Classification: County
Located in: Illinois (IL)
Total Population (2000): 10117
Total Housing Units (2000): 4294
Land Area (square meters): 1280499931
Water Area (square meters): 9364378
Land Area (square miles): 494.403808
Water Area (square miles): 3.615607
Latitude (decimal degrees): 39.009625
Longitude (decimal degrees): -88.140296
FIPS Code: 17
Place FIPS Code: 79