Big Horn County ZIP Codes

Big Horn County is a county of Montana.

ZIP codes: 10
Cities & towns: 10
Area codes: 1
Land area: 4,998 sq mi

Every ZIP code in Big Horn County

590xx

The complete list of Big Horn County, MT ZIP codes with the city each one delivers to.
ZIP code	City
59016	Busby
59022	Crow Agency
59025	Decker
59031	Garryowen
59034	Hardin
59035	Fort Smith
59050	Lodge Grass
59066	Pryor
59075	Saint Xavier
59089	Wyola

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Big Horn County codes above are listed without a column we would have to invent.

Cities and towns in Big Horn County

A further 8 places in Big Horn County appear in the postal source without a page of its own; their codes are in the table above and each one links to its own page.

Area codes covering Big Horn County

Telephone and postal boundaries are drawn by different bodies, so these codes overlap the county without matching its edges.

406 Area code 406

Where Big Horn County's ZIP codes sit

Each point is the reference point of one Big Horn County ZIP code, plotted from its record coordinates. The outline is the convex envelope of those points — a footprint, not a boundary.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope every ZIP code recorded in Big Horn County. Source GeoNames US postal codes (2026-07 postal dump), Census 2024 county Gazetteer (2024 Gazetteer) and geoinfo-dataset (full_dataset) ZIP→NPA (2018 snapshot). Updated 16 July 2026. The outline is a convex envelope of ZIP reference points, not a jurisdiction boundary.