The area of the former Hosono village became Oaza Hosono, Keihoku Town, and the other forty-one Oaza (one town and four villages) became the Oaza in Keihoku Town, therefore, there were forty-two Oaza in the Keihoku Town at the time of establishment.
旧細野村の区域は京北町大字細野となり、残りのの1町4村の計41の大字は引き続き京北町の大字となり、発足当初の京北町は42の大字で構成されていた。