Classification: County
Located in: Illinois (IL)
Total Population (2000): 16674
Total Housing Units (2000): 7945
Land Area (square meters): 1150503971
Water Area (square meters): 55830292
Land Area (square miles): 444.212086
Water Area (square miles): 21.556197
Latitude (decimal degrees): 42.076584
Longitude (decimal degrees): -89.953145
FIPS Code: 17
Place FIPS Code: 15