Clay County, Illinois

Clay County is a county in the southeastern portion of the U.S. state of Illinois. As of the 2020 United States Census, the population was 13,288. Since 1842, its county seat has been Louisville, in the center of the county's area.

Clay County
Location within the U.S. state of Illinois
Illinois's location within the U.S.
Coordinates: 38°46′N 88°29′W
Country United States
State Illinois
Founded23 December 1824 (created)
8 March 1825 (organized)
Named forHenry Clay
SeatLouisville
Largest cityFlora
Area
  Total469.59 sq mi (1,216.2 km2)
  Land468.32 sq mi (1,212.9 km2)
  Water1.28 sq mi (3.3 km2)  0.3%
Population
 (2020)
  Total13,288
  Density28/sq mi (11/km2)
Time zoneUTC−6 (Central)
  Summer (DST)UTC−5 (CDT)
Congressional district12th
Websiteclaycountyillinois.org

In 1950, the U.S. Census Bureau placed the mean center of U.S. population in Clay County.

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