In which county is ZIP code 21010 located?

ZIP 21010 is listed under Harford, MD.

When was this page updated?

This page was updated on 2026-01-08.

ZIP Code 21010: Gunpowder, MD

ZIP: 21010

County: Harford

Coordinates: 39.39820, -76.27430

ZIP Type: Standard

Time Zone: Eastern Time (ET)

Get a reliable snapshot of the Gunpowder, MD postal area 21010. This page summarizes county, coordinates, and local facts to help with services and location research.

Primary City	Gunpowder
ZIP Code	21010
County	Harford
State	MD
Latitude / Longitude	39.39820, -76.27430
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 21010 (not an exact boundary).

Geographic & Administrative Context

The geographic center of ZIP code 21010 is approximately 39.39820 (latitude) and -76.27430 (longitude). This location sits within Harford, contributing to regional planning across MD.

Local Coverage Notes

ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 21010 for mail delivery and general location reference in Harford, MD.

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

Related ZIP Codes (Nearby)

Explore other postal codes near Gunpowder within MD.

Frequently Asked Questions

What is the primary city for ZIP code 21010?

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

In which county is 21010 located?

ZIP code 21010 is situated within Harford, MD.

What are the coordinates for 21010?

The approximate center point is 39.39820 (Latitude) and -76.27430 (Longitude).

Is ZIP code 21010 active?

This page lists ZIP 21010 as Listed based on the latest refresh date shown above.

Does ZIP 21010 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