List of mergers in Gunma Prefecture

Here is a list of mergers in Gunma Prefecture, Japan since the Heisei era.

Mergers from April 1, 1999 to Present

• On April 1, 2003 - the town of Manba and the village of Nakasato from Tano District merged to form the new town of Kanna.

• On December 5, 2004 - the town of Ōgo and the villages of Kasukawa and Miyagi from Seta District merged into the expanded city of Maebashi.

• On January 1, 2005 - the towns of Akabori and Sakai and the village of Azuma from Sawa District merged with city of Isesaki to create the new city of Isesaki.

• On February 13, 2005 - the villages of Shirasawa and Tone from Tone District merged into the expanded city of Numata.

• On March 28, 2005 - the towns of Nitta, Ojima, and Yabuzukahonmachi merged with the old city of Ōta to form the city of Ōta.

• On June 13, 2005 - the villages of Niisato and Kurohone from Seta District merged into the expanded city of Kiryū.

• On October 1, 2005 - the village of Niiharu and the former towns of Tsukiyono and Minakami merged to form the new town of Minakami.

• On January 1, 2006 - the town of Onishi merged into the expanded city of Fujioka.

• On January 23, 2006 - the municipalities of Gunma, Kurabuchi and Misato from Gunma District and the town of Shin from Tano District merged into the expanded city of Takasaki.

• On February 20, 2006 - the municipalities of Ikaho, Komochi and Onogami from Kitagunma District and the villages of Akagi and Kitatachibana from Seta District merged with the city of Shibukawa to create the new city of Shibukawa.

• On March 18, 2006 - the town of Matsuida from Usui District merged with the city of An'naka to create the new city of An'naka. Usui District was dissolved as a result of this merger.

• On March 27, 2006 - the towns of Omama and Kasakake and the village of Azuma merged to form the city of Midori. Nitta District and Yamada District were dissolved as a result of this merger.

• On March 27, 2006 - the town of Myōgi from Kanra District merged with the city of Tomioka to create the new city of Tomioka.

• On March 27, 2006 - the towns of Agatsuma and Azuma from Agatsuma District merged to form the new town of Higashiagatsuma.

• On October 1, 2006 - the town of Haruna from Gunma District merged into the city of Takasaki. Gunma District was dissolved as a result of this merger.

• On May 5, 2009 - the village of Fujimi from Seta District merged into the city of Maebashi. Seta District was dissolved as a result of this merger.

• On June 1, 2009 - the town of Yoshii from Tano District merged into the city of Takasaki.

• On March 28, 2010 - the village of Kuni from Agatsuma District merged into the town of Nakanojō.