Fergus County ZIP Codes

Fergus County is a county of Montana.

ZIP codes: 10
Cities & towns: 10
Area codes: 1
Land area: 4,339 sq mi

Every ZIP code in Fergus County

590xx–594xx

The complete list of Fergus County, MT ZIP codes with the city each one delivers to.
ZIP code	City
59032	Grass Range
59418	Buffalo
59424	Coffee Creek
59430	Denton
59441	Forest Grove
59451	Hilger
59457	Lewistown
59464	Moore
59471	Roy
59489	Winifred

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Cities and towns in Fergus County

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

Each point is the reference point of one Fergus 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 Fergus 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.