Kubokawa-cho(39404) in Takaoka-gun, Taisho-cho(39422) and Towa-son(39425) in Hata-gun are merged, and Shimanto-cho(39412) in Takaoka-gun is newly established.
窪川町(39404)、大正町(39422)、十和村(39425)が合併し、四万十町(39412)を新設