Helena, MT -- U.S. city in Montana Population (2000): 25780 Housing Units (2000): 12133 Land area (2000): 14.005336 sq. miles (36.273653 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 14.005336 sq. miles (36.273653 sq. km) FIPS code: 35600 Located within: Montana (MT), FIPS 30 Location: 46.595805 N, 112.027031 W ZIP Codes (1990): 59601 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Helena, MT Helena