Classification: County
Located in: Illinois (IL)
Total Population (2000): 183433
Total Housing Units (2000): 78204
Land Area (square meters): 1604555696
Water Area (square meters): 29430618
Land Area (square miles): 619.522444
Water Area (square miles): 11.363226
Latitude (decimal degrees): 40.752492
Longitude (decimal degrees): -89.665063
FIPS Code: 17
Place FIPS Code: 143