 On March 20, 2006, Imaichi, along with the town of Ashio (from Kamitsuga District), the town of Fujihara, and the village of Kuriyama (both from Shioya District), was merged into the expanded city of Nikkō.Following this merger, the former Imaichi City Hall became the new Nikkō City Hall.The city was founded on March 31, 1954.