Classification: County
Located in: Illinois (IL)
Total Population (2000): 15371
Total Housing Units (2000): 7393
Land Area (square meters): 1281708431
Water Area (square meters): 17680413
Land Area (square miles): 494.870413
Water Area (square miles): 6.826446
Latitude (decimal degrees): 38.104078
Longitude (decimal degrees): -88.180096
FIPS Code: 17
Place FIPS Code: 193