Big Arm, Montana

Coordinates: 47°48′8″N 114°16′51″W / 47.80222°N 114.28083°W / 47.80222; -114.28083
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Big Arm, Montana
Flathead Lake from Big Arm
Flathead Lake from Big Arm
Location of Big Arm, Montana
Location of Big Arm, Montana
Coordinates: 47°48′8″N 114°16′51″W / 47.80222°N 114.28083°W / 47.80222; -114.28083
CountryUnited States
 • Total5.42 sq mi (14.03 km2)
 • Land5.42 sq mi (14.03 km2)
 • Water0.00 sq mi (0.00 km2)
2,953 ft (900 m)
 • Total218
 • Density40.23/sq mi (15.53/km2)
Time zoneUTC-7 (Mountain (MST))
 • Summer (DST)UTC-6 (MDT)
ZIP code
Area code406
FIPS code30-05800
GNIS feature ID0768742

Big Arm is a census-designated place (CDP) in Lake County, Montana, United States. The population was 177 at the 2010 census,[2] up from 131 in 2000.

The town is situated on the south side of Big Arm, a large bay on Flathead Lake, hence its name. The name was used by the Kootenai people, who lived there prior to the town being established.[3] The post office opened in 1911, with Marion F. Lamb as postmaster.[4]

Big Arm State Park is located just north of the town.


Big Arm is located in northwestern Lake County at 47°48′8″N 114°16′51″W / 47.80222°N 114.28083°W / 47.80222; -114.28083 (47.802296, -114.280952).[5] The census-designated place contains the settlement of Big Arm along the southern shore of Flathead Lake's Big Arm, as well as undeveloped grassland to the south, up to the base of an unnamed 5,100-foot (1,600 m) mountain. The CDP is bordered to the northeast by the community of Lindisfarne.

U.S. Route 93 passes through Big Arm, running just south of the lake shore. The highway leads southeast 12 miles (19 km) to Polson, the Lake county seat, and northwest 4 miles (6 km) to Elmo. The city of Kalispell is 39 miles (63 km) north of Big Arm.

According to the United States Census Bureau, the CDP has a total area of 5.4 square miles (14.0 km2), all land.[6]


This climatic region is typified by large seasonal temperature differences, with warm to hot (and often humid) summers and cold (sometimes severely cold) winters. According to the Köppen Climate Classification system, Big Arm has a humid continental climate, abbreviated "Dfb" on climate maps.[7]


Historical population
U.S. Decennial Census[8]
Big Arm postmark

As of the census[9] of 2000, there were 131 people, 56 households, and 39 families residing in the CDP. The population density was 24.0 inhabitants per square mile (9.3/km2). There were 124 housing units at an average density of 22.8 per square mile (8.8/km2). The racial makeup of the CDP was 69.47% White and 30.53% Native American.

There were 56 households, out of which 23.2% had children under the age of 18 living with them, 53.6% were married couples living together, 8.9% had a female householder with no husband present, and 28.6% were non-families. 21.4% of all households were made up of individuals, and 7.1% had someone living alone who was 65 years of age or older. The average household size was 2.34 and the average family size was 2.60.

In the CDP, the population was spread out, with 19.8% under the age of 18, 9.2% from 18 to 24, 18.3% from 25 to 44, 29.8% from 45 to 64, and 22.9% who were 65 years of age or older. The median age was 47 years. For every 100 females there were 111.3 males. For every 100 females age 18 and over, there were 110.0 males.

The median income for a household in the CDP was $29,000, and the median income for a family was $38,750. Males had a median income of $16,750 versus $21,875 for females. The per capita income for the CDP was $16,620. There were no families and 8.0% of the population living below the poverty line, including no under eighteens and 30.0% of those over 64.

See also[edit]


  1. ^ "ArcGIS REST Services Directory". United States Census Bureau. Retrieved September 5, 2022.
  2. ^ "Total Population: 2010 Census DEC Summary File 1 (P1), Big Arm CDP, Montana". U.S. Census Bureau. Retrieved April 15, 2020.
  3. ^ "Montana Place Names Companion". Montana Historical Society. Retrieved July 22, 2017.
  4. ^ Carkeek Cheney, Roberta (1983). Names on the Face of Montana. Missoula, Montana: Mountain Press Publishing Company. p. 5. ISBN 0-87842-150-5.
  5. ^ "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. February 12, 2011. Retrieved April 23, 2011.
  6. ^ "U.S. Gazetteer Files: 2019: Places: Montana". U.S. Census Bureau Geography Division. Retrieved April 15, 2020.
  7. ^ Climate Summary for Big Arm, Montana
  8. ^ "Census of Population and Housing". Retrieved June 4, 2016.
  9. ^ "U.S. Census website". United States Census Bureau. Retrieved January 31, 2008.

External links[edit]

Media related to Big Arm, Montana at Wikimedia Commons