Classification: County
Located in: Illinois (IL)
Total Population (2000): 17384
Total Housing Units (2000): 8011
Land Area (square meters): 2150464165
Water Area (square meters): 48107632
Land Area (square miles): 830.298891
Water Area (square miles): 18.574461
Latitude (decimal degrees): 39.629292
Longitude (decimal degrees): -90.886468
FIPS Code: 17
Place FIPS Code: 149