July 22, 1887 - Soo District broke off into Higashisoo and Nishisoo Districts.
Soo District (1897–present)
April 1, 1897 - Higashisoo District and Minamimorokata District merged to form Soo District. The villages of Sueyoshi, Iwagawa, Tsuneyoshi, Takarabe, Ichinari, Higashishibushi, Nishishibushi, Tsukino, Matsuyama, Ōsaki, and Nogata were formed. (11 villages)
July 1, 1913 - The village of Higashishibushi gained town status and renamed to become the town of
Shibushi. (1 town, 10 villages)
October 1, 1922 - The village of Sueyoshi gained town status to become the town of
Sueyoshi. (2 towns, 9 villages)
April 1, 1924 - The village of Iwagawa gained town status to become the town of Iwagawa. (3 towns, 8 villages)
April 1, 1926 - The village of Takarabe gained town status to become the town of
Takarabe. (4 towns, 7 villages)
January 1, 1936 - The village of Ōsaki gained town status to become the town of
Ōsaki. (5 towns, 6 villages)
January 20, 1955 - The town of Iwagawa and the villages of Tsuneyoshi and Tsukino merged to form the town of
Ōsumi. (5 towns, 4 villages)
April 1, 1955 - The village of Nogata split and merged into the towns of Ōsumi, Ōsaki, and the village of Nishishibushi. (5 towns, 3 villages)
April 1, 1956 - The village of Ichinari and the village of Mobiki from
Kimotsuki District to form the town of
Kihoku. (6 towns, 2 villages)
April 1, 1958 (8 towns)
The village of Matsuyama gained town status to become the town of
Matsuyama.
The village of Nishishibushi gained town status and renamed to become the town of
Ariake.
April 1, 1972 - Soo District (囎唹郡) changed their name to Soo District (曽於郡).
July 1, 2005 - The towns of Ōsumi, Sueyoshi, and Takarabe merged to form the city of
Soo.[1][2](5 towns)
January 1, 2006 (1 town)
The towns of Ariake, Matsuyama, and Shibushi merged to form the city of
Shibushi.
The town of Kihoku merged with the city of Kanoya and the towns of
Kushira and
Aira from Kimotsuki District to form the city of
Kanoya.
References
^曽於市役所.
"曽於市公式ホームページ". 鹿児島県曽於市 (in Japanese). Retrieved 2024-02-07.
^データでみる県勢: 日本国勢図会地域統計版 (in Japanese). 国勢社. 2006. p. 123. 曽於市 2005 年 7 月 1 日二大隅町、財部町、末吉町合併して誕生。