Classification: County
Located in: Illinois (IL)
Total Population (2000): 51020
Total Housing Units (2000): 21270
Land Area (square meters): 2132110339
Water Area (square meters): 6176134
Land Area (square miles): 823.212439
Water Area (square miles): 2.384619
Latitude (decimal degrees): 41.351751
Longitude (decimal degrees): -90.120495
FIPS Code: 17
Place FIPS Code: 73