Classification: County
Located in: Illinois (IL)
Total Population (2000): 68277
Total Housing Units (2000): 29386
Land Area (square meters): 2218672126
Water Area (square meters): 37924714
Land Area (square miles): 856.634133
Water Area (square miles): 14.642815
Latitude (decimal degrees): 39.965452
Longitude (decimal degrees): -91.268051
FIPS Code: 17
Place FIPS Code: 1