Allendale County ZIP Codes

Allendale County is a county of South Carolina.

ZIP codes: 5
Cities & towns: 5
Area codes: 2
Land area: 408 sq mi

Every ZIP code in Allendale County

298xx

The complete list of Allendale County, SC ZIP codes with the city each one delivers to.
ZIP code	City
29810	Allendale
29827	Fairfax
29836	Martin
29846	Sycamore
29849	Ulmer

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Cities and towns in Allendale County

A further 1 place in Allendale 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 Allendale County

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

Where Allendale County's ZIP codes sit

Each point is the reference point of one Allendale 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 Allendale 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.