Classification: County
Located in: Illinois (IL)
Total Population (2000): 258941
Total Housing Units (2000): 108942
Land Area (square meters): 1877788394
Water Area (square meters): 39709004
Land Area (square miles): 725.018183
Water Area (square miles): 15.331733
Latitude (decimal degrees): 38.812515
Longitude (decimal degrees): -90.018837
FIPS Code: 17
Place FIPS Code: 119