In which county is ZIP code 21791 located?

ZIP 21791 is listed under Carroll, MD.

When was this page updated?

This page was updated on 2026-01-08.

ZIP Code 21791: Union Bridge, MD

ZIP: 21791

County: Carroll

Coordinates: 39.57990, -77.13190

ZIP Type: Standard

Time Zone: Eastern Time (ET)

This profile provides an in-depth look at ZIP code 21791, serving Union Bridge in MD. It lies in Carroll and supports delivery, planning, and address verification.

Primary City	Union Bridge
ZIP Code	21791
County	Carroll
State	MD
Latitude / Longitude	39.57990, -77.13190
ZIP Type	Standard
Time Zone	Eastern Time (ET)
Data Updated	2026-01-08

Maps & Useful Links

Open in Maps: Google Maps · OpenStreetMap

These links show the approximate center point for ZIP 21791 (not an exact boundary).

Geographic & Administrative Context

Coordinates for 21791 are listed as 39.57990 / -77.13190, useful for GPS and service checks in and around Union Bridge, MD.

Local Coverage Notes

ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 21791 for mail delivery and general location reference in Carroll, MD.

Coverage may include nearby neighborhoods and adjacent unincorporated areas commonly associated with Union Bridge.

Related ZIP Codes (Nearby)

Explore other postal codes near Union Bridge within MD.

Frequently Asked Questions

What is the primary city for ZIP code 21791?

The primary city for this ZIP code is Union Bridge, located in MD.

In which county is 21791 located?

ZIP code 21791 is situated within Carroll, MD.

What are the coordinates for 21791?

The approximate center point is 39.57990 (Latitude) and -77.13190 (Longitude).

Is ZIP code 21791 active?

This page lists ZIP 21791 as Listed based on the latest refresh date shown above.

Does ZIP 21791 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