Classification: County
Located in: Illinois (IL)
Total Population (2000): 22289
Total Housing Units (2000): 12003
Land Area (square meters): 1556790300
Water Area (square meters): 45674718
Land Area (square miles): 601.080121
Water Area (square miles): 17.635108
Latitude (decimal degrees): 42.393139
Longitude (decimal degrees): -90.235822
FIPS Code: 17
Place FIPS Code: 85