Koori is a town located in Fukushima Prefecture, Japan. As of 1 April 2020, the town had an estimated population of 11,679 in 4599 households, and a population density of 270 persons per km2. The total area the town was 42.97 square kilometres (16.59 sq mi).

Fukushima Prefecture is a prefecture of Japan located in the Tōhoku region of Honshu. Fukushima Prefecture has a population of 1,771,100 and has a geographic area of 13,783.90 square kilometres (5,321.99 sq mi). Fukushima Prefecture borders Miyagi Prefecture and Yamagata Prefecture to the north, Niigata Prefecture to the west, Gunma Prefecture to the southwest, and Tochigi Prefecture and Ibaraki Prefecture to the south.