Every ZIP code in Caldwell County

646xx

The complete list of Caldwell County, MO ZIP codes with the city each one delivers to.
ZIP code	City
64624	Braymer
64625	Breckenridge
64637	Cowgill
64644	Hamilton
64649	Kidder
64650	Kingston
64671	Polo

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Cities and towns in Caldwell County

Area codes covering Caldwell County

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

Where Caldwell County's ZIP codes sit

Each point is the reference point of one Caldwell 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 Caldwell 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.