
  , Isshiki
  Isshiki, Aichi
  is a former town located in Hazu District, Aichi Prefecture, Japan. As of May 1, 2004, the village had an estimated population of 23,775 and a population density of 1055.25 persons per km². Its total area was 22.53 km²....
  
   and Kira
  Kira, Aichi
  is a former town located in Hazu District, Aichi Prefecture, Japan. As of May 1, 2004, the village had an estimated population of 22,280 and a population density of 619.2 persons per km². Its total area was 35.98 km²....
  
  , from 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...
  
  , merged
  Merger and dissolution of municipalities of Japan
  Municipal mergers and dissolutions carried out in Japan can take place within one municipality or between multiple municipalities and are required to be based upon consensus.- Merger policy:...
  
   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:...
  
  . Hazu District was dissolved as a result of this merger.

Planned/Future Mergers

• A planned merger of municipalities will be implemented on January 4, 2012; the town of Nagakute
  Nagakute, Aichi
  is a town located in Aichi District, Aichi, Japan.On March 25, 2005, Expo 2005 opened with its main site being in Nagakute...
  
  , from Aichi District
  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...
  
  will gain city status, leaving Aichi District with one municipality.