In which county is ZIP code 57630 located?

ZIP 57630 is listed under Dewey, SD.

When was this page updated?

This page was updated on 2026-01-08.

ZIP Code 57630: Glencross, SD

ZIP: 57630

County: Dewey

Coordinates: 45.44830, -100.92130

ZIP Type: Standard

Time Zone: Mountain Time (MT)

Explore detailed information for ZIP code 57630 in Glencross, SD. We include verified county details for Dewey plus key geographic references used for mapping and logistics.

Primary City	Glencross
ZIP Code	57630
County	Dewey
State	SD
Latitude / Longitude	45.44830, -100.92130
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 57630 (not an exact boundary).

Geographic & Administrative Context

The geographic center of ZIP code 57630 is approximately 45.44830 (latitude) and -100.92130 (longitude). This location sits within Dewey, contributing to regional planning across SD.

Local Coverage Notes

ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 57630 for mail delivery and general location reference in Dewey, SD.

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

Related ZIP Codes (Nearby)

Explore other postal codes near Glencross within SD.

Frequently Asked Questions

What is the primary city for ZIP code 57630?

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

In which county is 57630 located?

ZIP code 57630 is situated within Dewey, SD.

What are the coordinates for 57630?

The approximate center point is 45.44830 (Latitude) and -100.92130 (Longitude).

Is ZIP code 57630 active?

This page lists ZIP 57630 as Listed based on the latest refresh date shown above.

Does ZIP 57630 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