In which county is ZIP code 21821 located?

ZIP 21821 is listed under Somerset, MD.

When was this page updated?

This page was updated on 2026-01-08.

ZIP Code 21821: Deal Island, MD

ZIP: 21821

County: Somerset

Coordinates: 38.15330, -75.94960

ZIP Type: Standard

Time Zone: Eastern Time (ET)

This profile provides an in-depth look at ZIP code 21821, serving Deal Island in MD. It lies in Somerset and supports delivery, planning, and address verification.

Primary City	Deal Island
ZIP Code	21821
County	Somerset
State	MD
Latitude / Longitude	38.15330, -75.94960
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 21821 (not an exact boundary).

Geographic & Administrative Context

The geographic center of ZIP code 21821 is approximately 38.15330 (latitude) and -75.94960 (longitude). This location sits within Somerset, contributing to regional planning across MD.

Local Coverage Notes

ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 21821 for mail delivery and general location reference in Somerset, MD.

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

Related ZIP Codes (Nearby)

Explore other postal codes near Deal Island within MD.

Frequently Asked Questions

What is the primary city for ZIP code 21821?

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

In which county is 21821 located?

ZIP code 21821 is situated within Somerset, MD.

What are the coordinates for 21821?

The approximate center point is 38.15330 (Latitude) and -75.94960 (Longitude).

Is ZIP code 21821 active?

This page lists ZIP 21821 as Listed based on the latest refresh date shown above.

Does ZIP 21821 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