ZIP Code 20104

20104 is one of Virginia's ZIP codes, delivering to addresses in Dulles, Loudoun County.

City: Dulles
County: Loudoun County
State: Virginia
Prefix: 201xx

Where this code sits

20104 is part of the 201xx range, the group of codes handled by one mail processing centre. Dulles is served by 5 ZIP codes in total.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 20104 delivers to without sharing its boundary.

ZIP codes nearest 20104

The ZIP codes whose reference points sit closest to 20104.
ZIP code	Distance	Delivers to
ZIP code 20102	0.0 mi	Dulles, VA
ZIP code 20146	0.0 mi	Ashburn, VA
ZIP code 20160	2.5 mi	Lincoln, VA
ZIP code 20159	3.5 mi	Hamilton, VA
ZIP code 20175	3.7 mi	Leesburg, VA
ZIP code 20158	3.7 mi	Hamilton, VA
ZIP code 20177	4.9 mi	Leesburg, VA
ZIP code 20178	4.9 mi	Leesburg, VA

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.

Each point is the reference point for 20104, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope ZIP code 20104. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.