ZIP codes

ZIP codes in Loudoun County, Virginia

Loudoun County has 20 ZIP codes. 15 lie entirely inside it and 5 are shared with neighboring counties, so part of their land and their people are elsewhere. About 435,148 people live in the parts inside it (ACS 2020–2024).

By the All Map Tools Team

ZIP codes: 20; 1 more just touches the border (under 1% of their land)
Entirely inside: 15; 99% or more of their land
Shared with other counties: 5; Most with Fauquier County (3)
Most populated ZIP: 20147; 67,692 people · Ashburn
Least populated ZIP: 20129; 538 people
Largest ZIP by land: 20132; 85 sq mi · Purcellville

Map of the ZIP codes in Loudoun County

Entirely in the county (99% or more of its land)
Shared, mostly in this county
Shared, mostly in other counties
Neighboring counties

Open in the interactive tool

Each area is a ZIP code with its number where it fits. Hover over one to see its name.

All ZIP codes in Loudoun County

20 ZIP codes in Loudoun County, VA, by number
ZIP code	Main city	Population	Land in the county	Residents in the county
20105	Stone Ridge	37,639	100%	37,639
20117	Middleburg	2,790	89%	≈ 2,657
20120	Bull Run	42,896	10%	≈ 1,764
20129	—	538	100%	538
20130	Paris	271	23%	≈ 83
20132	Purcellville	19,817	100%	19,817
20135	Shenandoah Retreat	3,585	39%	≈ 1,534
20141	Round Hill	8,359	100%	8,359
20147	Ashburn	67,692	100%	67,692
20148	Brambleton	64,021	100%	64,021
20152	South Riding	36,674	100%	36,674
20158	Hamilton	4,979	100%	4,979
20164	Sterling	43,436	100%	43,436
20165	Cascades	34,088	100%	34,088
20166	Dulles Town Center	14,949	100%	14,949
20175	Leesburg	34,733	100%	34,733
20176	Leesburg	51,471	100%	51,471
20180	Lovettsville	7,531	100%	7,531
20184	Upperville	635	56%	≈ 345
20197	Waterford	1,825	100%	1,825

They also touch the county with under 1% of their land, so they aren’t counted: 22066.

ZIP codes shared with other counties

These 5 ZIP codes have part of their land in another county. The first figure is the share of their land in Loudoun County; then, where the rest lies.

20117 (Middleburg): 89% here; 11% in Fauquier County.
20120 (Bull Run): 10% here; 90% in Fairfax County.
20130 (Paris): 23% here; 54% in Clarke County and 23% in Fauquier County.
20135 (Shenandoah Retreat): 39% here; 61% in Clarke County.
20184 (Upperville): 56% here; 44% in Fauquier County.

Cities and prefixes

By main city (the city, town or CDP each ZIP shares the most land with), the ones with the most are Leesburg (2), Ashburn (1), Brambleton (1), Bull Run (1), Cascades (1), and Dulles Town Center (1); 18 places in all.

All 20 start with the same three digits, 201: the prefix of the USPS sorting center that handles them.

Neighboring counties

Each one with its ZIP codes. Those without a page of their own open in the tool.

Tools for this county

ZIP codes by county or city The same ZIP codes on an interactive map, with the list as CSV or to copy County map with cities Its cities, towns and CDPs with their population ZIP codes in a radius The ZIP codes within 10 miles of its center, or any distance you like

Sources

U.S. Census Bureau, 2020 ZCTA to County, ZCTA to Place and ZCTA to Census Tract Relationship Files (and the 2022 County Subdivision to ZCTA file for Connecticut). Public domain.
U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, table B01003 (population of each ZIP code, census tract and Connecticut town). Public domain.
U.S. Census Bureau, Vintage 2025 Population Estimates (county population) and 2025 Gazetteer Files (land area and interior point of each ZIP code). Public domain.
U.S. Census Bureau, Cartographic Boundary Files: ZCTAs 2020 and counties 2025, 1:500,000; county adjacency file 2025. Public domain.

How we count. ZIP codes here are the Census Bureau’s ZIP Code Tabulation Areas (ZCTAs), the areas it draws to match USPS ZIP codes; ZIPs with no area of their own (PO boxes, single buildings) aren’t included. A ZIP can cross county lines: “Land in the county” is the exact share of its land inside, from the Census relationship files. “Residents in the county” is the whole ZIP for those entirely inside; for shared ones it’s an estimate, spreading the people of each census tract over the land it shares with the ZIP. Population: ACS 2020–2024. Methodology.

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