Madison County ZIP Codes

Madison County is a county of Montana.

ZIP codes: 11
Cities & towns: 11
Area codes: 1
Land area: 3,588 sq mi

Every ZIP code in Madison County

597xx

The complete list of Madison County, MT ZIP codes with the city each one delivers to.
ZIP code	City
59710	Alder
59720	Cameron
59729	Ennis
59735	Harrison
59740	Mc Allister
59745	Norris
59747	Pony
59749	Sheridan
59751	Silver Star
59754	Twin Bridges
59755	Virginia City

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Cities and towns in Madison County

A further 7 places in Madison 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 Madison 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 Madison County's ZIP codes sit

Each point is the reference point of one Madison 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 Madison 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.