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Virginia · Northern Virginia · Washington DC Metro · #129 Most Populous County in the US
Loudoun County, Virginia
Consistently the wealthiest county in the United States by median household income - Ashburn, Leesburg, Dulles Airport, and more than half of the world's internet traffic flowing through the data centers of the Loudoun County "Data Center Alley." Virginia wine country, equestrian estates, and one of the fastest-growing counties in America. Property tax, courts, public records, probate, and senior services for Loudoun County residents.
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Loudoun County's assessment ratio means effective tax rates are low — but incorrect appraisals still cost money. Ownwell manages the appeal with no upfront cost.
Office: Loudoun County Office of Emergency Management, Safety & Security – P.O. Box 7100, Leesburg, VA 20177 | 801 Sycolin Road SE, Suite 100, Leesburg, VA 20175 | (703) 737-8200
Alert System: Alert Loudoun – sign up via the county website; the county also posts operating status updates via Facebook and X
Notes: The office offers unpaid internship opportunities for students interested in emergency management. Blasting complaints or concerns about property safety after a nearby blast go through the Emergency Communication Center (ECC), (703) 777-0637, requesting a Fire Marshal; the county aims to respond to all such complaints within 24 hours.
Roads & Utilities
ROADS & TRANSPORTATION
Roads: The Dulles Greenway (Route 267) runs through Ashburn, Sterling, and Leesburg; Dulles International Airport sits in the county
Transit: Metro’s Silver Line extension reaches into eastern Loudoun County (Ashburn/Loudoun Gateway stations), connecting to the broader DC Metro system
Business & Permits
BUILDING & PERMITS
Office: Loudoun County Department of Building and Development – Permitting and Land Development Counters, 1 Harrison Street SE, 2nd Floor, Leesburg, VA 20175 | (703) 777-0220 (V/TTY) | Hours: Monday–Friday, 8:30 AM–5:00 PM
Building Plan Review & Inspections: Rehau Facility, 1503 Edwards Ferry Road NE, Suite 300, Leesburg, VA 20176 | (703) 777-0220 | Hours: Monday–Friday, 8:00 AM–4:00 PM
Services: The county issues building and grading permits countywide, plus zoning permits for properties OUTSIDE the 7 incorporated towns; applications, plan submittals, and inspection scheduling handled through LandMARC, the county’s online land management system
Notes: County zoning approval does NOT substitute for approvals still required from an incorporated town, HOA, or POA – always check with the relevant town or association separately if your property falls within one. Mailed paper permit applications go to P.O. Box 7000, Leesburg, VA 20177-7000 – these forms are not accepted via email or fax.
Veterans Services
VETERANS SERVICES
State VSO: Virginia Department of Veterans Services – dvs.virginia.gov (statewide office locator for the nearest Veterans Service Representative)
Notes: Confirm current local point of contact directly with dvs.virginia.gov
Libraries
LIBRARIES
System: Loudoun County Public Library
Notes: Confirm current branch locations and hours directly via loudoun.gov, as detailed branch-by-branch information was limited in available sources; the county’s libraries have been noted regionally for their quality, closely tied to the county’s strong commercial tax base
Parks & Recreation
PARKS & RECREATION
Key Assets: Loudoun County, specifically the Ashburn-Sterling corridor, is genuinely “Data Center Alley” – the densest concentration of data centers anywhere in the world, hosting infrastructure for AWS, Microsoft Azure, Google Cloud, Meta, and dozens of others, with an estimated 35-70% of global internet traffic (sources vary) passing through the corridor daily; the county has more than 130 operating data centers totaling over 35 million square feet as of 2025-2026, contributing roughly 38-40% of the county’s total tax revenue; the industry took root after AOL built its headquarters in Loudoun in 1996, and the county deliberately marketed itself as “Data Center Alley” starting around 2008 as part of a strategic commercial-tax-base initiative
Notes: This is a genuinely significant and still-evolving local economic story, not a minor detail – data center expansion has become a major regional policy debate given rising electricity demand and grid capacity constraints, and residents may find this context directly relevant to utility costs, zoning debates, and new development they encounter locally. Loudoun’s wine country and historic villages in the western part of the county remain a separate, quieter draw – confirm current park and vineyard information directly via visitloudoun.org
GIS & Maps
GIS & MAPS
GIS Portal: Loudoun County GIS – accessible via loudoun.gov
Parcel Search: Loudoun County Real Estate Assessments records
Addressing/911: Coordinated through Loudoun County Emergency Management
Animal Services
ANIMAL SERVICES
Facility: Loudoun County Animal Services (LCAS) – 42225 Adoption Drive, Leesburg, VA 20175 | (703) 777-0406
Hours: Adoptions 11:00 AM–5:30 PM daily (last new adoption started by 5:30 PM; general kennel viewing until 6:00 PM close)
Services: Operates the county shelter for surrendered/stray animals, adoption services, and a “Tag! You’re Home!” lost-and-found program (recently honored by the National Association of Counties); Humane Law Enforcement Officers enforce local/state animal laws and investigate cruelty; regular low-cost vaccination and microchip clinics; dog licensing; the shelter follows all county government closing/delay announcements
Notes: The county shares a facility name change history – the shelter and community resource center relocated to its current Leesburg location as part of a larger county investment. A separate independent nonprofit, Humane Society of Loudoun County, also serves the region – confirm which organization applies to your specific need.
