Mergers
- On February 1, 1991 the towns of Akita, Kawachi, Tenmei and Hokubu, all from Hōtaku District, were merged into Kumamoto.
- On October 6, 2008 the town of Tomiai, from Shimomashiki District, was merged into Kumamoto.
- On March 23, 2010 the town of Jōnan, also from Shimomashiki District; and the town of Ueki, from Kamoto District, were merged into Kumamoto.
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