Fall River County ZIP Codes

Fall River County is a county of South Dakota.

ZIP codes: 5
Cities & towns: 5
Area codes: 1
Land area: 1,740 sq mi

Every ZIP code in Fall River County

577xx

The complete list of Fall River County, SD ZIP codes with the city each one delivers to.
ZIP code	City
57735	Edgemont
57747	Hot Springs
57763	Oelrichs
57766	Oral
57782	Smithwick

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Cities and towns in Fall River County

A further 2 places in Fall River County appear in the postal source without a page of its own; their codes are in the table above and each one links to its own page.

Area codes covering Fall River County

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

605 Area code 605

Where Fall River County's ZIP codes sit

Each point is the reference point of one Fall River 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 Fall River 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.