By Patricia Jones Loudoun County is a prosperous county in Northern Virginia between Washington, D.C., and the Blue Ridge Mountains. Eastern communities form part of the capital region’s technology corridor, while western Loudoun retains farms, historic villages, vineyards, equestrian properties and protected rural landscapes.
Leesburg is the county seat and the center of government and court operations. Ashburn, Sterling, Brambleton and South Riding are major communities. Washington Dulles International Airport, the Silver Line Metrorail and regional highways connect Loudoun with the wider metropolitan area.
Quick Overview of Loudoun County
| Category | Details |
| State | Virginia |
| Region | Northern Virginia; Washington metropolitan area |
| County seat | Leesburg |
| Founded | 1757 |
| Estimated population | 449,749 in 2025 |
| Land area | Approximately 516 square miles |
| Incorporated towns | Seven |
| Governing body | Nine-member Board of Supervisors |
| Board chair | Phyllis J. Randall |
| Board vice chair | Michael R. Turner |
| County administrator | Tim Hemstreet |
| Circuit Court chief judge | Judge Douglas L. Fleming Jr. |
| Sheriff | Mike Chapman |
| Commonwealth’s attorney | Bob Anderson |
| Clerk of Circuit Court | Gary M. Clemens |
| Major sectors | Technology, data centers, aviation, government contracting, healthcare, construction and tourism |
Location and Geographic Structure
Loudoun County covers about 516 square miles. The Potomac River forms much of its northern boundary, while the Blue Ridge Mountains shape the west. Fairfax County lies east, Prince William County southeast and Fauquier County south. Maryland and West Virginia are across the river or mountains.
Eastern Loudoun contains suburban neighborhoods, data centers, offices, shopping districts and airport-related development. Western Loudoun has smaller towns, countryside, farms and conservation areas. This contrast shapes land-use planning, transportation policy and public-service needs.
Towns and Communities
Loudoun has seven incorporated towns: Leesburg, Hamilton, Hillsboro, Lovettsville, Middleburg, Purcellville and Round Hill. Each town has its own municipal government and may provide services such as local planning, streets, police or utilities.
Large unincorporated communities include Ashburn, Sterling, Brambleton, Broadlands, Lansdowne, South Riding and Aldie. County government handles most planning, building, public safety and other local responsibilities outside the incorporated towns.
Population and Housing
The Census Bureau estimated Loudoun County’s population at 449,749 in July 2025, an increase of about 6.8% from the April 2020 estimates base. Growth continues to be concentrated mainly around Ashburn, Dulles, Brambleton, Leesburg and the Route 50 corridor.
Loudoun has a highly educated and diverse population. About 64.6% of adults aged 25 or older hold a bachelor’s degree or higher, and 27.4% of residents are foreign-born. Median household income was $181,765 for 2020–2024. The median owner-occupied home value was $743,800 and median gross rent was $2,386.
Economy and Employment
Loudoun’s economy combines technology, aviation, government contracting, professional services, healthcare, education, construction, retail, hospitality and agriculture. The county recorded 12,561 employer establishments and 192,220 jobs in 2023.
Ashburn and nearby communities contain a major concentration of data centers and digital infrastructure. The industry supplies substantial tax revenue, although energy demand, transmission facilities, noise and land use remain planning issues. Washington Dulles International Airport supports aviation, cargo, tourism and international business.
Western Loudoun contributes through wineries, breweries, farms, equestrian activities, wedding venues and heritage tourism. Leesburg is a major center for government, healthcare, retail and professional employment.
County Government and Board of Supervisors
Loudoun County is governed by a nine-member Board of Supervisors. Eight supervisors represent districts, while the chair is elected countywide. The Board adopts the budget, sets tax rates, approves land-use policies, funds public services and appoints the county administrator.
