Lewistown, MT -- U.S. city in Montana Population (2000): 5813 Housing Units (2000): 2868 Land area (2000): 1.902575 sq. miles (4.927647 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 1.902575 sq. miles (4.927647 sq. km) FIPS code: 43375 Located within: Montana (MT), FIPS 30 Location: 47.064615 N, 109.429882 W ZIP Codes (1990): 59457 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Lewistown, MT Lewistown