In which county is ZIP code 21150 located?

ZIP 21150 is listed under Howard, MD.

When was this page updated?

This page was updated on 2026-01-08.

ZIP Code 21150: Simpsonville, MD

ZIP: 21150

County: Howard

Coordinates: 39.23640, -76.94190

ZIP Type: Standard

Time Zone: Eastern Time (ET)

Explore detailed information for ZIP code 21150 in Simpsonville, MD. We include verified county details for Howard plus key geographic references used for mapping and logistics.

Primary City	Simpsonville
ZIP Code	21150
County	Howard
State	MD
Latitude / Longitude	39.23640, -76.94190
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 21150 (not an exact boundary).

Geographic & Administrative Context

Coordinates for 21150 are listed as 39.23640 / -76.94190, useful for GPS and service checks in and around Simpsonville, MD.

Local Coverage Notes

ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 21150 for mail delivery and general location reference in Howard, MD.

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

Related ZIP Codes (Nearby)

Explore other postal codes near Simpsonville within MD.

Frequently Asked Questions

What is the primary city for ZIP code 21150?

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

In which county is 21150 located?

ZIP code 21150 is situated within Howard, MD.

What are the coordinates for 21150?

The approximate center point is 39.23640 (Latitude) and -76.94190 (Longitude).

Is ZIP code 21150 active?

This page lists ZIP 21150 as Listed based on the latest refresh date shown above.

Does ZIP 21150 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