Classification: County
Located in: Illinois (IL)
Total Population (2000): 38250
Total Housing Units (2000): 16240
Land Area (square meters): 2241955768
Water Area (square meters): 43952645
Land Area (square miles): 865.623998
Water Area (square miles): 16.970212
Latitude (decimal degrees): 40.499297
Longitude (decimal degrees): -90.177649
FIPS Code: 17
Place FIPS Code: 57