Numata is a city located in Gunma Prefecture, Japan. As of 31 July 2020, the city had an estimated population of 46,908 in 20,589 households, and a population density of 110 persons per km2. The total area of the city is 443.46 square kilometres (171.22 sq mi), making it the largest city in terms of area within Gunma Prefecture.

Gunma Prefecture is a landlocked prefecture of Japan located in the Kantō region of Honshu. Gunma Prefecture has a population of 1,937,626 and has a geographic area of 6,362 km2. Gunma Prefecture borders Niigata Prefecture and Fukushima Prefecture to the north, Nagano Prefecture to the southwest, Saitama Prefecture to the south, and Tochigi Prefecture to the east.