Kasaoka is a city located in Okayama Prefecture, Japan. As of 1 March 2023, the city had an estimated population of 45,404 in 21,987 households and a population density of 330 inhabitants per square kilometre (850/sq mi). The total area of the city is 136.24 square kilometres (52.60 sq mi). The municipal district also includes 31 outlying islands including seven inhabited islands in the Kasaoka I…