Clinton County is located in the U.S. state of Illinois. At the 2020 census, the population was 36,899. Its county seat is Carlyle.
In 1960, the United States Census Bureau placed the mean center of U.S. population in Clinton County.
Clinton... Wikipedia
Population: 36,909 (2022)
County seat: Carlyle
Congressional district: 12th
Founded: 1824
Largest city: Breese
Named for: DeWitt Clinton