Clark County, Illinois

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Clark County is a county located in the U.S. state of Illinois. As of 2000, the population was 17,008. The U.S. Census Bureau estimates the population to decrease by 0.6% from April 1, 2000 to July 1, 2004, to 16,906. Its county seat is Marshall[1].



Clark County was formed in 1819 out of Crawford County. At the time of its formation, Clark County included about a third of Illinois. It acquired its present boundaries in 1831 as new counties were formed out of it. Clark County was named for George Rogers Clark (older brother of William Clark of the Lewis and Clark Expedition), an officer of the army of Virginia that captured the Northwest Territory from the British at the close of the Revolutionary War.

Clark County from the time of its creation to 1821

Clark between 1821 and 1823

Clark between 1823 and 1830

Clark reduced to its current size in 1830 by the creation of Coles County


According to the U.S. Census Bureau, the county has a total area of 505 square miles (1,307.9 km2), of which 502 square miles (1,300.2 km2) is land and 3 square miles (7.8 km2) (0.67%) is water. Part of the county's eastern border is defined by the Wabash River.

Adjacent counties

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