Classification: County
Located in: Illinois (IL)
Total Population (2000): 54544
Total Housing Units (2000): 19519
Land Area (square meters): 830294774
Water Area (square meters): 5414036
Land Area (square miles): 320.578618
Water Area (square miles): 2.090371
Latitude (decimal degrees): 41.641529
Longitude (decimal degrees): -88.424929
FIPS Code: 17
Place FIPS Code: 93