On November 1, 2004 - the towns ofHikimi andMito (both fromMino District) were merged into the expanded city ofMasuda.Mino District was dissolved as a result of this merger.
On October 1, 2005 - the old city ofŌda absorbed the towns ofNima andYunotsu (both fromNima District) to create the new and expanded city ofŌda.Nima District was dissolved as a result of this merger.