In which county is ZIP code 20899 located?

ZIP 20899 is listed under Montgomery County, MD.

When was this page updated?

This page was updated on 2026-01-08.

ZIP Code 20899: Gaithersburg, MD

ZIP: 20899

County: Montgomery County

Coordinates: 39.14030, -77.22200

ZIP Type: Standard

Time Zone: Eastern Time (ET)

Get a reliable snapshot of the Gaithersburg, MD postal area 20899. This page summarizes county, coordinates, and local facts to help with services and location research.

Primary City	Gaithersburg
ZIP Code	20899
County	Montgomery County
State	MD
Latitude / Longitude	39.14030, -77.22200
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 20899 (not an exact boundary).

Geographic & Administrative Context

Coordinates for 20899 are listed as 39.14030 / -77.22200, useful for GPS and service checks in and around Gaithersburg, MD.

Local Coverage Notes

ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 20899 for mail delivery and general location reference in Montgomery County, MD.

Coverage may include nearby neighborhoods and adjacent unincorporated areas commonly associated with Gaithersburg.

Related ZIP Codes (Nearby)

Explore other postal codes near Gaithersburg within MD.

Frequently Asked Questions

What is the primary city for ZIP code 20899?

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

In which county is 20899 located?

ZIP code 20899 is situated within Montgomery County, MD.

What are the coordinates for 20899?

The approximate center point is 39.14030 (Latitude) and -77.22200 (Longitude).

Is ZIP code 20899 active?

This page lists ZIP 20899 as Listed based on the latest refresh date shown above.

Does ZIP 20899 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