Big Arm is a community in Lake County, Montana, home to about 190 people across 5.4 square miles. It has no ZIP code of its own: it’s part of 59860 and 59910.
Homes sold for a median of $362 per square foot across 2 ZIP codes in the three months ending August 2026, and 0 of 2 were seller’s markets.
Mostly Polson; part is in Big Arm
Part is in Big Arm, part in Lindisfarne
Each card is that ZIP code’s whole market, including any part outside Big Arm. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Big Arm’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Spokane International Airport (GEG)156 miles away |
|---|---|
| Closer regional airport | Glacier Park International Airport (FCA)41 miles away |
| Nearest city of 250,000+ | Seattle, WA380 miles away |
Straight-line distances from the center of Big Arm; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Big Arm had 218 residents in the 2020 census, up 66% since 2000.
It’s the 257th largest of 475 towns in Montana by population.
Lake County grew from 9,541 residents in 1930 to 31,134 in 2020.
Lake County, 1930–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 83°F in summer, and winter lows average 22°F. About 14.9 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Polson, MT weather station (3 miles away).
7,817 jobs at 991 businesses in Lake County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
185 doctors and other health care providers list an office in Big Arm’s ZIP codes.
Nearest hospitals
Providers with an office here
| Primary care doctors | 27 |
|---|---|
| Specialist doctors | 24 |
| Dentists | 18 |
| Nurse practitioners and physician assistants | 30 |
| Mental health providers | 53 |
| Physical and occupational therapists | 23 |
| Optometrists | 4 |
| Chiropractors | 6 |
| Pharmacies | 11 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (2 nearby)
Grocery stores
Libraries
Museums
Counts are within about 1.5 miles of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by Polson Elem, Valley View Elem, Polson H S. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Cherry Valley SchoolPolson | Pre-K–1 | 243 | Public | 2.1 mi |
| Valley View SchoolPolson | Pre-K–6 | 35 | Public | 7.5 mi |
| Linderman SchoolPolson | 2–4 | 355 | Public | 2.1 mi |
| Polson Middle SchoolPolson | 5–8 | 477 | Public | 2.6 mi |
| Polson High SchoolPolson | 9–12 | 517 | Public | 2.7 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| Mission Valley Christian AcademyPolson | Pre-K–12 | 138 | Christian (no specific denomination) | 5.1 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools; Private School Universe Survey (2023-2024) for private schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Polson, Finley Point, Lindisfarne, Kerr, Pablo, Kings Point, Jette, Rocky Point and Turtle Lake.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.