Union County ZIP Codes

Union County is a county of New Mexico.

ZIP codes: 8
Cities & towns: 8
Area codes: 1
Land area: 3,825 sq mi

Every ZIP code in Union County

884xx

The complete list of Union County, NM ZIP codes with the city each one delivers to.
ZIP code	City
88410	Amistad
88414	Capulin
88415	Clayton
88418	Des Moines
88419	Folsom
88422	Gladstone
88424	Grenville
88436	Sedan

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Cities and towns in Union County

A further 4 places in Union 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 Union County

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

505 Area code 505

Where Union County's ZIP codes sit

Each point is the reference point of one Union 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 Union 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.