Mergers from April 1, 1999 to Present

• On January 1, 2001 - The cities of Urawa
  Urawa, Saitama
  was a city in Saitama Prefecture, Japan, until it merged into the city of Saitama together with two other cities, Omiya and Yono, on May 1, 2001. In 2003, the former area of Urawa became Urawa-ku, Midori-ku, Minami-ku, and Sakura-ku, which are wards of the city of Saitama...
  
  , Ōmiya
  Omiya, Saitama
  was a city in Saitama Prefecture, Japan. In 2001 it merged with two other cities to form the city of Saitama. Since 1 April 2003, the area of former Ōmiya city is Kita-ku, Minuma-ku, Nishi-ku, and Ōmiya-ku of Saitama city.-Origin and pre-modern history:...
  
   and Yono
  Yono, Saitama
  was a city in Saitama Prefecture, Japan. The town of Yono began on April 1, 1889. On July 15, 1958, Yono became a city. The city existed between cities of Urawa and Ōmiya. On May 1, 2001 it merged with Ōmiya and Urawa to form the new capital City of Saitama...
  
   merged to form the city of Saitama
  Saitama, Saitama
  ' is the capital and the most populous city of Saitama Prefecture in Japan, situated in the south-east of the prefecture. Its area incorporates the former cities of Urawa, Ōmiya, Yono and Iwatsuki. It is a city designated by government ordinance...
  
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• On January 1, 2005 - The village of Naguri from 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:...
  
   merged into the city of Hannō
  Hanno, Saitama
  is a city in Saitama Prefecture, Japan.As of April 1, 2011, the city has an estimated population of 82,683 and a population density of 614.29 per km²...
  
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• On April 1, 2005 - The town of Yoshida
  Yoshida, Saitama
  was a town in Chichibu District, Saitama, Japan.In 2003, the town had an estimated population of 5,728 and a population density of 86.66 persons per km²...
  
   and the villages of Arakawa
  Arakawa, Saitama
  was a village located in Chichibu District, Saitama, Japan.As of 2003, the village had an estimated population of 6,184 and a density of 131.66 persons per km²...
  
   and Ōtaki
  Otaki, Saitama
  was a village located in Chichibu District, Saitama, Japan.On April 1, 2005 Ōtaki, along with the town of Yoshida, and the village of Arakawa, all from Chichibu District, was merged into the expanded city of Chichibu and no longer exists as an independent municipality.In 2003, the village had an...
  
   (all from Chichibu District
  Chichibu District, Saitama
  Chichibu is a district located in Saitama Prefecture, Japan.As of 2003, the district has an estimated population of 61,755 and a density of 77.58 persons per km²...
  
  ) and the old city of Chichibu
  Chichibu, Saitama
  is a city in Saitama, Japan. As of April 1, 2011, the city has an estimated population of 68,701, with a household number of 26,230. The total area is 577.69 km²....
  
   merged to form the new city of Chichibu
  Chichibu, Saitama
  is a city in Saitama, Japan. As of April 1, 2011, the city has an estimated population of 68,701, with a household number of 26,230. The total area is 577.69 km²....
  
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• On April 1, 2005 - The city of Iwatsuki
  Iwatsuki, Saitama
  Iwatsuki was a city located within Saitama Prefecture, Japan until it merged into the city of Saitama on April 1, 2005.As of 2003, the city had an estimated population of 109,580 and the density of 2,229.05 persons per km². The total area was 49.16 km².The city was founded on July 1, 1954....
  
   merged into the city of Saitama
  Saitama, Saitama
  ' is the capital and the most populous city of Saitama Prefecture in Japan, situated in the south-east of the prefecture. Its area incorporates the former cities of Urawa, Ōmiya, Yono and Iwatsuki. It is a city designated by government ordinance...
  
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• On October 1, 2005 - The village of Ryōkami
  Ryokami, Saitama
  was a village located in Chichibu District, Saitama, Japan.As of 2003, the village had an estimated population of 2,920 and a density of 40.88 persons per km². The total area was 71.42 km²....
  
   and the old town of Ogano
  Ogano, Saitama
  is a town located in Chichibu District, Saitama, Japan. The rugged topography consists of mountains, valleys, lakes and rivers .On October 1, 2005 the village of Ryōkami, from Chichibu District, was merged into Ogano....
  
