In which county is ZIP code 21128 located?

ZIP 21128 is listed under Baltimore County, MD.

When was this page updated?

This page was updated on 2026-01-08.

ZIP Code 21128: Perry Hall, MD

ZIP: 21128

County: Baltimore County

Coordinates: 39.40100, -76.45100

ZIP Type: Standard

Time Zone: Eastern Time (ET)

This profile provides an in-depth look at ZIP code 21128, serving Perry Hall in MD. It lies in Baltimore County and supports delivery, planning, and address verification.

Primary City	Perry Hall
ZIP Code	21128
County	Baltimore County
State	MD
Latitude / Longitude	39.40100, -76.45100
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 21128 (not an exact boundary).

Geographic & Administrative Context

Coordinates for 21128 are listed as 39.40100 / -76.45100, useful for GPS and service checks in and around Perry Hall, MD.

Local Coverage Notes

ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 21128 for mail delivery and general location reference in Baltimore County, MD.

Some addresses near Perry Hall may share this ZIP due to delivery routing and local service areas.

Related ZIP Codes (Nearby)

Explore other postal codes near Perry Hall within MD.

Frequently Asked Questions

What is the primary city for ZIP code 21128?

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

In which county is 21128 located?

ZIP code 21128 is situated within Baltimore County, MD.

What are the coordinates for 21128?

The approximate center point is 39.40100 (Latitude) and -76.45100 (Longitude).

Is ZIP code 21128 active?

This page lists ZIP 21128 as Listed based on the latest refresh date shown above.

Does ZIP 21128 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