Classification: County
Located in: Illinois (IL)
Total Population (2000): 12486
Total Housing Units (2000): 5285
Land Area (square meters): 813896761
Water Area (square meters): 2916227
Land Area (square miles): 314.24731
Water Area (square miles): 1.125962
Latitude (decimal degrees): 40.032792
Longitude (decimal degrees): -89.811751
FIPS Code: 17
Place FIPS Code: 129