   (both from Chichibu District
  Chichibu District, Saitama
  Chichibu is a district located in Saitama Prefecture, Japan.As of 2003, the district has an estimated population of 61,755 and a density of 77.58 persons per km²...
  
  ) merged to form the new town of Ogano
  Ogano, Saitama
  is a town located in Chichibu District, Saitama, Japan. The rugged topography consists of mountains, valleys, lakes and rivers .On October 1, 2005 the village of Ryōkami, from Chichibu District, was merged into Ogano....
  
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• On October 1, 2005 - The town of Fukiage
  Fukiage, Saitama
  Fukiage was a town located in Kitaadachi District, Saitama, Japan.On October 1, 2005 Fukiage, along with the town of Kawasato, from Kitasaitama District, was merged in the expanded city of Kōnosu....
  
   from 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...
  
   and the town of Kawasato
  Kawasato, Saitama
  Kawasato was a town located in Kitasaitama District, Saitama, Japan.As of 2003, the town has an estimated population of 7,909 and a density of 477.02 persons per km². The total area is 16.58 km²....
  
   from 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...
  
   merged into the city of Kōnosu.

• On October 1, 2005 - The city of Kamifukuoka
  Kamifukuoka, Saitama
  was the name of a city located in Saitama Prefecture, Japan.On October 1, 2005, Kamifukuoka merged with the town of Ōi in Iruma District to form the new city of Fujimino....
  
   and the town of Ōi
  Oi, Saitama
  was the name of a town located in Iruma District, Saitama, Japan.On October 1, 2005 Ōi was merged with the old city of Kamifukuoka to form the new city of Fujimino....
  
   from 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:...
  
   merged to form the city of Fujimino
  Fujimino, Saitama
  is a city located in Saitama, Japan, about 30 km from central Tokyo. The city is surrounded by Kawagoe, Fujimi, and Miyoshi.The city is served by Kami-Fukuoka Station, about 35 minutes on the Tōbu Tōjō Line from Ikebukuro Station in Tokyo...
  
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• On October 1, 2005 - The town of Shōwa
  Showa, Saitama
  was a town located in Kitakatsushika District, Saitama, Japan.As of 2003, the town had an estimated population of 37,047 and a density of 1,316.06 persons per km². The total area was 28.15 km²....
  
   from 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...
  
   and the old city of Kasukabe
  Kasukabe, Saitama
  is a city in eastern Saitama, Japan, approximately north of Tokyo. It was formerly located in Kitakatsushika and Minamisaitama districts. Kasukabe once prospered as part of the Nikkō Kaidō highway, an important trade route that linked Edo with Nikkō.-Overview:...
  
   merged to form the new city of Kasukabe
  Kasukabe, Saitama
  is a city in eastern Saitama, Japan, approximately north of Tokyo. It was formerly located in Kitakatsushika and Minamisaitama districts. Kasukabe once prospered as part of the Nikkō Kaidō highway, an important trade route that linked Edo with Nikkō.-Overview:...
  
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• On October 1, 2005 - The towns of Ōsato
  Osato, Saitama
  was a town located in Ōsato District, Saitama, Japan.On October 1, 2005 Ōsato, along with the town of Menuma, also from Ōsato District, was merged into the expanded city of Kumagaya and no longer exists as an independent municipality....
  
   and Menuma
  Menuma, Saitama
  Menuma was a town located in Ōsato District, Saitama, Japan.On October 1, 2005 Menuma, along with the town of Ōsato, also from Ōsato District, was merged into the expanded city of Kumagaya and no longer exists as an independent municipality....
  
   from 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...
  
   and the old city of Kumagaya
  Kumagaya, Saitama
  is a city in Saitama Prefecture, Japan.As of 2010, the city has an estimated population of 203,089 . The total area is 159.88 km². The city is one of the biggest in northern Saitama Prefecture. It is the administrative, business and commercial centre in northern Saitama Prefecture. Eight...
  
   merged to form the new city of Kumagaya
  Kumagaya, Saitama
  is a city in Saitama Prefecture, Japan.As of 2010, the city has an estimated population of 203,089 . The total area is 159.88 km². The city is one of the biggest in northern Saitama Prefecture. It is the administrative, business and commercial centre in northern Saitama Prefecture. Eight...
  
