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Prior to its dissolution, the district consisted of two towns and two villages:
- Classified as a village.
- Classified as a town.
- On April 1, 2005 - The villages of Nagawa, Azumi and Azusagawa were merged into the expanded city of Matsumoto.
- On October 1, 2005 - The towns of Hotaka and Toyoshina, and the villages of Horigane and Misato, along with the town of Akashina (from Higashichikuma District) were merged to form the city of Azumino. Minamiazumi District was dissolved as a result of this merger.