Map showing original extent of Shimoina District in Nagano Prefecture:
* yellow - areas formerly within the district borders during the early Meiji period
Matsukawa-machi
Takamori-machi
Anan-machi
Achi-mura
Hiraya-mura
Neba-mura
Shimojō-mura
Urugi-mura
Tenryū-mura
Yasuoka-mura
Takagi-mura
Toyooka-mura
Ōshika-mura
Colored areas are in this district.
January 4, 1879 - Ina District was split off into Kamiina and Shimoina Districts during the early Meiji period establishment of the municipalities system, which initially consisted of 1 town and 31 villages. Its district headquarters was located at the village of Iida.
District Timeline
July 1, 1993 - The town of Kamisato was merged into the expanded city of Iida.
Recent mergers
October 1, 2005: The villages of Kami and Minamishinano were merged into the expanded city of Iida.
January 1, 2006: The village of Namiai was merged into the expanded village of Achi.
March 31, 2009: The village of Seinaiji was merged into the expanded village of Achi.[1]
References
^"市町村合併情報 長野県 <国土地理協会>". Archived from the original on 2008-04-18. Retrieved 2008-09-07.