Environmental & Waste
ENVIRONMENTAL / WASTE MANAGEMENT
Environmental Complaints: Virginia Department of Environmental Quality – deq.virginia.gov
Notes: Contact Loudoun County Solid Waste Management directly for current refuse collection and recycling program details, as specifics were not independently confirmed for this entry; data center water usage (nearly 1 billion gallons in 2023) has become a notable local environmental discussion point
NOTES
Loudoun County is genuinely the epicenter of the global data center industry – “Data Center Alley” in Ashburn is the densest concentration of data centers anywhere in the world, an industry that now funds a substantial share of the county’s budget and shapes ongoing local debates over land use, electricity demand, and water consumption. This is directly relevant context for residents navigating zoning, utility costs, or new development in the county, not just a curiosity. All contact information above was sourced from official county pages as of this writing; phone numbers and hours should be reconfirmed directly with the relevant office before a visit.
About Loudoun County
Loudoun County holds a distinction that turns heads in every discussion of American wealth geography: it is routinely ranked the wealthiest county in the United States by median household income, at approximately $181,000 in 2024. This is not a fluke of geography or a small enclave of wealthy households – it reflects the structural concentration of high-income technology, federal contracting, and financial services employment in Northern Virginia’s technology corridor, combined with a large professional class of dual-income households with advanced degrees working in the DC metro area.
The engine behind this wealth concentration is Data Center Alley – the stretch of Loudoun County (primarily in and around Ashburn) that contains more data center capacity than any other place on earth. More than 70% of the world’s internet traffic is estimated to pass through Loudoun County’s data centers on any given day. Amazon Web Services, Microsoft Azure, Google Cloud, Meta, and virtually every other major technology company maintain massive server farms here, attracted by the county’s fiber infrastructure (the original MAE-East internet exchange point was located in Ashburn), reliable power, and proximity to federal government agencies in Washington and Northern Virginia. The data center industry generates enormous tax revenue for Loudoun County – enabling world-class schools, infrastructure, and services while keeping residential property tax rates relatively moderate compared to assessed values.
The county’s other economic pillars: Washington Dulles International Airport sits largely within Loudoun County, making it a gateway for international travel and a hub for aviation-related employment. The Silver Line Metrorail extension (Phase 2, opened November 2022) now connects Loudoun County to Washington’s Metro system for the first time, with stations at Ashburn and Loudoun Gateway.
Loudoun County’s western portion is a distinctly different landscape – rolling piedmont farms, vineyard estates, and the horse country of the Loudoun Hunt and the National Sporting Library and Museum in Middleburg (shared with adjacent Fauquier County). The county is home to more than 40 licensed wineries and is part of the Virginia Wine Country that stretches from Loudoun through the Shenandoah Valley. This rural/suburban contrast gives Loudoun County an unusual character – tech corridor and horse country within the same county boundaries.
County government is a nine-member Board of Supervisors with a County Administrator. The Commissioner of the Revenue, Treasurer, Clerk of Circuit Court, Sheriff, Commonwealth’s Attorney, and Commissioner of Elections are separately elected.
All Services
Browse every category and topic available for this county.
Loudoun County conducts annual assessments of all real property at 100% of estimated fair market value as of January 1. Assessment notices are mailed in January each year. The Loudoun County Office of the Commissioner of Revenue – Real Property Assessment (1 Harrison Street SE, Leesburg, 703-777-0357) is responsible for determining all real property values.
Loudoun County’s consistently appreciating real estate market – driven by data center land demand, tech corridor residential demand, and Metro access – means assessed values tend to track market closely. However, properties in transitional areas, unique properties, rural estates, or homes with functional obsolescence may be assessed above market.
