Harmon County ZIP Codes

Harmon County is a county of Oklahoma.

ZIP codes: 3
Cities & towns: 3
Area codes: 1
Land area: 537 sq mi

Every ZIP code in Harmon County

735xx

The complete list of Harmon County, OK ZIP codes with the city each one delivers to.
ZIP code	City
73544	Gould
73550	Hollis
73571	Vinson

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Cities and towns in Harmon County

A further 1 place in Harmon County appears in the postal source without a page of its own; its codes are in the table above and each one links to its own page.

Area codes covering Harmon County

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

580 Area code 580

Where Harmon County's ZIP codes sit

Each point is the reference point of one Harmon 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 Harmon 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.