In some cities, it occurred that the extent of the area became completely matched with that of the old provinces through mergers; Sado City, Tsushima City, and Iki City are the city names given after the extent of the area became completely matched with that of the respective province.
以上と異なり、合併によって旧国の範囲と完全に一致するようになって付けられたのが、佐渡市、対馬市、壱岐市である。