Classification: County
Located in: Illinois (IL)
Total Population (2000): 18293
Total Housing Units (2000): 7894
Land Area (square meters): 1077851694
Water Area (square meters): 15454421
Land Area (square miles): 416.160883
Water Area (square miles): 5.966986
Latitude (decimal degrees): 37.461737
Longitude (decimal degrees): -89.248116
FIPS Code: 17
Place FIPS Code: 181