Clark County, Illinois

Clark County
Clark County
County
	Clark County Courthouse in Marshall
	Location within the U.S. state of Illinois
	Illinois's location within the U.S.
	Coordinates: 39°20′N 87°47′W / 39.33°N 87.79°W
Country	United States
State	Illinois
Founded	1819
Named for	George Rogers Clark
Seat	Marshall
Largest city	Marshall
Area
• Total	505 sq mi (1,310 km2)
• Land	501 sq mi (1,300 km2)
• Water	3.4 sq mi (9 km2) 0.7%
Population (2020)
• Total	15,455
• Density	31/sq mi (12/km2)
Time zone	UTC−6 (Central)
• Summer (DST)	UTC−5 (CDT)
Congressional district	12th
Website	www.clarkcountyil.org

Clark County is a county located in the southeastern part of U.S. state of Illinois, along the Indiana state line. As of the 2020 census, the population was 15,455.^[1] Its county seat is Marshall.^[2] The county was named for George Rogers Clark, an officer who served in the American Revolution.^[3]

^ "Clark 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.
^ Perrin, p. 237