Plymouth, IL -- U.S. village in Illinois Population (2000): 562 Housing Units (2000): 264 Land area (2000): 0.589202 sq. miles (1.526026 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.589202 sq. miles (1.526026 sq. km) FIPS code: 60833 Located within: Illinois (IL), FIPS 17 Location: 40.291228 N, 90.917134 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Plymouth, IL Plymouth