The two-step appeal process:
Step 1 – Informal Review (with the Commissioner of Revenue / Assessor): Contact the Real Property Assessment office to discuss your assessment informally. Deadline for submitting a formal Request for Review is April 30. Staff will review comparables and your concerns and respond in writing. The outcome may be a decrease, no change, or increase.
Step 2 – Board of Equalization (BOE): File with the Loudoun County Board of Equalization by June 30. The BOE is a separate independent body – appearance is NOT required. File your evidence (comparable sales, appraisal, property condition documentation) and the BOE will hear the appeal. The BOE can raise, lower, or affirm the assessment. Assessment is presumed correct; the burden is on you to provide substantial evidence of error.
After the BOE, appeal to the Loudoun County Circuit Court within 3 months of the BOE decision.
Senior and disabled relief: Loudoun County administers its own Real Property Tax Relief for the Elderly and Disabled program under Virginia Code §58.1-3210. Income and net worth limits are set locally by the Board of Supervisors. Apply through the Commissioner of the Revenue (703-777-0260). The 2025 amendments to Virginia Code changed how defined contribution retirement account balances (IRAs, 401(k)s) count toward net worth limits – if you were previously ineligible due to retirement account balances, reapply under the updated methodology.
Virginia has no state estate tax (eliminated 2006) and no inheritance tax. Virginia recognizes Transfer on Death deeds for real property.
OWNWELL CTA: Loudoun County’s real estate market has appreciated dramatically – annual assessment tracks market. BOE deadline June 30; no appearance required. Senior relief income/net worth limits set locally – 2025 Virginia changes to retirement account counting in net worth calculations may make previously ineligible seniors now qualify. No VA estate or inheritance tax. Ownwell manages the appeal with no upfront cost.
Recommended
Loudoun County's real estate market has appreciated dramatically - annual assessment tracks market. BOE deadline June 30; no appearance required. Senior relief income/net worth limits set locally - 2025 Virginia changes to retirement account counting in net worth calculations may make previously ineligible seniors now qualify. No VA estate or inheritance tax. Ownwell manages the appeal with no upfront cost.
Courts & Legal
Courts & Legal
The Loudoun County Circuit Court at 18 E. Market Street, Leesburg (703-777-0270) handles all civil, criminal, family, and probate matters. The Loudoun County Clerk of Circuit Court at 18 E. Market Street, Leesburg (703-777-0270) maintains all court records and land records – deeds, mortgages, and recorded documents – searchable online at loudoun.gov. The Clerk of Court processes all probate filings.
Virginia probate: bring original will, certified death certificate, and list of heirs. For small estates under $50,000 with no real property, a Small Estate Affidavit may be used. Virginia’s Uniform Disposition of Community Property Act assists couples moving from community property states.
Data center and technology estate planning: Loudoun County’s concentration of technology executives, AWS/Microsoft/Google engineers, federal contractors, and financial services professionals creates estate planning dynamics of unusual sophistication. Stock-based compensation – RSUs, ISOs, NQSOs – from publicly traded technology companies represents a large portion of many households’ net worth and requires careful planning around timing, tax basis, and beneficiary designation. Deferred compensation plans (§409A) with large balances are common among senior executives. Virginia does not impose estate or inheritance tax, but federal estate tax above ~$13.9 million (2025) applies to larger estates. The sunsetting of the Tax Cuts and Jobs Act after 2025 could halve the federal exemption to approximately $7 million – significant numbers of Loudoun County households could be affected.
Equestrian and agricultural estate planning: Loudoun County’s western farmland and equestrian estates involve Virginia Land Use Tax programs (reduced assessments for agricultural use under Virginia Code §58.1-3230), conservation easements (Loudoun County ranks among the highest in Virginia for land under conservation easement), and complex family farm succession planning.
Senior Services: The Loudoun County Adult and Senior Services (703-777-0257) at 102 Heritage Way NE, Leesburg coordinates senior centers, home-delivered meals, transportation, VICAP Medicare counseling (Virginia’s SHIP program), caregiver support, Adult Protective Services, and connections to Virginia Medicaid long-term care programs.
Marriage & Vital Records
Marriage licenses, divorce records, and birth & death certificates are handled by the following office(s):
CIRCUIT COURT CLERK
18 East Market St, Leesburg, VA 20176
(703) 777-0270
Genealogy
County-level record sources
Loudoun Circuit Court Clerk’s Office, Leesburg (probate/estate case files – see Probate section above). Loudoun maintains its own dedicated Historic Records & Deed Research division, a notable local resource for genealogical and land-record research.
