Shelby -- U.S. County in Illinois Population (2000): 22893 Housing Units (2000): 10060 Land area (2000): 758.510902 sq. miles (1964.534133 sq. km) Water area (2000): 9.541609 sq. miles (24.712654 sq. km) Total area (2000): 768.052511 sq. miles (1989.246787 sq. km) Located within: Illinois (IL), FIPS 17 Location: 39.385719 N, 88.799105 W Headwords: Shelby Shelby, IL Shelby County Shelby County, IL