Hamilton County ZIP Codes

Hamilton County is a county of Kansas.

ZIP codes: 3
Cities & towns: 3
Area codes: 1
Land area: 997 sq mi

Every ZIP code in Hamilton County

678xx

The complete list of Hamilton County, KS ZIP codes with the city each one delivers to.
ZIP code	City
67836	Coolidge
67857	Kendall
67878	Syracuse

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Cities and towns in Hamilton County

A further 1 place in Hamilton 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 Hamilton County

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

620 Area code 620

Where Hamilton County's ZIP codes sit

Each point is the reference point of one Hamilton 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 Hamilton 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.