Clay County, Illinois

Clay County
Clay County
County
	Clay County Courthouse in Louisville
	Location within the U.S. state of Illinois
	Illinois's location within the U.S.
	Coordinates: 38°46′N 88°29′W / 38.76°N 88.49°W
Country	United States
State	Illinois
Founded	December 23, 1824 (created); March 8, 1825 (organized)
Named for	Henry Clay
Seat	Louisville
Largest city	Flora
Area
• Total	469.59 sq mi (1,216.2 km2)
• Land	468.32 sq mi (1,212.9 km2)
• Water	1.28 sq mi (3.3 km2) 0.3%
Population (2020)
• Total	13,288
• Density	28/sq mi (11/km2)
Time zone	UTC−6 (Central)
• Summer (DST)	UTC−5 (CDT)
Congressional district	12th
Website	claycountyillinois.org

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.^[1] Since 1842, its county seat has been Louisville, in the center of the county's area.^[2]

^ "Clay County, Illinois". United States Census Bureau. Retrieved June 8, 2023.
^ "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved June 7, 2011.
^ "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.