Classification: County
Located in: Illinois (IL)
Total Population (2000): 31334
Total Housing Units (2000): 13362
Land Area (square meters): 2891534000
Water Area (square meters): 4151211
Land Area (square miles): 1116.427566
Water Area (square miles): 1.602792
Latitude (decimal degrees): 40.749055
Longitude (decimal degrees): -87.833796
FIPS Code: 17
Place FIPS Code: 75