| | Description: | Monroe County, located in southwestern Illinois, covers an area of 388 square miles and had a 2003 population of 29,723, according to estimates by the U.S. Department of Commerce's Bureau of the Census. Using these figures, Monroe County was the 28th smallest county in Illinois geographically, but 51st largest in terms of population. Combining these two measures, Monroe County had the 31st highest population density per square mile among Illinois 102 counties. | |
