Classification: County
Located in: Illinois (IL)
Total Population (2000): 12878
Total Housing Units (2000): 5046
Land Area (square meters): 892580171
Water Area (square meters): 11004603
Land Area (square miles): 344.627145
Water Area (square miles): 4.248901
Latitude (decimal degrees): 37.466033
Longitude (decimal degrees): -88.894637
FIPS Code: 17
Place FIPS Code: 87