ZIP code · Colstrip · Montana · United States

ZIP code 59323 — Colstrip

ZIP code 59323 serves Colstrip, Montana.

Postal code
59323
Single source Value from one source, not cross-checked.
City
Colstrip
County
Rosebud FIPS 30087
State
Montana
Country
United States
Coordinates
45.9344, -106.6368 — precision precise (locality)
View on OpenStreetMap
Population
2,156 (ZCTA, ACS 5-year)
Population density
40 / sq mi
Land area
53.4 sq mi (138.2 km²) (ZCTA, ACS 5-year)
Median household income
$86,000
Per-capita income
$44,721
Median age
43.5
Households
886
Housing units
980
Median home value
$193,700
Median gross rent
$632 / month
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
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 85°F), coldest Jan (avg low 14°F).

JanFebMarAprMayJunJulAugSepOctNovDec
Avg high °F363747556575858473584637
Avg low °F141524324251575546342415
Precip in0.70.70.91.93.12.51.41.01.41.40.70.6

NOAA 1991–2020 climate normals from the nearest station: COLSTRIP (2.8 mi) · NOAA NCEI

Places in ZIP 59323

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