On January 15, 2005, the towns of Misumi and Shiranuhi from Uto District and the towns of Matsubase, Ogawa and Toyono from Shimomashiki District merged to form the new city of Uki.
On January 15, 2005, the city of Yamaga merged with the towns of Kahoku, Kamoto, Kao and Kikuka from KamotoDistrict to form the new city of Yamaga.
On February 11, 2005, the municipalities of Yabe and Seiwa from Kamimashiki District and Soyo from Aso District merged to form the new town of Yamato in Kamimashiki District.