Clinton County, Illinois

Clinton County
Clinton County Courthouse
Map of Illinois highlighting Clinton County
Location within the U.S. state of Illinois
Map of the United States highlighting Illinois
Illinois's location within the U.S.
Coordinates: 38°37′N 89°25′W / 38.61°N 89.42°W / 38.61; -89.42
Country United States
State Illinois
Founded1824
Named forDeWitt Clinton
SeatCarlyle
Largest cityBreese
Area
 • Total503 sq mi (1,300 km2)
 • Land474 sq mi (1,230 km2)
 • Water29 sq mi (80 km2)  5.8%
Population
 (2020)
 • Total36,899
 • Estimate 
(2023)
36,785 Decrease
 • Density73/sq mi (28/km2)
Time zoneUTC−6 (Central)
 • Summer (DST)UTC−5 (CDT)
Congressional district12th
Websitewww.clintonco.illinois.gov

Clinton County is a county located in the U.S. state of Illinois. At the 2020 census, the population was 36,899.[1] Its county seat is Carlyle.[2] In 1960, the United States Census Bureau placed the mean center of U.S. population in Clinton County.[3] Clinton County is part of the St. Louis, MO-IL Metropolitan Statistical Area.

  1. ^ "Clinton County, Illinois". United States Census Bureau. Retrieved June 8, 2023.
  2. ^ "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved June 7, 2011.
  3. ^ "Mean Center of Population for the United States: 1790 to 2000" (PDF). US Census Bureau. Archived from the original (PDF) on November 3, 2001. Retrieved September 17, 2011.