Basin is a community in Jefferson County, Montana, home to about 352 people across 13 square miles. Its ZIP code is 59631.
Homes sold for a median of $261 per square foot in the three months ending August 2026, a buyer’s market.
Each card is that ZIP code’s whole market, including any part outside Basin. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Basin’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)267 miles away |
|---|---|
| Closer regional airport | Helena Regional Airport (HLN)22 miles away |
| Nearest city of 250,000+ | Seattle, WA487 miles away |
Straight-line distances from the center of Basin; 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.
Basin had 199 residents in the 2020 census, down 22% since 2000.
It’s the 180th largest of 475 towns in Montana by population.
Jefferson County grew from 5,330 residents in 1900 to 12,085 in 2020.
Jefferson County, 1900–2020
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 12°F. About 10.9 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Boulder, MT weather station (8 miles away).
1,959 jobs at 342 businesses in Jefferson County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
1 doctors and other health care providers list an office in Basin.
Nearest hospitals
Providers with an office here
| Dentists | 1 |
|---|
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.
Public schools here are run by Basin Elem. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Basin SchoolBasin | Pre-K–6 | 8 | Public | 5.1 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
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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.