• In accordance with 1878 Land Reforms, the district was founded after breaking off from the
Uwa District. (1 town, 22 villages) • February 1898 — The village of Hirano was reassigned to the
Kita District (now the city of
Ōzu). (1 town, 21 villages) • August 1, 1914 — The village of Kawanoishi gained town status. (2 towns, 20 villages) • September 3, 1921 — The village of Mikame gained town status. (3 towns, 19 villages) • July 1, 1928 — The village of Kamiyama gained town status. (4 towns, 18 villages) • January 1, 1930 — The village of Yanozaki merged into the town of
Yawatahama. (4 towns, 17 villages) • February 11, 1935 — The villages of Senjō, Shitada, and the town of Kamiyama merged into city of Yawatahama. (2 towns, 15 villages) • January 1, 1955 — The villages of Nikifu, Mishima, Izumi and parts of Fukigawa in the village of Futaiwa merged into the town of Mikame. (2 towns, 13 villages) • February 1, 1955 — The villages of Futaiwa (excluding parts), Hizuchi, Maana and Kawakami merged into the city of Yawatahama. (2 towns, 9 villages) • March 31, 1955 • The villages of Isotsu, Miyauchi, Kawanoishi, and Kisuki merged to become the town of
Honai. (2 towns, 6 villages) • The villages of Ikata and Machimi merged to become the town of Ikata. (3 towns, 4 villages) • The villages of Kanmatsu and Misaki merged to become the town of
Misaki. (4 towns, 2 villages) • June 1, 1956 — The villages of Mitsukue and Yotsuhama merged to become the town of
Seto. (5 towns) • April 1, 2004 — The town of
Mikame merged with the towns of
Uwa,
Nomura,
Akehama, and
Shirokawa from
Higashiuwa District to form the city of
Seiyo. (4 towns) • March 28, 2005 — The town of Honai merged into the city of Yawatahama. (3 towns) • April 1, 2005 — The towns of Seto, and Misaki merged into the town of Ikata. (1 town) == References ==