Mendon, IL -- U.S. village in Illinois Population (2000): 883 Housing Units (2000): 373 Land area (2000): 0.731260 sq. miles (1.893954 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.731260 sq. miles (1.893954 sq. km) FIPS code: 48307 Located within: Illinois (IL), FIPS 17 Location: 40.088241 N, 91.284458 W ZIP Codes (1990): 62351 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Mendon, IL Mendon