Will -- U.S. County in Illinois Population (2000): 502266 Housing Units (2000): 175524 Land area (2000): 836.940601 sq. miles (2167.666114 sq. km) Water area (2000): 12.445816 sq. miles (32.234514 sq. km) Total area (2000): 849.386417 sq. miles (2199.900628 sq. km) Located within: Illinois (IL), FIPS 17 Location: 41.527431 N, 88.029840 W Headwords: Will Will, IL Will County Will County, IL