Mergers from April 1, 1999 to Present

• On November 15, 2001 - the town of Sanriku from Kesen District
  Kesen District, Iwate
  is a district located in Iwate Prefecture, Japan. Kesen consists of the cities of Ōfunato and Rikuzentakata and the town of Sumita. The area of Sanriku, home to Kitasato University of Fishery Sciences, was an independent town within Kesen until 2001, when it amalgamated with Ofunato.Ofunato is a...
  
   merged into the city of Ōfunato
  Ofunato, Iwate
  is a coastal city located in Iwate, Japan.It was founded on April 1, 1952.On November 15, 2001, the town of Sanriku, from Kesen District, was merged into Ōfunato....
  
  .

• On June 6, 2005 - the town of Tarō
  Taro, Iwate
  was a town located in Shimohei District, Iwate, Japan.On June 6, 2005 Tarō, along with the village of Niisato, was merged into the expanded city of Miyako and no longer exists as an independent municipality....
  
   and village of Niisato
  Niisato, Iwate
  Niisato was a village located in Shimohei District, Iwate, Japan.On June 6, 2005 Niisato, along with the town of Tarō, was merged into the expanded city of Miyako and no longer exists as an independent municipality....
  
   from 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...
  
   merged with the former city of Miyako
  Miyako, Iwate
  is a city located in Iwate, Japan.It was founded on February 11, 1941.The city lies along the coast where the flows into the Pacific Ocean. It is connected to Morioka by an east-west train line and highway and the coastal highway also goes through the town...
  
   to create the new city of Miyako
  Miyako, Iwate
  is a city located in Iwate, Japan.It was founded on February 11, 1941.The city lies along the coast where the flows into the Pacific Ocean. It is connected to Morioka by an east-west train line and highway and the coastal highway also goes through the town...
  
  .

• On September 1, 2005 - the towns of Ashiro
  Ashiro, Iwate
  was a town located in Iwate District, Iwate, Japan.On September 1, 2005 Ashiro, along with the town of Nishine, and the village of Matsuo, was merged to form the city of Hachimantai and no longer exists as an independent municipality....
  
   and Nishine
  Nishine, Iwate
  was a town located in Iwate District, Iwate, Japan.On September 1, 2005 Nishine, along with the town of Ashiro, and the village of Matsuo, was merged to form the city of Hachimantai and no longer exists as an independent municipality....
  
   and the village of Matsuo
  Matsuo, Iwate
  Matsuo was a village located in Iwate District, Iwate, Japan.On September 1, 2005 Matsuo, along with the towns of Ashiro and Nishine, was merged to form the city of Hachimantai and no longer exists as an independent municipality....
  
   from 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...
  
   merged, forming the city of Hachimantai
  Hachimantai, Iwate
  is a city located in Iwate, Japan.Hachimantai was founded on September 1, 2005 from the merger of the towns of Ashiro and Nishine and the village of Matsuo, all from Iwate District....
  
  .

• On September 20, 2005 - the new 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:...
  
  was created out from the former 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:...
  
   and the municipalities of Daitō
  Daito, Iwate
  was a town located in Higashiiwai District, Iwate, Japan.On September 20, 2005 Daitō, along with the towns of Higashiyama and Senmaya, the villages of Kawasaki and Murone, all from Higashiiwai District, and the town of Hanaizumi, from Nishiiwai District, was merged into the expanded city of...
  
  , Higashiyama
  Higashiyama, Iwate
  was a town located in Higashiiwai District, Iwate, Japan.On September 20, 2005 Higashiyama, along with the towns of Daitō and Senmaya, the villages of Kawasaki and Murone, all from Higashiiwai District, and the town of Hanaizumi, from Nishiiwai District, was merged into the expanded city of...
  
  , Senmaya
  Senmaya, Iwate
  was a town located in Higashiiwai District, Iwate, Japan. The name translates as 'one thousand stables' although today there are no horses or stables remaining....
  
  , Kawasaki
  Kawasaki, Iwate
  Kawasaki was a village located in Higashiiwai District, Iwate, Japan.On September 20, 2005 Kawasaki, along with the towns of Daitō, Higashiyama and Senmaya, the village of Murone, all from Higashiiwai District, and the town of Hanaizumi, from Nishiiwai District, was merged into the expanded city...
  
  , Murone
  Murone, Iwate
  Murone was a village located in Higashiiwai District, Iwate, Japan.On September 20, 2005 Murone, along with the towns of Daitō, Higashiyama and Senmaya, the village of Kawasaki, all from Higashiiwai District, and the town of Hanaizumi, from Nishiiwai District, was merged into the expanded city of...
  
   (first 5 municipalities are from 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...
  
