Classification: County
Located in: Illinois (IL)
Total Population (2000): 904161
Total Housing Units (2000): 335621
Land Area (square meters): 864034248
Water Area (square meters): 7636291
Land Area (square miles): 333.605502
Water Area (square miles): 2.948389
Latitude (decimal degrees): 41.856029
Longitude (decimal degrees): -88.063587
FIPS Code: 17
Place FIPS Code: 43