Yamagata is the capital city of Yamagata Prefecture located in the Tōhoku region of northern Japan. As of 1 August 2023, the city had an estimated population of 242,505 in 103,165 households, and a population density of 636 persons per km². The total area of the city is 381.58 square kilometres (147 sq mi).

Yamagata Prefecture is a prefecture of Japan located in the Tōhoku region of Honshu. Yamagata Prefecture has a population of 1,028,055 and has a geographic area of 9,325 km2. Yamagata Prefecture borders Akita Prefecture to the north, Miyagi Prefecture to the east, Fukushima Prefecture to the south, and Niigata Prefecture to the southwest.