Circleville is a city in Pickaway County, Ohio, United States, and its county seat. The city is situated along the Scioto River 25 miles (40 km) south of Columbus. The population was 13,927 at the 2020 census.
Circleville is named after its original layout created in 1810, which was based upon the circular Hopewell tradition earthwork within which the city was built. This earthwork measured 1,100 ft (340 m) in diameter, and was constructed in the early centuries of the Common Era. The county courthouse was built in the center of the innermost circle.
