Classification: County
Located in: Illinois (IL)
Total Population (2000): 20452
Total Housing Units (2000): 8785
Land Area (square meters): 1148749411
Water Area (square meters): 5708708
Land Area (square miles): 443.534646
Water Area (square miles): 2.204145
Latitude (decimal degrees): 39.009225
Longitude (decimal degrees): -87.757873
FIPS Code: 17
Place FIPS Code: 33