McLain, MS -- U.S. town in Mississippi Population (2000): 603 Housing Units (2000): 277 Land area (2000): 3.393415 sq. miles (8.788903 sq. km) Water area (2000): 0.054371 sq. miles (0.140819 sq. km) Total area (2000): 3.447786 sq. miles (8.929722 sq. km) FIPS code: 43840 Located within: Mississippi (MS), FIPS 28 Location: 31.104985 N, 88.823788 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: McLain, MS McLain