In which county is ZIP code 21757 located?

ZIP 21757 is listed under Carroll, MD.

When was this page updated?

This page was updated on 2026-01-08.

ZIP Code 21757: Keymar, MD

ZIP: 21757

County: Carroll

Coordinates: 39.56560, -77.28170

ZIP Type: Standard

Time Zone: Eastern Time (ET)

This profile provides an in-depth look at ZIP code 21757, serving Keymar in MD. It lies in Carroll and supports delivery, planning, and address verification.

Primary City	Keymar
ZIP Code	21757
County	Carroll
State	MD
Latitude / Longitude	39.56560, -77.28170
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 21757 (not an exact boundary).

Geographic & Administrative Context

For mapping and verification, 21757 is commonly represented around 39.56560, -77.28170. These coordinates help identify the general area within Carroll, MD.

Local Coverage Notes

ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 21757 for mail delivery and general location reference in Carroll, MD.

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

Related ZIP Codes (Nearby)

Explore other postal codes near Keymar within MD.

Frequently Asked Questions

What is the primary city for ZIP code 21757?

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

In which county is 21757 located?

ZIP code 21757 is situated within Carroll, MD.

What are the coordinates for 21757?

The approximate center point is 39.56560 (Latitude) and -77.28170 (Longitude).

Is ZIP code 21757 active?

This page lists ZIP 21757 as Listed based on the latest refresh date shown above.

Does ZIP 21757 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