ZIP Code 57421: Amherst, SD
County: Marshall
Coordinates: 45.75850, -97.92740
ZIP Type: Standard
Time Zone: Central Time (CT)
This profile provides an in-depth look at ZIP code 57421, serving Amherst in SD. It lies in Marshall and supports delivery, planning, and address verification.
| Primary City | Amherst |
|---|
| ZIP Code | 57421 |
|---|
| County | Marshall |
|---|
| State | SD |
|---|
| Latitude / Longitude | 45.75850, -97.92740 |
|---|
| ZIP Type | Standard |
|---|
| Time Zone | Central Time (CT) |
|---|
| Data Updated | 2026-01-08 |
|---|
Advertisement
Maps & Useful Links
Open in Maps:
Google Maps ·
OpenStreetMap
These links show the approximate center point for ZIP 57421 (not an exact boundary).
Geographic & Administrative Context
For mapping and verification, 57421 is commonly represented around 45.75850, -97.92740. These coordinates help identify the general area within Marshall, SD.
Local Coverage Notes
ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 57421 for mail delivery and general location reference in
Marshall,
SD.
Some addresses near Amherst may share this ZIP due to delivery routing and local service areas.
Related ZIP Codes (Nearby)
Explore other postal codes near Amherst within SD.
Advertisement
Frequently Asked Questions
What is the primary city for ZIP code 57421?
The primary city for this ZIP code is Amherst, located in SD.
In which county is 57421 located?
ZIP code 57421 is situated within Marshall, SD.
What are the coordinates for 57421?
The approximate center point is 45.75850 (Latitude) and -97.92740 (Longitude).
Is ZIP code 57421 active?
This page lists ZIP 57421 as Listed based on the latest refresh date shown above.
Does ZIP 57421 cover multiple areas?
Yes. Many ZIP codes cover multiple neighborhoods or nearby areas. For exact boundaries, use official mapping tools.
Advertisement
Methodology & Data Notes
How we build this page: We generate this page from a structured ZIP dataset and refresh key fields (city, county, and coordinates) during scheduled updates. Coordinates represent an approximate center point, not an official boundary map.
Sources: Public ZIP reference datasets and geographic coordinate references. If you use specific sources (e.g., USPS, Census), list them on your About/Methodology page.
Page updated: 2026-01-08