Classification: County
Located in: Illinois (IL)
Total Population (2000): 12937
Total Housing Units (2000): 5758
Land Area (square meters): 578786625
Water Area (square meters): 11115526
Land Area (square miles): 223.470775
Water Area (square miles): 4.291729
Latitude (decimal degrees): 38.430342
Longitude (decimal degrees): -87.816801
FIPS Code: 17
Place FIPS Code: 185