Kōriyama (郡山市 Kōriyama-shi?) is a city in the center of the Nakadōri region of Fukushima Prefecture, Japan. As of May 2011, the city has an estimated population of 336,328 and a population density of 440 persons per km². The total area is 757 km². The city was founded on September 1, 1924. It is now designated as a "core city" and functions as a commercial city in Fukushima Prefecture. Kōriyama is the second largest conurbation in the Tōhoku region.
Kōriyama is located in the center of Fukushima Prefecture in the Tōhoku region. The Adatara mountains are to the north, Lake Inawashiro is to the west, and the Abukuma highlands are to the east. The Abukuma River flows through downtown Kōriyama. The downtown area is in front (West) of Kōriyama Station.