Classification: County
Located in: Illinois (IL)
Total Population (2000): 13695
Total Housing Units (2000): 5784
Land Area (square meters): 973578443
Water Area (square meters): 20281035
Land Area (square miles): 375.900754
Water Area (square miles): 7.830552
Latitude (decimal degrees): 39.975926
Longitude (decimal degrees): -90.269918
FIPS Code: 17
Place FIPS Code: 17