In which county is ZIP code 21042 located?

ZIP 21042 is listed under Howard, MD.

When was this page updated?

This page was updated on 2026-01-08.

ZIP Code 21042: Ellicott City, MD

ZIP: 21042

County: Howard

Coordinates: 39.27260, -76.86140

ZIP Type: Standard

Time Zone: Eastern Time (ET)

Get a reliable snapshot of the Ellicott City, MD postal area 21042. This page summarizes county, coordinates, and local facts to help with services and location research.

Primary City	Ellicott City
ZIP Code	21042
County	Howard
State	MD
Latitude / Longitude	39.27260, -76.86140
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 21042 (not an exact boundary).

Geographic & Administrative Context

For mapping and verification, 21042 is commonly represented around 39.27260, -76.86140. These coordinates help identify the general area within Howard, MD.

Local Coverage Notes

ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 21042 for mail delivery and general location reference in Howard, MD.

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

Related ZIP Codes (Nearby)

Explore other postal codes near Ellicott City within MD.

Frequently Asked Questions

What is the primary city for ZIP code 21042?

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

In which county is 21042 located?

ZIP code 21042 is situated within Howard, MD.

What are the coordinates for 21042?

The approximate center point is 39.27260 (Latitude) and -76.86140 (Longitude).

Is ZIP code 21042 active?

This page lists ZIP 21042 as Listed based on the latest refresh date shown above.

Does ZIP 21042 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