ZIP code · Hamilton · Montana · United States

ZIP code 59840 — Hamilton

ZIP code 59840 serves Hamilton, Montana.

Postal code
59840
Single source Value from one source, not cross-checked.
City
Hamilton
County
Ravalli FIPS 30081
State
Montana
Country
United States
Coordinates
46.2395, -114.1679 — precision precise (locality)
View on OpenStreetMap
Population
14,775 (ZCTA, ACS 5-year)
Population density
27 / sq mi
Land area
537.4 sq mi (1,391.8 km²) (ZCTA, ACS 5-year)
Median household income
$64,493
Per-capita income
$37,625
Median age
49.1
Households
6,464
Housing units
7,287
Median home value
$398,800
Median gross rent
$1,054 / month
Congressional district
MT-1 (119th Congress)
USDA hardiness zone
5b (-15 to -10 °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
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 84°F), coldest Dec (avg low 18°F).

JanFebMarAprMayJunJulAugSepOctNovDec
Avg high °F353949566673848272574334
Avg low °F192025313845504840312318
Precip in1.01.21.01.11.51.60.80.80.80.91.41.3

NOAA 1991–2020 climate normals from the nearest station: HAMILTON (0.4 mi) · NOAA NCEI

Places in ZIP 59840

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