In which county is ZIP code 20830 located?

ZIP 20830 is listed under Montgomery County, MD.

When was this page updated?

This page was updated on 2026-01-08.

ZIP Code 20830: Olney, MD

ZIP: 20830

County: Montgomery County

Coordinates: 39.15520, -77.06670

ZIP Type: Standard

Time Zone: Eastern Time (ET)

Get a reliable snapshot of the Olney, MD postal area 20830. This page summarizes county, coordinates, and local facts to help with services and location research.

Primary City	Olney
ZIP Code	20830
County	Montgomery County
State	MD
Latitude / Longitude	39.15520, -77.06670
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 20830 (not an exact boundary).

Geographic & Administrative Context

Coordinates for 20830 are listed as 39.15520 / -77.06670, useful for GPS and service checks in and around Olney, MD.

Local Coverage Notes

ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 20830 for mail delivery and general location reference in Montgomery County, MD.

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

Related ZIP Codes (Nearby)

Explore other postal codes near Olney within MD.

Frequently Asked Questions

What is the primary city for ZIP code 20830?

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

In which county is 20830 located?

ZIP code 20830 is situated within Montgomery County, MD.

What are the coordinates for 20830?

The approximate center point is 39.15520 (Latitude) and -77.06670 (Longitude).

Is ZIP code 20830 active?

This page lists ZIP 20830 as Listed based on the latest refresh date shown above.

Does ZIP 20830 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