Classification: County
Located in: Illinois (IL)
Total Population (2000): 49019
Total Housing Units (2000): 21097
Land Area (square meters): 2236646294
Water Area (square meters): 10458238
Land Area (square miles): 863.573999
Water Area (square miles): 4.037948
Latitude (decimal degrees): 39.231191
Longitude (decimal degrees): -89.877556
FIPS Code: 17
Place FIPS Code: 117