ZIP Code 20166

20166 is one of Virginia's ZIP codes, delivering to addresses in Sterling, Loudoun County.

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

Where this code sits

20166 is part of the 201xx range, the group of codes handled by one mail processing centre. Sterling 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 20166 delivers to without sharing its boundary.

ZIP codes nearest 20166

The ZIP codes whose reference points sit closest to 20166.
ZIP code	Distance	Delivers to
ZIP code 20598	1.5 mi	Dhs, VA
ZIP code 20103	1.6 mi	Dulles, VA
ZIP code 20101	2.2 mi	Dulles, VA
ZIP code 20189	2.5 mi	Dulles, VA
ZIP code 20163	2.9 mi	Sterling, VA
ZIP code 20167	2.9 mi	Sterling, VA
ZIP code 20148	3.8 mi	Ashburn, VA
ZIP code 20147	3.9 mi	Ashburn, 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 20166, plotted from its record coordinates.

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

Scope ZIP code 20166. 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.