Local societies
No dedicated Loudoun County genealogical society was confirmed in available directories.
Probate & Estate
Losing someone and having to deal with courts and paperwork at the same time is hard. This section won’t make that easier, but it should tell you what to expect, what it costs, and where to go – so at least you’re not walking in blind.
Where to go
Loudoun Circuit Court, Attn: Probate Division 18 East Market Street, PO Box 550, Leesburg, VA 20176 (703) 777-0270
Loudoun County was founded in 1757, named for John Campbell, 4th Earl of Loudoun, in Northern Virginia, Virginia’s third-most populous county, county seat Leesburg. Virginia has NO separate probate court – probate (“qualification”) is handled entirely by the Circuit Court Clerk’s Office, which maintains a dedicated Probate Division and Historic Records & Deed Research unit.
Step 1: figure out which path applies
Virginia calls the probate process “qualification” rather than “appointment,” and it happens administratively at the Circuit Court Clerk’s Office, not before a judge, unless a dispute arises.
Small Estate Affidavit (Va. Code § 64.2-601, the “Virginia Small Estate Act”) – available when the decedent’s entire personal probate estate (excluding real estate) does not exceed $75,000, at least 60 days have passed since death, and no personal representative has been appointed or has a pending application in any jurisdiction. If a will exists, it must first be admitted to probate (recorded with the Clerk) even though no executor is appointed. As of July 1, 2026, the affidavit must be filed on the statewide form (CC-1685).
Single Small Asset Release (Va. Code § 64.2-602) – any person or institution holding a single asset of $35,000 or less may release it directly to a successor once 60 days have passed since death and no personal representative has qualified, without any affidavit required at all.
Real Estate Affidavit (Form CC-1612) – if the decedent owned only real estate, this can be recorded directly in land records without full probate. Real estate generally cannot be transferred through the small estate affidavit process.
Full Qualification / Administration – the standard path for larger or more complex estates. The personal representative appears before the Clerk, takes an oath, files the will and death certificate, and typically posts a surety bond. The estate is then supervised by a Commissioner of Accounts throughout administration.
Step 2: filing for administration
The person seeking to qualify as executor or administrator brings the original will (if any) and a certified death certificate to the Loudoun Circuit Court Probate Division.
The Clerk reviews the will’s validity and admits it to probate.
The personal representative takes an oath and qualifies, posting a bond if required; the Clerk issues Letters Testamentary or Letters of Administration.
The Commissioner of Accounts oversees the estate going forward.
The personal representative notifies creditors, pays valid debts, and manages estate assets.
Remaining assets are distributed to beneficiaries or heirs, and the estate is closed once final accounting is approved.
What it costs
Virginia imposes a PROBATE TAX on most wills admitted to probate and grants of administration: $1 state tax + $0.33 local tax for every $1,000 of estate value. No tax is imposed on estates valued at $15,000 or less.
Filing fees for qualification vary by estate size; confirm current Loudoun County fees directly.
Virginia does NOT impose a state estate tax or inheritance tax – repealed for deaths on or after July 1, 2007. Only the federal estate tax may apply, and only to very large estates.
Probate filings, estate administration, and guardianship matters are handled by the following office(s):
Public Safety & Arrests
Arrest records, inmate search, and law enforcement services are handled by the following office(s):
SHERIFF
803 Sycolin Rd SE, Leesburg, VA 20175
(703) 777-0407
Elections & Voting
Voter registration, polling locations, and elections information are handled by the following office(s):
VOTER REGISTRAR
750 Miller Dr SE, Leesburg, VA 20175
(703) 737-8300
ELECTIONS
Loudoun County Electoral Board, 750 Miller Dr SE, Leesburg, VA 20175
(703) 737-8300
Health & Human Services
Offices & Contacts
Health services, social services, and assistance programs are handled by the following office(s):
Health Department
102 Heritage Way NE, Leesburg, VA 20176
(703) 777-0234
Department of Family Services
102 Heritage Way NE, Leesburg, VA 20176
(703) 777-0353
Public Health Information
PUBLIC HEALTH
Office: Loudoun County Health Department (Virginia Department of Health)
Services: Immunizations, WIC, environmental health, vital records
Notes: Given the county’s large, fast-growing population, health services here operate at greater scale than in smaller VA localities – confirm current program details directly
Editorial independence: CountyOffices maintains strict editorial independence from our affiliate partners. Our content is researched from official government sources. Affiliate relationships do not influence our recommendations or the information we publish.
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