Clay 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 |
• Estimate (2023) | 12,999  |
| • Density | 28/sq mi (11/km2) |
| Time zone | UTC−6 (Central) |
| • Summer (DST) | UTC−5 (CDT) |
| Congressional district | 12th |
| Website | claycountyillinois |
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] In 1950, the U.S. Census Bureau placed the mean center of U.S. population in Clay County.[3]
- ^ "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.