| | Description: | Knox County, located in western Illinois, covers an area of 716 square miles and had a 2003 population of 54,491, according to estimates by the U.S. Department of Commerce's Bureau of the Census. Using these figures, Knox County was tied for the 21st largest county in Illinois geographically, but 26th largest in terms of population. Combining these two measures, Knox County had the 33rd highest population density per square mile among Illinois 102 counties. | |
