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Towns and villages
- On February 11, 2005 the old town of Aso absorbed the town of Ichinomiya, and the village of Namino to become the new city of Aso.
- On February 11, 2005 the town of Soyō merged with the town of Yabe, and the village of Seiwa, both from Kamimashiki District, to form the new town of Yamato (in Kamimashiki District).
- On February 13, 2005 the villages of Chōyō, Hakusui and Kugino merged to form the new village of Minamiaso.