Los Alamos County ZIP Codes

Los Alamos County is a county of New Mexico.

ZIP codes: 3
Cities & towns: 2
Area codes: 1
Land area: 109 sq mi

Every ZIP code in Los Alamos County

875xx

The complete list of Los Alamos County, NM ZIP codes with the city each one delivers to.
ZIP code	City
87544	Los Alamos
87545	Los Alamos
87547	White Rock

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Area codes covering Los Alamos 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 Los Alamos County's ZIP codes sit

Each point is the reference point of one Los Alamos 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 Los Alamos 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.