Clay County
Also known as Clay County, Illinois, Clay County, IL
county in Illinois, United States
Key facts
- Country
- United States
- State
- Illinois
- Founded
- December 23, 1824 (created), March 8, 1825 (organized)
- Named after
- Henry Clay
- Seat
- Louisville
- Largest city
- Flora
- Total
- 469.59 sq mi (1,216.2 km )
- Land
- 468.32 sq mi (1,212.9 km )
- Water
- 1.28 sq mi (3.3 km ) 0.3%
- Estimate 2025
- 12,793
- Density
- 28.374/sq mi (10.955/km )
- Time zone
- UTC−6 ( Central )
- Summer dst
Article
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. In 1950, the U.S. Census Bureau placed the mean center of U.S. population in Clay County.
History