Classification: County
Located in: Illinois (IL)
Total Population (2000): 83919
Total Housing Units (2000): 36349
Land Area (square meters): 2328606541
Water Area (square meters): 7915927
Land Area (square miles): 899.08005
Water Area (square miles): 3.056357
Latitude (decimal degrees): 40.156797
Longitude (decimal degrees): -87.692434
FIPS Code: 17
Place FIPS Code: 183