Tsuruoka is a city in Yamagata Prefecture, Japan. As of 31 January 2020, the city had an estimated population of 125,389 in 49,024 households, and a population density of 95.74 persons per km2. The total area of the city is 1,311.53 square kilometres. Tsuruoka is the biggest city in Tōhoku region in terms of land area.