Naka-ku, Okayama
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Naka-ku (中区) is one of four wards of Okayama, Okayama Prefecture, Japan. The ward has an area of 51.24 km2 (19.78 sq mi) and a population of 138,949. The population density is 2,711 inhabitants per square kilometer (7,020/sq mi). The name means "Central Ward."
The wards of Okayama were established when Okayama became a city designated by government ordinance on April 1, 2009.