Uenohara is a city located in Yamanashi Prefecture, Japan. As of 1 July 2019, the city had an estimated population of 23,158 in 9987 households, and a population density of 140 persons per km². The total area of the city is 170.57 square kilometres (65.86 sq mi).

Yamanashi Prefecture is a prefecture of Japan located in the Chūbu region of Honshu. Yamanashi Prefecture has a population of 817,192 and has a geographic area of 4,465 km2. Yamanashi Prefecture borders Saitama Prefecture to the northeast, Nagano Prefecture to the northwest, Shizuoka Prefecture to the southwest, Kanagawa Prefecture to the southeast, and Tokyo to the east.