Loudoun County, Virginia

County seat: Leesburg · Population 449,749 (2025) · 516 sq mi

Loudoun County is the 4th most populous of Virginia's 133 counties, with 449,749 people (2025 estimate). Its county seat is Leesburg. It is part of the Northern Virginia Regional Commission (PD 8) region, one of the 21 Planning District Commissions of Virginia. The map shows its 8 cities and towns and the 8 neighboring counties.

Map of Loudoun County, Virginia with cities, towns and the county boundary
Loudoun County, Virginia with its cities and towns, unincorporated communities (CDPs) and neighboring counties. Boundaries: U.S. Census Bureau, 2025. Free to use with attribution (CC BY 4.0).
Download PDF (Letter) 188 KBPNG image 135 KBVirginia county map

Loudoun County facts

County seat
Leesburg
Population (2025 estimate)
449,749 +6.8% since 2020
Land area
516 sq mi 20th largest of 133
Water area
6 sq mi
Population density
872 per sq mi
Established
1757
Named after
John Campbell, 4th Earl of Loudoun British Army general
Largest city
Leesburg 49,917
Median household income
$181,765
Cities and towns
8 plus 23 CDPs
ZIP codes
21
Time zone
Eastern
FIPS code
51107

Cities and towns in Loudoun County

Loudoun County has 8 incorporated cities, towns and villages. Populations count the people living inside Loudoun County; cities that cross a county line also list the other counties.

NameTypePopulation 2025Also in
Leesburg (county seat)Town49,917
PurcellvilleTown8,890
LovettsvilleTown2,708
Round HillTown702
MiddleburgTown699
HamiltonTown608
HillsboroTown112
HerndonTown0Fairfax County

Unincorporated communities (CDPs)

Census-designated places are communities without their own city government; the county provides their services.

CommunityPopulationAlso in
Ashburn46,026
South Riding34,352
Sterling32,411
Brambleton24,537
Stone Ridge16,603
Broadlands14,353
Sugarland Run12,629
Cascades12,357
Lansdowne12,328
Lowes Island11,018
Loudoun Valley Estates10,271
Belmont9,729
Countryside9,661
Moorefield6,123
Dulles Town Center5,464
University Center3,923
Arcola3,509
One Loudoun3,309
Goose Creek Village2,461
Oak Grove2,408
Kincora1,008
Waterford220
Aldie163

ZIP codes in Loudoun County

21 ZIP codes reach into Loudoun County. ZIP codes ignore county lines, so some also cover a neighboring county.

Population of Loudoun County, 2020–2025

Loudoun County grew by 28,798 people (+6.8%) between April 2020 and July 2025: 15,146 more births than deaths and a net gain of 13,099 people from migration.

Year (July 1)Population
2020422,693
2021428,857
2022432,672
2023436,786
2024443,749
2025449,749

Neighboring counties

Printable Loudoun County map

The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.

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Sources

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