As of 2003[update], the district comprises the former districts of Motosu, Mushiroda (席田郡), parts of Katagata (方県郡), and parts of Ōno (大野郡, not to be confused with
Ōno District in Hida region)
May 1, 2003-The towns of
Sunami and
Hozumi merged to form the new city of
Mizuho.