| | Description: | Clark County, located on the eastern border of Illinois, covers an area of 501 square miles and had a 2003 population of 16,998, according to estimates by the U.S. Department of Commerce's Bureau of the Census. Using these figures, Clark County was the 53rd largest county in Illinois geographically, but 66th largest in terms of population. Combining these two measures, Clark County had the 29th lowest population density per square mile among Illinois 102 counties. | |
