Gregory County ZIP Codes
Gregory County is a county of South Dakota.
- ZIP codes
- 7
- Cities & towns
- 7
- Area codes
- 1
- Land area
- 1,015 sq mi
Every ZIP code in Gregory County
| ZIP code | City |
|---|---|
| 57317 | Bonesteel |
| 57335 | Fairfax |
| 57523 | Burke |
| 57529 | Dallas |
| 57533 | Gregory |
| 57538 | Herrick |
| 57571 | Saint Charles |
We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Gregory County codes above are listed without a column we would have to invent.
Cities and towns in Gregory County
A further 1 place in Gregory 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 Gregory County
Telephone and postal boundaries are drawn by different bodies, so these codes overlap the county without matching its edges.
Where Gregory County's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Scope every ZIP code recorded in Gregory 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 . The outline is a convex envelope of ZIP reference points, not a jurisdiction boundary.