In which county is ZIP code 21738 located?

ZIP 21738 is listed under Howard, MD.

When was this page updated?

This page was updated on 2026-01-08.

ZIP Code 21738: Glenwood, MD

ZIP: 21738

County: Howard

Coordinates: 39.27950, -77.01480

ZIP Type: Standard

Time Zone: Eastern Time (ET)

This profile provides an in-depth look at ZIP code 21738, serving Glenwood in MD. It lies in Howard and supports delivery, planning, and address verification.

Primary City	Glenwood
ZIP Code	21738
County	Howard
State	MD
Latitude / Longitude	39.27950, -77.01480
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 21738 (not an exact boundary).

Geographic & Administrative Context

The geographic center of ZIP code 21738 is approximately 39.27950 (latitude) and -77.01480 (longitude). This location sits within Howard, contributing to regional planning across MD.

Local Coverage Notes

ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 21738 for mail delivery and general location reference in Howard, MD.

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

Related ZIP Codes (Nearby)

Explore other postal codes near Glenwood within MD.

Frequently Asked Questions

What is the primary city for ZIP code 21738?

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

In which county is 21738 located?

ZIP code 21738 is situated within Howard, MD.

What are the coordinates for 21738?

The approximate center point is 39.27950 (Latitude) and -77.01480 (Longitude).

Is ZIP code 21738 active?

This page lists ZIP 21738 as Listed based on the latest refresh date shown above.

Does ZIP 21738 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