若狭国
Mihama is part of ancient Wakasa Province. During the Edo period, the area was part of the holdings of Obama Domain. Following the Meiji restoration, it was organised into part of Mikata District in Fukui Prefecture. With the establishment of the modern municipalities system on April 1, 1889, the villages of Kitasaigō, Minamisaigō, Mimi, and Santō were established. The four villages merged to form the town of Mihama on February 11, 1954.