Amherst ZIP code, South Dakota
The ZIP code for Amherst, SD is 57421, and its area code is 605.
- USPS city name
- 1 ZIP code
- Population
- 75
- Area code
- 605
- County
- Marshall County
- State
- South Dakota
NANPA lists no telephone rate centre for Amherst itself, so these are the area codes of the nearest one, Claremont (7.8 miles). A town on an area-code boundary can differ from its neighbour.
ZIP codes addressed as Amherst
| ZIP | City | Type | Population | Median income | Median home |
|---|---|---|---|---|---|
57421 | Amherst , SD | Standard | 75 | — | — |
Map of Amherst ZIP codes
The ZIP codes of Amherst, SD, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.
Towns near Amherst
The nearest larger towns are Claremont (106 people, 7.8 mi), Britton (988 people, 7.9 mi) and Langford (481 people, 11 mi).
More nearby: every ZIP code in Marshall County · South Dakota ZIP codes
Cite this page
zipcodes.pro. “Amherst, SD ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/sd/amherst
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