Classification: County
Located in: Illinois (IL)
Total Population (2000): 36616
Total Housing Units (2000): 15291
Land Area (square meters): 1473074698
Water Area (square meters): 9083856
Land Area (square miles): 568.757345
Water Area (square miles): 3.507297
Latitude (decimal degrees): 39.712954
Longitude (decimal degrees): -90.215325
FIPS Code: 17
Place FIPS Code: 137