ZIP code · Fairfield · Montana · United States

ZIP code 59436 — Fairfield

ZIP code 59436 serves Fairfield, Montana.

Postal code
59436
Single source Value from one source, not cross-checked.
City
Fairfield
County
Teton FIPS 30099
State
Montana
Country
United States
Coordinates
47.6143, -112.0015 — precision precise (locality)
View on OpenStreetMap
Population
2,093 (ZCTA, ACS 5-year)
Population density
8 / sq mi
Land area
246.9 sq mi (639.6 km²) (ZCTA, ACS 5-year)
Median household income
$78,047
Per-capita income
$31,762
Median age
38.4
Households
823
Housing units
900
Median home value
$271,700
Median gross rent
$871 / month
Congressional district
MT-2 (119th Congress)
USDA hardiness zone
4b (-25 to -20 °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 80°F), coldest Jan (avg low 17°F).

JanFebMarAprMayJunJulAugSepOctNovDec
Avg high °F363645536270807969554335
Avg low °F171724324148535244342518
Precip in0.30.40.61.42.12.61.11.11.20.70.50.3

NOAA 1991–2020 climate normals from the nearest station: FAIRFIELD (0.7 mi) · NOAA NCEI

Places in ZIP 59436

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