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• On January 1, 2006 - The village of Kamiizumi
  Kamiizumi, Saitama
  Kamiizumi was a village located in Kodama District, Saitama, Japan.On January 1, 2006 Kamiizumi was merged into the expanded town of Kamikawa....
  
   and the old town of Kamikawa
  Kamikawa, Saitama
  is a town located in Kodama District, Saitama, Japan. Situated on the banks of the Kanna River. As of 2003, the town has an estimated population of 13,704 and a density of 591.45 persons per km². The total area is 23.17 km²....
  
   (both from 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...
  
  ) merged to form the new town of Kamikawa
  Kamikawa, Saitama
  is a town located in Kodama District, Saitama, Japan. Situated on the banks of the Kanna River. As of 2003, the town has an estimated population of 13,704 and a density of 591.45 persons per km². The total area is 23.17 km²....
  
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• On January 1, 2006 - The towns of Hanazono
  Hanazono, Saitama
  Hanazono was a town located in Ōsato District, Saitama, Japan.As of 2004, the town had an estimated population of 12,740 and a density of 805.31 persons per km². The total area was 15.82 km²....
  
  , Kawamoto
  Kawamoto, Saitama
  Kawamoto was a town located in Ōsato District, Saitama, Japan.As of 2005, the town had an estimated population of 12,120 and a density of 556.7 persons per km². The total area was 21.77 km²....
  
   and Okabe
  Okabe, Saitama
  Okabe was a town located in Ōsato District, Saitama, Japan.As of 2005, the town had an estimated population of 18,754 and a density of 613.07 persons per km². The total area was 30.59 km²....
  
   (all from 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...
  
  ) and the old city of Fukaya
  Fukaya, Saitama
  is a city located in the north of Saitama Prefecture, Japan. In the Edo era, it was an inn-town on the Nakasendō , and grew during this period. It is in the prefecture's leading agricultural area, and claim's to be the biggest producer of leeks in Japan. Fukaya negi are famous. Shibusawa Eiichi,...
  
   merged to form the new city of Fukaya
  Fukaya, Saitama
  is a city located in the north of Saitama Prefecture, Japan. In the Edo era, it was an inn-town on the Nakasendō , and grew during this period. It is in the prefecture's leading agricultural area, and claim's to be the biggest producer of leeks in Japan. Fukaya negi are famous. Shibusawa Eiichi,...
  
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• On January 1, 2006 - The village of Minamikawara
  Minamikawara, Saitama
  Minamikawara was a village located in Kitasaitama District, Saitama, Japan.On January 1, 2006 Minamikawara was merged into the city of Gyōda....
  
   from 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...
  
   merged into the city of Gyōda
  Gyoda, Saitama
  is a city in Saitama Prefecture, Japan.As of April 1, 2011, the city has an estimated population of 87,089, with 33,570 households and a population density of 1,292.70 persons per km²...
  
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• On January 10, 2006 - The town of Kodama
  Kodama, Saitama
  Kodama was a town located in Kodama District, Saitama, Japan.On January 10, 2006 Kodama was merged into the city of Honjō and no longer exists as an independent municipality....
  
   from 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...
  
   and the old city of Honjō
  Honjo, Saitama
  is a city located in Saitama Prefecture, Japan.As of May 1, 2011, the city has an estimated population of 81,267, with 32,685 households and a population density of 905.89 persons per km²...
  
   merged to form the new city of Honjō
  Honjo, Saitama
  is a city located in Saitama Prefecture, Japan.As of May 1, 2011, the city has an estimated population of 81,267, with 32,685 households and a population density of 905.89 persons per km²...
  
