WebHiroshima Prefecture (広島県, Hiroshima-ken) is a prefecture of Japan located in the Chūgoku region of Honshu. [2] Hiroshima Prefecture has a population of 2,811,410 (1 June 2019) and has a geographic area of 8,479 km² (3,274 sq mi ). Hiroshima Prefecture borders Okayama Prefecture to the east, Tottori Prefecture to the northeast, Shimane ...