On March 28, 2005, Hōshuyama, along with the village of Koishiwara (also from Asakura District), was merged to create the village of Tōhō.
The village was founded on March 28, 2005 by the merger of the villages of Hōshuyama and Koishiwara, both from Asakura District.
On March 28, 2005, Koishiwara, along with the village of Hōshuyama (also from Asakura District), was merged to create the village of Tōhō.