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• On February 1, 2006 - The villages of Tamagawa
  Tamagawa, Saitama
  Tamagawa was a village located in Hiki District, Saitama Prefecture, Japan.As of 2003, the village had an estimated population of 5,568 and a density of 387.20 persons per km². The total area was 14.38 km²....
  
   and Tokigawa
  Tokigawa, Saitama
  is a town located in Hiki District, Saitama Prefecture, Japan.On February 1, 2006 Tokigawa absorbed the village of Tamagawa, also from Hiki District, to become the new town of Tokigawa....
  
   from 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...
  
   merged to form the new "town" of Tokigawa
  Tokigawa, Saitama
  is a town located in Hiki District, Saitama Prefecture, Japan.On February 1, 2006 Tokigawa absorbed the village of Tamagawa, also from Hiki District, to become the new town of Tokigawa....
  
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• On February 13, 2007 - The town of Kōnan
  Konan, Saitama
  was a town located in Ōsato District, Saitama, Japan.As of 2003, the town had an estimated population of 13,826 and a density of 605.08 persons per km². The total area is 22.34 km²....
  
   from 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...
  
   merged into the city of Kumagaya
  Kumagaya, Saitama
  is a city in Saitama Prefecture, Japan.As of 2010, the city has an estimated population of 203,089 . The total area is 159.88 km². The city is one of the biggest in northern Saitama Prefecture. It is the administrative, business and commercial centre in northern Saitama Prefecture. Eight...
  
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• On March 23, 2010 - The towns of Kisai
  Kisai, Saitama
  was a town located in Kitasaitama District, Saitama, Japan.As of 2003, the town had an estimated population of 20,105 and a density of 702.97 persons per km². The total area was 28.60 km²....
  
  , Kitakawabe
  Kitakawabe, Saitama
  was a town located in Kitasaitama District, Saitama, Japan.As of June 1, 2009, the town had an estimated population of 12,763 and a density of 608 persons per km². The total area was 21.00 km²....
  
   and Ōtone
  Otone, Saitama
  was a town located in Kitasaitama District, Saitama, Japan.As of January 1, 2008, the town had an estimated population of 14,855 and a density of 607.07 persons per km². The total area was 24.47 km²....
  
   (all from 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...
  
  ) and the old 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...
  
   merged to form the new 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...
  
  . 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...
  
   was dissolved as a result of this merger.

• On March 23, 2010 - The town of Shōbu
  Shobu, Saitama
  was a town located in Minamisaitama District, Saitama, Japan.As of 2003, the town had an estimated population of 21,837 and a density of 797.84 persons per km²...
  
   from Minami Saitama District and the towns of Kurihashi
  Kurihashi, Saitama
  was a town located in Kitakatsushika District, Saitama, Japan.As of 2003, the town had an estimated population of 26,125 and a density of 1,655.58 persons per km²...
  
   and Washimiya
  Washimiya, Saitama
  was a town located in Kitakatsushika District, Saitama, Japan.As of 2003, the town had an estimated population of 33,739 and a density of 2,427.27 persons per km²...
  
   (both from 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...
  
  ) and the old city of Kuki
  Kuki, Saitama
  is a city located in Saitama, Japan.As of May 1, 2011, the city has an estimated population of 156,613, with a household number of 61,071, and the density of 1,900.64 persons per km²...
  
   merged to form the new city of Kuki
  Kuki, Saitama
  is a city located in Saitama, Japan.As of May 1, 2011, the city has an estimated population of 156,613, with a household number of 61,071, and the density of 1,900.64 persons per km²...
  
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• On October 11, 2011 - The city of Hatogaya
  Hatogaya, Saitama
  was a city located in Saitama Prefecture, Japan.As of April 1, 2011, the city had an estimated population of 61,781, with 26,902 households, and a population density of 9,932.64 per km². The total area was 6.22 km², the second smallest among all cities in Japan....
  
   merged into the city of Kawaguchi
  Kawaguchi, Saitama
  is a city located in Saitama Prefecture, Japan. The city was founded on April 1, 1933.As of January 1, 2011, the city has an estimated population of 517,171, the second largest in Saitama Prefecture after Saitama, and a population density of 9,276.61 persons per km². The total area is 55.75 km²...
  
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