| Description: | Morgan County, located in central Illinois, covers an area of 569 square miles and had a 2003 population of 35,990, according to estimates by the U.S. Department of Commerce's Bureau of the Census. Using these figures, Morgan County was the 42nd largest county in Illinois geographically, and 41st largest in terms of population. Combining these two measures, Morgan County also had the 41st highest population density per square mile among Illinois 102 counties. | |