ZIP code · Sidney · Montana · United States

ZIP code 59270 — Sidney

ZIP code 59270 serves Sidney, Montana.

Postal code
59270
Single source Value from one source, not cross-checked.
City
Sidney
County
Richland FIPS 30083
State
Montana
Country
United States
Coordinates
47.7130, -104.1634 — precision precise (locality)
View on OpenStreetMap
Population
8,844 (ZCTA, ACS 5-year)
Population density
10 / sq mi
Land area
891 sq mi (2,307.8 km²) (ZCTA, ACS 5-year)
Median household income
$68,031
Per-capita income
$39,117
Median age
38.7
Households
3,567
Housing units
4,358
Median home value
$260,600
Median gross rent
$876 / month
Congressional district
MT-2 (119th Congress)
USDA hardiness zone
4a (-30 to -25 °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 87°F), coldest Jan (avg low 7°F).

JanFebMarAprMayJunJulAugSepOctNovDec
Avg high °F273246617179878676594231
Avg low °F71121324352575546342111
Precip in0.50.40.61.22.42.82.61.31.61.10.60.5

NOAA 1991–2020 climate normals from the nearest station: SIDNEY (1.3 mi) · NOAA NCEI

Places in ZIP 59270

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