Classification: County
Located in: Illinois (IL)
Total Population (2000): 16957
Total Housing Units (2000): 7109
Land Area (square meters): 1453046630
Water Area (square meters): 20355646
Land Area (square miles): 561.024464
Water Area (square miles): 7.859359
Latitude (decimal degrees): 41.201226
Longitude (decimal degrees): -90.73032
FIPS Code: 17
Place FIPS Code: 131