On October 1, 2004, the town of Ochi and the village of Daiwa (both from Ochi District) merged to form the new town of Misato.
On October 1, 2004, the towns of Hakuta and Hirose from Nogi District merged with the city of Yasugi to form the new city of Yasugi.
On March 31, 2005, the towns of Kashima, Mihonoseki, Shimane, Shinji, Tamayu and Yatsuka and the village of Yakumo (all from Yatsuka District) merged with the city of Matsue to form the new city of Matsue.