On October 1, 2005 - The old city ofTatsuno (龍野) absorbed the towns ofIbogawa,Mitsu andShingū (all fromIbo District) to create the new and expanded city ofTatsuno (たつの). Tatsuno's written name changed fromkanji (龍野) tohiragana (たつの) with this merger.
On October 24, 2005 - The town ofYokawa (fromMino District) was merged into the expanded city ofMiki.Mino District was dissolved as a result of this merger.