In which county is ZIP code 21111 located?

ZIP 21111 is listed under Baltimore County, MD.

When was this page updated?

This page was updated on 2026-01-08.

ZIP Code 21111: Monkton, MD

ZIP: 21111

County: Baltimore County

Coordinates: 39.56620, -76.59790

ZIP Type: Standard

Time Zone: Eastern Time (ET)

This profile provides an in-depth look at ZIP code 21111, serving Monkton in MD. It lies in Baltimore County and supports delivery, planning, and address verification.

Primary City	Monkton
ZIP Code	21111
County	Baltimore County
State	MD
Latitude / Longitude	39.56620, -76.59790
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 21111 (not an exact boundary).

Geographic & Administrative Context

For mapping and verification, 21111 is commonly represented around 39.56620, -76.59790. These coordinates help identify the general area within Baltimore County, MD.

Local Coverage Notes

ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 21111 for mail delivery and general location reference in Baltimore County, MD.

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

Related ZIP Codes (Nearby)

Explore other postal codes near Monkton within MD.

Frequently Asked Questions

What is the primary city for ZIP code 21111?

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

In which county is 21111 located?

ZIP code 21111 is situated within Baltimore County, MD.

What are the coordinates for 21111?

The approximate center point is 39.56620 (Latitude) and -76.59790 (Longitude).

Is ZIP code 21111 active?

This page lists ZIP 21111 as Listed based on the latest refresh date shown above.

Does ZIP 21111 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