The current Board consists of Chair At-Large Phyllis J. Randall; Vice Chair and Ashburn District Supervisor Michael R. Turner; Juli E. Briskman of Algonkian; Sylvia R. Glass of Broad Run; Caleb A. Kershner of Catoctin; Matthew F. Letourneau of Dulles; Kristen C. Umstattd of Leesburg; Laura A. TeKrony of Little River; and Koran T. Saines of Sterling.
The Board adopted approximately $5.4 billion in total appropriations for county government and the school system for fiscal year 2027, which began on July 1, 2026.
County Administration and Legal Counsel
Tim Hemstreet has served as county administrator since December 2009. He directs departments under the Board’s authority, implements its decisions, coordinates the budget and oversees daily operations. His office also liaises with constitutional officers, courts and regional agencies.
Leo P. Rogers is the county attorney. His office advises the Board and county departments, drafts ordinances and represents the county in civil legal matters.
Constitutional Officers
Virginia law provides five independently elected constitutional officers in Loudoun County. The current officeholders are Sheriff Mike Chapman, Commonwealth’s Attorney Bob Anderson, Clerk of the Circuit Court Gary M. Clemens, Commissioner of the Revenue Bob Wertz and Treasurer Henry C. Eickelberg.
The Sheriff’s Office provides law enforcement, jail operations, court security and civil-process services. The Commonwealth’s Attorney prosecutes criminal cases. The clerk maintains court and land records, probate files and marriage licenses. The commissioner assesses taxable property, while the treasurer collects revenue and manages county funds.
Judiciary and Court System
Loudoun County is part of Virginia’s 20th Judicial Circuit and 20th Judicial District. The Loudoun Circuit Court handles felony criminal cases, major civil disputes, family matters, appeals, probate and other proceedings. Judge Douglas L. Fleming Jr. serves as chief judge, and Gary M. Clemens is clerk of court.
The General District Court handles traffic offenses, misdemeanors, small claims, landlord-tenant matters and lower-value civil cases. Judge Lorrie Ann Sinclair serves as its chief judge. A Juvenile and Domestic Relations District Court hears juvenile cases, custody, support, family-abuse and related matters.
Public Safety and County Services
The Sheriff’s Office is the principal law-enforcement agency. Some towns, including Leesburg and Purcellville, operate police departments. The Loudoun County Combined Fire and Rescue System, led by Chief James Williams, combines career and volunteer personnel for fire suppression, emergency medical care, rescue and hazardous-material response.
County services also include public libraries, parks, mental-health programs, family services, animal services, building inspections, waste management and emergency communications. Loudoun County Public Schools represents the largest part of local public spending.
Transportation and Infrastructure
Major road corridors include Routes 7, 15, 28 and 50, the Dulles Greenway and the Dulles Toll Road. Three Silver Line Metrorail stations are located in the county: Dulles Airport, Loudoun Gateway and Ashburn. Loudoun County Transit provides local buses, commuter services and connections to Metrorail.
Most public roads outside incorporated towns are maintained by the Virginia Department of Transportation rather than the county. Population growth continues to create pressure for road improvements, school construction, utility expansion and safer walking and cycling routes.
History, Parks and Attractions
Popular places include historic Leesburg, Morven Park, Ball’s Bluff Battlefield, Claude Moore Park, the Washington and Old Dominion Trail, Middleburg and western Loudoun’s wineries and farm markets. They reflect the county’s history, suburban growth and rural character.
Frequently Asked Questions
Q1. What is the county seat of Loudoun County?
A: Leesburg is the county seat and contains the main government offices and court complex.
Q2. Is Ashburn an incorporated town?
A: No. Ashburn is a large unincorporated community governed primarily by Loudoun County.
Q3. Who leads Loudoun County government?
A: The elected Board of Supervisors sets policy. Tim Hemstreet manages daily county operations as county administrator.
Q4. Which court handles felony cases?
A: The Loudoun Circuit Court handles felony criminal cases and other major proceedings.
Q5. Does Loudoun County have Metro service?
A: Yes. The Silver Line serves Dulles Airport, Loudoun Gateway and Ashburn stations.