Classification: County
Located in: Illinois (IL)
Total Population (2000): 35469
Total Housing Units (2000): 13487
Land Area (square meters): 1367384872
Water Area (square meters): 38317003
Land Area (square miles): 527.950273
Water Area (square miles): 14.794278
Latitude (decimal degrees): 40.783629
Longitude (decimal degrees): -89.225144
FIPS Code: 17
Place FIPS Code: 203