Classification: County
Located in: Illinois (IL)
Total Population (2000): 19922
Total Housing Units (2000): 8005
Land Area (square meters): 1079667857
Water Area (square meters): 1442988
Land Area (square miles): 416.862108
Water Area (square miles): 0.557141
Latitude (decimal degrees): 39.769979
Longitude (decimal degrees): -88.236661
FIPS Code: 17
Place FIPS Code: 41