Walnut, MS -- U.S. town in Mississippi Population (2000): 754 Housing Units (2000): 341 Land area (2000): 5.420013 sq. miles (14.037768 sq. km) Water area (2000): 0.024984 sq. miles (0.064708 sq. km) Total area (2000): 5.444997 sq. miles (14.102476 sq. km) FIPS code: 77480 Located within: Mississippi (MS), FIPS 28 Location: 34.949109 N, 88.909812 W ZIP Codes (1990): 38683 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Walnut, MS Walnut