Classification: County
Located in: Illinois (IL)
Total Population (2000): 16038
Total Housing Units (2000): 7033
Land Area (square meters): 1395854617
Water Area (square meters): 63263298
Land Area (square miles): 538.942504
Water Area (square miles): 24.426097
Latitude (decimal degrees): 40.260702
Longitude (decimal degrees): -89.913299
FIPS Code: 17
Place FIPS Code: 125