WEBKanagawa Prefecture (神奈川県, Kanagawa-ken) is a prefecture of Japan located in the Kantō region of Honshu. [2] Kanagawa Prefecture is the second-most populous prefecture of Japan at 9,221,129 (1 April 2022) and third-densest at 3,800 inhabitants per square kilometre (9,800/sq mi). Its geographic area of 2,415 km 2 (932 sq mi) makes it ...