Classification: County
Located in: Illinois (IL)
Total Population (2000): 150433
Total Housing Units (2000): 59972
Land Area (square meters): 3065321876
Water Area (square meters): 7143544
Land Area (square miles): 1183.527443
Water Area (square miles): 2.758138
Latitude (decimal degrees): 40.495251
Longitude (decimal degrees): -88.883582
FIPS Code: 17
Place FIPS Code: 113