In which county is ZIP code 21001 located?

ZIP 21001 is listed under Harford, MD.

When was this page updated?

This page was updated on 2026-01-08.

ZIP Code 21001: Aberdeen, MD

ZIP: 21001

County: Harford

Coordinates: 39.51090, -76.18050

ZIP Type: Standard

Time Zone: Eastern Time (ET)

Explore detailed information for ZIP code 21001 in Aberdeen, MD. We include verified county details for Harford plus key geographic references used for mapping and logistics.

Primary City	Aberdeen
ZIP Code	21001
County	Harford
State	MD
Latitude / Longitude	39.51090, -76.18050
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 21001 (not an exact boundary).

Geographic & Administrative Context

Coordinates for 21001 are listed as 39.51090 / -76.18050, useful for GPS and service checks in and around Aberdeen, MD.

Local Coverage Notes

ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 21001 for mail delivery and general location reference in Harford, MD.

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

Related ZIP Codes (Nearby)

Explore other postal codes near Aberdeen within MD.

Frequently Asked Questions

What is the primary city for ZIP code 21001?

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

In which county is 21001 located?

ZIP code 21001 is situated within Harford, MD.

What are the coordinates for 21001?

The approximate center point is 39.51090 (Latitude) and -76.18050 (Longitude).

Is ZIP code 21001 active?

This page lists ZIP 21001 as Listed based on the latest refresh date shown above.

Does ZIP 21001 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