Sheridan County ZIP Codes

Sheridan County is a county of Montana.

ZIP codes: 9
Cities & towns: 9
Area codes: 1
Land area: 1,677 sq mi

Every ZIP code in Sheridan County

592xx

The complete list of Sheridan County, MT ZIP codes with the city each one delivers to.
ZIP code	City
59211	Antelope
59219	Dagmar
59247	Medicine Lake
59252	Outlook
59254	Plentywood
59256	Raymond
59257	Redstone
59258	Reserve
59275	Westby

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Sheridan County codes above are listed without a column we would have to invent.

Cities and towns in Sheridan County

A further 5 places in Sheridan 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 Sheridan 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 Sheridan County's ZIP codes sit

Each point is the reference point of one Sheridan 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 Sheridan 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.