Classification: County
Located in: Illinois (IL)
Total Population (2000): 55836
Total Housing Units (2000): 23717
Land Area (square meters): 1855158547
Water Area (square meters): 8851277
Land Area (square miles): 716.28075
Water Area (square miles): 3.417497
Latitude (decimal degrees): 40.939735
Longitude (decimal degrees): -90.290825
FIPS Code: 17
Place FIPS Code: 95