Carthage, IL -- U.S. city in Illinois Population (2000): 2725 Housing Units (2000): 1314 Land area (2000): 1.604858 sq. miles (4.156564 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 1.604858 sq. miles (4.156564 sq. km) FIPS code: 11527 Located within: Illinois (IL), FIPS 17 Location: 40.414327 N, 91.133472 W ZIP Codes (1990): 62321 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Carthage, IL Carthage