In which county is ZIP code 57751 located?

ZIP 57751 is listed under Pennington, SD.

When was this page updated?

This page was updated on 2026-01-08.

ZIP Code 57751: Keystone, SD

ZIP: 57751

County: Pennington

Coordinates: 43.88480, -103.39950

ZIP Type: Standard

Time Zone: Mountain Time (MT)

Get a reliable snapshot of the Keystone, SD postal area 57751. This page summarizes county, coordinates, and local facts to help with services and location research.

Primary City	Keystone
ZIP Code	57751
County	Pennington
State	SD
Latitude / Longitude	43.88480, -103.39950
ZIP Type	Standard
Time Zone	Mountain Time (MT)
Data Updated	2026-01-08

Maps & Useful Links

Open in Maps: Google Maps · OpenStreetMap

These links show the approximate center point for ZIP 57751 (not an exact boundary).

Geographic & Administrative Context

The geographic center of ZIP code 57751 is approximately 43.88480 (latitude) and -103.39950 (longitude). This location sits within Pennington, contributing to regional planning across SD.

Local Coverage Notes

ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 57751 for mail delivery and general location reference in Pennington, SD.

This ZIP may extend beyond the city core into nearby communities within Pennington.

Related ZIP Codes (Nearby)

Explore other postal codes near Keystone within SD.

Frequently Asked Questions

What is the primary city for ZIP code 57751?

The primary city for this ZIP code is Keystone, located in SD.

In which county is 57751 located?

ZIP code 57751 is situated within Pennington, SD.

What are the coordinates for 57751?

The approximate center point is 43.88480 (Latitude) and -103.39950 (Longitude).

Is ZIP code 57751 active?

This page lists ZIP 57751 as Listed based on the latest refresh date shown above.

Does ZIP 57751 cover multiple areas?

Yes. Many ZIP codes cover multiple neighborhoods or nearby areas. For exact boundaries, use official mapping tools.

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