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About Big Arm, Montana

Big Arm is a census-designated place (CDP) in Lake County, Montana, United States. The population was 131 at the 2000 census.

News from Big Arm

Big Arm Facts

  • Population Total: 131
  • Square Miles: 5.4
  • Area Code: 406
  • Elevation: 2953
  • Postal Codes: 59910
  • Timezone: Mountain