In which county is ZIP code 21045 located?

ZIP 21045 is listed under Howard, MD.

When was this page updated?

This page was updated on 2026-01-08.

ZIP Code 21045: Columbia, MD

ZIP: 21045

County: Howard

Coordinates: 39.20510, -76.83220

ZIP Type: Standard

Time Zone: Eastern Time (ET)

This profile provides an in-depth look at ZIP code 21045, serving Columbia in MD. It lies in Howard and supports delivery, planning, and address verification.

Primary City	Columbia
ZIP Code	21045
County	Howard
State	MD
Latitude / Longitude	39.20510, -76.83220
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 21045 (not an exact boundary).

Geographic & Administrative Context

For mapping and verification, 21045 is commonly represented around 39.20510, -76.83220. These coordinates help identify the general area within Howard, MD.

Local Coverage Notes

ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 21045 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 Columbia within MD.

Frequently Asked Questions

What is the primary city for ZIP code 21045?

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

In which county is 21045 located?

ZIP code 21045 is situated within Howard, MD.

What are the coordinates for 21045?

The approximate center point is 39.20510 (Latitude) and -76.83220 (Longitude).

Is ZIP code 21045 active?

This page lists ZIP 21045 as Listed based on the latest refresh date shown above.

Does ZIP 21045 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