ZIP Code 57421
Amherst · Marshall, South Dakota
57421 is the ZIP code of Amherst in Marshall, South Dakota, United States.
- ZIP Code
- 57421
- County
- Marshall
- State
- South Dakota
- Country
- United States
Place with ZIP code 57421
| Place | County | Location |
|---|---|---|
| Amherst | Marshall | 45.758, -97.927 |
Nearby ZIP codes
Frequently asked questions
Which places use ZIP code 57421?
Amherst.
Which county and state is 57421 in?
Marshall, South Dakota, United States.
Source: GeoNames postal codes (CC BY 4.0), geonames.org, retrieved 2026-10-22. Place coordinates are approximate. Check with the national postal service before sending anything valuable.