Minamiuwa District, Ehime

• 1878 — The Minamiuwa District broke off from the Uwa District through Meiji era land reforms. (7 villages)
• February 11, 1923 — The village of Mishō gained town status. (1 town, 6 villages)
• February 11, 1923 — The village of Jōhen gained town status. (2 towns, 5 villages)
• November 3, 1948 — The village of Uchiumi broke up into Uchiumi and Minamiuchiumi, with some parts merging into Jōhen. (2 towns, 6 villages)
• April 1, 1952 — The village of Higashisotoumi gained town status. (3 towns, 5 villages)
• September 1, 1952 — The village of Midorisōzu merged into the town of Jōhen. (3 towns, 4 villages)
• October 1, 1952 — The village of Nishisotoumi was renamed and gained town status to become the town of Nishiumi. (4 towns, 3 villages)
• September 21, 1956 — The town of Higashisotoumi merged into the town of Jōhen. (3 towns, 3 villages)
• September 30, 1956 — The village of Minamiuchiumi merged into the town of Mishō. (3 towns, 2 villages)
• January 1, 1962 — The village of Ipponmatsu gained town status. (4 towns, 1 village)
• October 1, 2004 — The towns of Ipponmatsu, Mishō, Jōhen and Nishiumi, and the village of Uchiumi merged to form the new town of Ainan.^[1] (1 town)

32°59′38″N 132°35′02″E / 32.994°N 132.584°E / 32.994; 132.584