Naka-ku is one of four wards of Okayama, Okayama Prefecture, Japan. The ward has an area of 51.24 km2 and a population of 138,949. The population density is 2,711 inhabitants per square kilometer. The

A designated city or government ordinance city, short for city designated by government ordinance, is a Japanese city that has a population greater than 500,000 and has been designated as such by orde