Kammala jumla mai zuwa: Yankin Kagamiishi na yau yana cikin tsohuwar lardin Mutsu kuma ya kasance wani ɓangare na mallakar Shirakawa Domain a lokacin Edo. Bayan Maido da Meiji, an shirya shi a matsayin wani ɓangare na Gundumar Iwase a yankin Nakadōri na Lardin Iwashiro. An kafa ƙauyen Kagamiishi a ranar 1 ga Afrilu, 1889 tare da ƙirƙirar tsarin birni na zamani. An daukaka matsayin gari a ranar 1 ga Agusta, 1962. A lokacin da
2011 Tohoku girgizar kasa, fiye da 1000 gine-gine da aka tsanani lalace ko hallaka, daidai da kimanin kashi 23 cikin dari na gari,