City · South Dakota · United States
Amherst, SD — ZIP codes
1 ZIP code · Marshall County
- City
- Amherst
- County
- Marshall
- State
- South Dakota
- Country
- United States
- Postal code
- 57421Single source
- Coordinates
- 45.7585, -97.9274 View on OpenStreetMap
- Area code
- 605 (from the nearest rate centre)
ZIP codes (1)
| Postal code | Place name | Verification |
|---|---|---|
| 57421 | Amherst | Single source |
Sources and verification
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · U.S. Census Bureau (ACS) · U.S. Census Bureau · NOAA NCEI · usda-phzm. Last generated : 2026-08-21. Report an error.