ZIP code · Basin · Montana · United States

ZIP code 59631 — Basin

ZIP code 59631 serves Basin, Montana.

Postal code
59631
Single source Value from one source, not cross-checked.
City
Basin
County
Jefferson FIPS 30043
State
Montana
Country
United States
Coordinates
46.3296, -112.1967 — precision precise (locality)
View on OpenStreetMap
Population
367 (ZCTA, ACS 5-year)
Population density
2 / sq mi
Land area
156.4 sq mi (405.2 km²) (ZCTA, ACS 5-year)
Median household income
$49,375
Per-capita income
$40,377
Median age
54.1
Households
155
Housing units
188
Median home value
$229,300
Congressional district
MT-2 (119th Congress)
USDA hardiness zone
5a (-20 to -15 °F)
Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
Time zone
America/Denver (UTC−7 / UTC−6 DST)
Area code
406 (from the nearest rate centre)
Telephone area codes serving this ZIP (NANPA central-office assignments). A ZIP and an area code are different boundaries; at a border both codes may apply.

Climate — monthly normals

Warmest month Jul (avg high 83°F), coldest Dec (avg low 12°F).

JanFebMarAprMayJunJulAugSepOctNovDec
Avg high °F353847556472838272574234
Avg low °F121421273543484638281912
Precip in0.30.20.40.81.92.31.41.11.10.60.50.3

NOAA 1991–2020 climate normals from the nearest station: BOULDER (7.9 mi) · NOAA NCEI

Places in ZIP 59631

Places mapped inside this ZIP’s ZCTA area in OpenStreetMap. OSM is community-maintained: counts reflect what has been mapped, and completeness varies by area — treat them as at-least figures. © OpenStreetMap contributors (ODbL) · Methodology

About this page

US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.

GeoNames · U.S. Census Bureau (ACS) · U.S. Census Bureau · NOAA NCEI · usda-phzm. Data generated on 2026-08-21. Methodology · Report an error on this page