In which county is ZIP code 20101 located?

ZIP 20101 is listed under Loudoun, VA.

When was this page updated?

This page was updated on 2026-01-08.

ZIP Code 20101: Dulles, VA

ZIP: 20101

County: Loudoun

Coordinates: 39.00210, -77.44210

ZIP Type: Standard

Time Zone: Eastern Time (ET)

Get a reliable snapshot of the Dulles, VA postal area 20101. This page summarizes county, coordinates, and local facts to help with services and location research.

Primary City	Dulles
ZIP Code	20101
County	Loudoun
State	VA
Latitude / Longitude	39.00210, -77.44210
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 20101 (not an exact boundary).

Geographic & Administrative Context

For mapping and verification, 20101 is commonly represented around 39.00210, -77.44210. These coordinates help identify the general area within Loudoun, VA.

Local Coverage Notes

ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 20101 for mail delivery and general location reference in Loudoun, VA.

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

Related ZIP Codes (Nearby)

Explore other postal codes near Dulles within VA.

Frequently Asked Questions

What is the primary city for ZIP code 20101?

The primary city for this ZIP code is Dulles, located in VA.

In which county is 20101 located?

ZIP code 20101 is situated within Loudoun, VA.

What are the coordinates for 20101?

The approximate center point is 39.00210 (Latitude) and -77.44210 (Longitude).

Is ZIP code 20101 active?

This page lists ZIP 20101 as Listed based on the latest refresh date shown above.

Does ZIP 20101 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