Classification: County
Located in: Illinois (IL)
Total Population (2000): 35535
Total Housing Units (2000): 13805
Land Area (square meters): 1228257056
Water Area (square meters): 75748972
Land Area (square miles): 474.232721
Water Area (square miles): 29.246843
Latitude (decimal degrees): 38.598095
Longitude (decimal degrees): -89.436849
FIPS Code: 17
Place FIPS Code: 27