In which county is ZIP code 21781 located?

ZIP 21781 is listed under Washington, MD.

When was this page updated?

This page was updated on 2026-01-08.

ZIP Code 21781: Saint James, MD

ZIP: 21781

County: Washington

Coordinates: 39.56990, -77.76070

ZIP Type: Standard

Time Zone: Eastern Time (ET)

Explore detailed information for ZIP code 21781 in Saint James, MD. We include verified county details for Washington plus key geographic references used for mapping and logistics.

Primary City	Saint James
ZIP Code	21781
County	Washington
State	MD
Latitude / Longitude	39.56990, -77.76070
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 21781 (not an exact boundary).

Geographic & Administrative Context

The geographic center of ZIP code 21781 is approximately 39.56990 (latitude) and -77.76070 (longitude). This location sits within Washington, contributing to regional planning across MD.

Local Coverage Notes

ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 21781 for mail delivery and general location reference in Washington, MD.

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

Related ZIP Codes (Nearby)

Explore other postal codes near Saint James within MD.

Frequently Asked Questions

What is the primary city for ZIP code 21781?

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

In which county is 21781 located?

ZIP code 21781 is situated within Washington, MD.

What are the coordinates for 21781?

The approximate center point is 39.56990 (Latitude) and -77.76070 (Longitude).

Is ZIP code 21781 active?

This page lists ZIP 21781 as Listed based on the latest refresh date shown above.

Does ZIP 21781 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