Okayama is the capital city of Okayama Prefecture in the Chūgoku region of Japan. The Okayama metropolitan area, centered around the city, has the largest urban employment zone in the Chugoku region of western Japan. The city was founded on June 1, 1889. As of February 2023, the city has an estimated population of 700,940 and a population density of 890 people per km². The total area is 789.95 square kilometres.