Classification: County
Located in: Illinois (IL)
Total Population (2000): 103833
Total Housing Units (2000): 40610
Land Area (square meters): 1752772109
Water Area (square meters): 12162047
Land Area (square miles): 676.749124
Water Area (square miles): 4.695793
Latitude (decimal degrees): 41.137091
Longitude (decimal degrees): -87.84234
FIPS Code: 17
Place FIPS Code: 91