Classification: County
Located in: Illinois (IL)
Total Population (2000): 17008
Total Housing Units (2000): 7816
Land Area (square meters): 1298887932
Water Area (square meters): 8752855
Land Area (square miles): 501.503456
Water Area (square miles): 3.379496
Latitude (decimal degrees): 39.345598
Longitude (decimal degrees): -87.802973
FIPS Code: 17
Place FIPS Code: 23