Seta District(~1878) • July 22, 1878 - Due to land reforms, Seta District split into Kitaseta and Minamiseta Districts.
Seta District(1896~2009) • April 1, 1896 - The district was formed when Higashigunma and Minamiseta Districts merged. (17 villages) • May 24, 1899 - The village of Ōgo was elevated to town status to become the
town of Ōgo. (1 town, 16 villages) • April 1, 1901 - Parts of the village of Kamikawabuchi was merged into the
city of Maebashi. • April 1, 1951 - Parts of Mitsumata, village of Kaigaya, was merged into the city of Maebashi. • April 1, 1954 - The villages of Kamikawabuchi, Shimokawabuchi, Haga, and Kaigaya were merged into the city of Maebashi. (1 town, 12 villages) • September 1, 1954 - The village of Nankitsu was merged into the city of Maebashi. (1 town, 11 villages) • April 1, 1955 - Parts of the village of Kise was merged into the city of Maebashi. • September 1, 1956 - The villages of Yokono and Shikishima were merged to create the
village of Akagi. (1 town, 10 villages) • February 20, 1957 - The villages of Kise and Arato were merged to create the
village of Jōnan. (1 town, 9 villages) • February 1, 1958 - Parts of the
village of Kurohone was merged into the town of
town of Ōmama (in
Yamada District). • April 1, 1960 - Parts of the village of Jōnan was merged into the city of Maebashi. • May 1, 1967 - The village of Jōnan was merged into the city of Maebashi. (1 town, 8 villages) • December 5, 2004 - The town of Ōgo, and the villages of
Kasukawa and
Miyagi were merged into the expanded city of Maebashi. (6 villages) • June 13, 2005 - The villages of Kurohone and
Niisato were merged into the
city of Kiryū. (4 villages) • February 20, 2006 - The villages of Akagi and Kitatachibana, the
town of Ikaho, and the villages of
Komochi and
Onogami (both from
Kitagunma District), were merged into the expanded
city of Shibukawa. (2 villages) • March 27, 2006 - The
village of Azuma was merged with the town of Omama (from Yamada District), and the
town of Kasakake (from
Nitta District), to create the
city of Midori. (1 village) • May 5, 2009 - The
village of Fujimi was merged into the expanded city of Maebashi. Seta District was dissolved as a result of this merger. == References ==