  ), and Hanaizumi
  Hanaizumi, Iwate
  Hanaizumi was a town located in Nishiiwai District, Iwate, Japan.On September 20, 2005 Hanaizumi, along with the towns of Daitō, Higashiyama and Senmaya, and the villages of Kawasaki and Murone, all from Higashiiwai District, was merged into the expanded city of Ichinoseki and no longer exists as...
  
   from Nishiiwai District
  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...
  
  .

• On October 1, 2005 - the village of Miyamori
  Miyamori, Iwate
  Miyamori was a village located in Kamihei District, Iwate, Japan.On October 1, 2005 Miyamori was merged into the expanded city of Tōno and no longer exists as an independent municipality....
  
   from 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....
  
   and the former city of Tōno
  Tono, Iwate
  is a city located in Iwate, Japan. The city of Tōno lies near the center of Iwate Prefecture in the floodplain of the Sarugaishi River. It is known as "The City of Folklore" for its rural nature, its preservation of traditional culture and especially for the collection of folktales, Tōno...
  
   merged to form the new city of Tōno
  Tono, Iwate
  is a city located in Iwate, Japan. The city of Tōno lies near the center of Iwate Prefecture in the floodplain of the Sarugaishi River. It is known as "The City of Folklore" for its rural nature, its preservation of traditional culture and especially for the collection of folktales, Tōno...
  
  .

• On November 1, 2005 - the town of Yuda
  Yuda, Iwate
  was a town located in Waga District, Iwate, Japan.On November 1, 2005, Yuda was merged with the village of Sawauchi to form the new town of Nishiwaga, and no longer exists as an independent municipality....
  
   and village of Sawauchi
  Sawauchi, Iwate
  was a village located in Waga District, Iwate, Japan.On November 1, 2005 Sawauchi was merged with the town of Yuda to form the new town of Nishiwaga and no longer exists as an independent municipality....
  
   from 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....
  
   merged forming the town of Nishiwaga
  Nishiwaga, Iwate
  is a town located in Waga District, Iwate, Japan. The town was founded on November 1, 2005 from the merger of the town of Yuda and the village of Sawauchi. This merger occurred under pressure from the national government of Japan and in the face of steady but significant depopulating trends in Yuda...
  
  .

• On January 1, 2006 - the towns of Ishidoriya
  Ishidoriya, Iwate
  was a town located in Hienuki District, Iwate, Japan.On January 1, 2006 Ishidoriya was merged with the town of Tōwa, from Waga District, the town of Ōhasama, from Hienuki District, and the old city of Hanamaki to form the new city of Hanamaki....
  
   and Ōhasama
  Ohasama, Iwate
  , formerly an independent town, is now a district of Hanamaki in the heart of the Iwate Prefecture in the north of Honshū, Japan.As of November, 2005, the town had an estimated population of 6,766 people. The total area was 246.84 km² , formerly an independent town, is now a district of...
  
   (from Hienuki District) and the town of Tōwa
  Towa, Iwate
  was a town located in Waga District, Iwate Prefecture, Japan. It is currently a branch of Hanamaki City.On January 1, 2006 Tōwa was merged with the towns of Ishidoriya and Ōhasama, both from Hienuki District, and the old city of Hanamaki to form the new city of Hanamaki.As of 2003, the town had an...
  
   (from 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....
  
  ) merged with 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...
  
   to become the new 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...
  
  . Hienuki District was dissolved as a result of this merger.

• On January 1, 2006 - the city of Ninohe
  Ninohe, Iwate
  is a city located in Iwate, Japan.On January 1, 2006, the existing city of Ninohe merged with the neighboring town of Jōbōji and formed a new city still named Ninohe. The new city's population is estimated to be 30,407, with a total area of 420.31 km²...
  
   and the town of Jōbōji
  Joboji, Iwate
  was a town located in Ninohe District, Iwate, Japan. It merged into the city of Ninohe.As of 2003, the town had an estimated population of 5,130 and a density of 28.55 persons per km². The total area was 179.70 km²....
  
   from Ninohe District
  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...
  
   merged to become the new city of Ninohe
  Ninohe, Iwate
  is a city located in Iwate, Japan.On January 1, 2006, the existing city of Ninohe merged with the neighboring town of Jōbōji and formed a new city still named Ninohe. The new city's population is estimated to be 30,407, with a total area of 420.31 km²...
  
  .

• On January 1, 2006 - the village of Ōno
  Ono, Iwate
  was a village located in Kunohe District, Iwate, Japan.On April 1, 2005 Ōno was merged with the town of Taneichi to form the new town of Hirono....
  
   and the town of Taneichi
  Taneichi, Iwate
  Taneichi was the northernmost Pacific municipality in Kunohe County, Iwate Prefecture, Honshū Island, Japan.* Area 168.55 km² * Population 16,962* Local foods uni , hoya...
  
