Allerton, IL -- U.S. village in Illinois Population (2000): 293 Housing Units (2000): 122 Land area (2000): 0.644832 sq. miles (1.670107 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.644832 sq. miles (1.670107 sq. km) FIPS code: 00880 Located within: Illinois (IL), FIPS 17 Location: 39.912859 N, 87.935636 W ZIP Codes (1990): 61810 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Allerton, IL Allerton