is a city located in Okayama Prefecture, Japan. The city was founded on April 1, 1952. The municipal district also includes 31 outlying islands including seven inhabited islands in the Kasaoka Islands group. As of February 28, 2017, the city has an estimated population of 50,160, with 22,446 households and a population density of 370 persons per km². The total area is 136.03 km². Geography Climate Kasaoka has a humid subtropical climate (Köppen climate classification Cfa). The average annual temperature in Kasaoka is . The average annual rainfall is with July as the wettest month. The temperatures are highest on average in August, at around , and lowest in January, at around . The highest temperature ever recorded in Kasaoka was on 5 August 2021; the coldest temperature ever recorded was on 27 February 1981. Demographics Per Japanese census data, the population of Kasaoka in 2020 is 46,088 people. Kasaoka has been conducting censuses since 1950. Landmarks and local cultural facilities Kasaoka is the location of a protected horseshoe crab breeding habitat and the city features a Horseshoe Crab Museum. Chikkyo Art Museum In culinary terms, Kasaoka city is known for its abundance of sea food and a local specialty of chicken based ramen. Crime and safety The Asano-gumi yakuza syndicate is based in Kasaoka. The Asano-gumi is the only designated yakuza group based in Okayama Prefecture. Sister cities Kasaoka is twinned with: Ōda, Shimane, Japan Kota Bharu, Kelantan, Malaysia Mörbylånga, Sweden References External links Kasaoka City official website Cities in Okayama Prefecture