ZIP code · Big Sandy · Montana · United States

ZIP code 59520 — Big Sandy

ZIP code 59520 serves Big Sandy, Montana.

Postal code
59520
Single source Value from one source, not cross-checked.
City
Big Sandy
County
Chouteau FIPS 30015
State
Montana
Country
United States
Coordinates
48.1497, -110.0776 — precision precise (locality)
View on OpenStreetMap
Population
1,211 (ZCTA, ACS 5-year)
Population density
1 / sq mi
Land area
1,120.4 sq mi (2,901.8 km²) (ZCTA, ACS 5-year)
Median household income
$58,667
Per-capita income
$32,235
Median age
40.2
Households
432
Housing units
540
Median home value
$123,900
Median gross rent
$610 / 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 86°F), coldest Jan (avg low 10°F).

JanFebMarAprMayJunJulAugSepOctNovDec
Avg high °F313546586876868574594434
Avg low °F101322334149555344332213
Precip in0.50.40.51.32.13.11.41.01.20.90.60.4

NOAA 1991–2020 climate normals from the nearest station: BIG SANDY (1.4 mi) · NOAA NCEI

Places in ZIP 59520

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