Boulder, MT -- U.S. town in Montana Population (2000): 1300 Housing Units (2000): 568 Land area (2000): 1.137662 sq. miles (2.946530 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 1.137662 sq. miles (2.946530 sq. km) FIPS code: 08575 Located within: Montana (MT), FIPS 30 Location: 46.236300 N, 112.121823 W ZIP Codes (1990): 59632 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Boulder, MT Boulder