Classification: County
Located in: Illinois (IL)
Total Population (2000): 36062
Total Housing Units (2000): 14310
Land Area (square meters): 1878683655
Water Area (square meters): 10158806
Land Area (square miles): 725.363845
Water Area (square miles): 3.922337
Latitude (decimal degrees): 41.774245
Longitude (decimal degrees): -89.352013
FIPS Code: 17
Place FIPS Code: 103