In which county is ZIP code 20104 located?

ZIP 20104 is listed under Loudoun, VA.

When was this page updated?

This page was updated on 2026-01-08.

ZIP Code 20104: Dulles, VA

ZIP: 20104

County: Loudoun

Coordinates: 39.08530, -77.64520

ZIP Type: Standard

Time Zone: Eastern Time (ET)

Explore detailed information for ZIP code 20104 in Dulles, VA. We include verified county details for Loudoun plus key geographic references used for mapping and logistics.

Primary City	Dulles
ZIP Code	20104
County	Loudoun
State	VA
Latitude / Longitude	39.08530, -77.64520
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 20104 (not an exact boundary).

Geographic & Administrative Context

Coordinates for 20104 are listed as 39.08530 / -77.64520, useful for GPS and service checks in and around Dulles, VA.

Local Coverage Notes

ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 20104 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 20104?

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

In which county is 20104 located?

ZIP code 20104 is situated within Loudoun, VA.

What are the coordinates for 20104?

The approximate center point is 39.08530 (Latitude) and -77.64520 (Longitude).

Is ZIP code 20104 active?

This page lists ZIP 20104 as Listed based on the latest refresh date shown above.

Does ZIP 20104 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