ZIP Code 59910
About Big Arm
Big Arm is a census-designated place (CDP) in Lake County, Montana, United States. As of the 2020 census, Big Arm had a population of 218.
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Area Profile
US Census (ACS 5-year · Gazetteer)
605
population
$95,227
median household income
31
people / sq mi
$606,200
median home value
41.9
median age
454
housing units
278
households
19.3
land area (sq mi)