   (both from 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....
  
  ) merged into the town of Hirono
  Hirono, Iwate
  is the northernmost Pacific municipality in Kunohe District, Iwate Prefecture, Honshū island, Japan. As of August 31, 2011 the town has a population of 19,070.-History:...
  
  .

• On January 10, 2006 - the village of Tamayama
  Tamayama, Iwate
  Tamayama was a village located in Iwate District, Iwate, Japan.On January 10, 2006 Tamayama was merged into the city of Morioka....
  
   from 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...
  
   merged into the city of Morioka
  Morioka, Iwate
  is the capital city of Iwate Prefecture, Japan.As of 2005, the city has an estimated population of 300,740 and a population density of 588.11 persons per km². The total area is 489.15 km²....
  
  .

• On February 20, 2006 - the cities 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...
  
   and Mizusawa
  Mizusawa, Iwate
  Mizusawa was a city located in Iwate Prefecture, Japan.As of 2003, the city had an estimated population of 60,979 and a population density of 629.17 persons per km². The total area was 96.92 km².The city was founded on April 1, 1954....
  
   and the municipaltites of Maesawa
  Maesawa, Iwate
  was a town located in Isawa District, Iwate, Japan.As of 2003, the town had an estimated population of 15,215 and a density of 210.33 persons per km²...
  
  , Isawa
  Isawa, Iwate
  was a town in Isawa District, Iwate, Japan.On February 20, 2006 Isawa was merged with the cities of Esashi and Mizusawa, the town of Maesawa, and the village of Koromogawa, all from Isawa District, to form the new city of Ōshū....
  
   and Koromogawa
  Koromogawa, Iwate
  Koromogawa was a village located in Isawa District, Iwate, Japan.On February 20, 2006 Koromogawa was merged with the cities of Esashi and Mizusawa, and the towns of Maesawa and Isawa, all from Isawa District, to form the new city of Ōshū.As of 2003, the village had an estimated population of 5,049...
  
   from Isawa District
  Isawa District, Iwate
  is a district located in Iwate Prefecture, Japan.As of October 31, 2006, the district has an estimated population of 16,433 and a density of 91 persons per km²...
  
   merged to form the new city of Ōshū
  Oshu, Iwate
  is the second largest city in Iwate Prefecture, Japan with a population of 127,804.The city was founded on February 20, 2006, as the result of a merger between the cities of Esashi and Mizusawa, the towns of Maesawa and Isawa and the village of Koromogawa from Isawa District...
  
  .

• On March 6, 2006 - the village of Yamagata
  Yamagata, Iwate
  Yamagata was a village located in Kunohe District, Iwate, Japan.As of 2003, the village has an estimated population of 3,188 and a density of 10.79 persons per km². The total area is 295.49 km²....
  
   from 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....
  
   merged with the old city of Kuji
  Kuji, Iwate
  is a city located in Iwate, Japan.-History:The city was founded on November 3, 1954. In 2003, the city had an estimated population of 36,596 and the population density of 111.70 persons per km²...
  
   to form the new city of Kuji
  Kuji, Iwate
  is a city located in Iwate, Japan.-History:The city was founded on November 3, 1954. In 2003, the city had an estimated population of 36,596 and the population density of 111.70 persons per km²...
  
  .

• On January 1, 2010 - the city of Miyako
  Miyako, Iwate
  is a city located in Iwate, Japan.It was founded on February 11, 1941.The city lies along the coast where the flows into the Pacific Ocean. It is connected to Morioka by an east-west train line and highway and the coastal highway also goes through the town...
  
   and the village of Kawai
  Kawai, Iwate
  Kawai was a village located in Shimohei District, Iwate, Japan.As of 2003, the village had an estimated population of 3,469 and a density of 6.16 persons per km². The total area was 563.07 km²....
  
   in 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...
  
   merged to form the new city of Miyako
  Miyako, Iwate
  is a city located in Iwate, Japan.It was founded on February 11, 1941.The city lies along the coast where the flows into the Pacific Ocean. It is connected to Morioka by an east-west train line and highway and the coastal highway also goes through the town...
  
  .

• On September 26, 2011 - the town of Fujisawa
  Fujisawa, Iwate
  was a town located in Higashiiwai District, Iwate, Japan.As of 2003, the town had an estimated population of 10,057 and a density of 81.64 persons per km². The total area was 123.15 km²....
  
   from 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...
  
   merged with 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:...
  
  . 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...
  
  was dissolved as a result of this merger.