Ushiku is a city located in Ibaraki Prefecture, Japan. As of 1 January 2024, the city had an estimated population of 83,826 in 36,380 households and a population density of 1423 persons per km2. The percentage of the population aged over 65 was 29.5%. The total area of the city is 58.92 square kilometres (22.75 sq mi).

Ibaraki Prefecture is a prefecture of Japan located in the Kantō region of Honshu. Ibaraki Prefecture has a population of 2,828,086 and has a geographic area of 6,097.19 square kilometres. Ibaraki Prefecture borders Fukushima Prefecture to the north, Tochigi Prefecture to the northwest, Saitama Prefecture to the southwest, Chiba Prefecture to the south, and the Pacific Ocean to the east.