| Loudoun County Public Schools | More than 10,000 | Educational Services |
| Loudoun County Government | 2,500 to 5,000 | Public Administration |
| Verizon | 2,500 to 5,000 | Information |
| Northrop Grumman | 1,000 to 2,500 | Manufacturing |
| United Airlines | 1,000 to 2,500 | Transportation and Warehousing |
| Raytheon Technologies | 1,000 to 2,500 | Manufacturing |
| Inova Loudoun Hospital | 1,000 to 2,500 | General Medical and Surgical Hospitals |
| Wal-Mart | 1,000 to 2,500 | Retail Trade |
| US Postal Service | 1,000 to 2,500 | Transportation and Warehousing |
| Dynalectric | 1,000 to 2,500 | Construction |
| Harris Teeter | 500 to 1,000 | Retail Trade |
| Bowers | 500 to 1,000 | Construction |
| Wegmans | 500 to 1,000 | Management of Companies and Enterprises |
| Universal Protection Service | 500 to 1,000 | Administrative and Support and Waste Management and Remediation Services |
| The Home Depot | 500 to 1,000 | Retail Trade |
| Costco Wholesale | 500 to 1,000 | Management of Companies and Enterprises |
| Giant Food Store | 500 to 1,000 | Retail Trade |
| Loudoun Medical Group | 500 to 1,000 | Health Care and Social Assistance |
| Transportation Security Administration | 500 to 1,000 | Public Administration |
| George Washington University | 500 to 1,000 | Educational Services |
| US Customs and Border Protection | 500 to 1,000 | Public Administration |
| Amazon | 500 to 1,000 | Transportation and Warehousing |
| Chick-Fil-A | 500 to 1,000 | Accommodation and Food Services |
| Federal Emergency Mgmt Agency | 500 to 1,000 | Public Administration |
| Ashby Ponds | 500 to 1,000 | Health Care and Social Assistance |
| FAA | 500 to 1,000 | Transportation and Warehousing |
| Target | 500 to 1,000 | Retail Trade |
| Metro Washington Airports Authority | 500 to 1,000 | Transportation and Warehousing |
| Swissport | 500 to 1,000 | Transportation and Warehousing |
| Howard Hughes Medical Institute | 500 to 1,000 | Professional, Scientific, and Technical Services |
| Northern Virginia Community College | 500 to 1,000 | Public Administration |
| McDonald's | 500 to 1,000 | Accommodation and Food Services |
| Rosendin Electric | 500 to 1,000 | Construction |
| JK Moving & Storage | 100 to 500 | Transportation and Warehousing |
| Prospect Waterproofing | 100 to 500 | Construction |
| Air Serv Corp | 100 to 500 | Transportation and Warehousing |
| Neustar | 100 to 500 | Information |
| Southland Industries | 100 to 500 | Construction |
| ATPCO | 100 to 500 | Information |
| JE Richards Inc | 100 to 500 | Construction |
| TJ Maxx | 100 to 500 | Retail Trade |
| Inovant | 100 to 500 | Finance and Insurance |
| ViaSystems | 100 to 500 | Manufacturing |
| Starbucks Coffee | 100 to 500 | Accommodation and Food Services |
| REI Systems | 100 to 500 | Professional, Scientific, and Technical Services |
| Discovery Productions Group | 100 to 500 | Information |
| NALC HBP | 100 to 500 | Finance and Insurance |
| Lowe's | 100 to 500 | Retail Trade |
| Town of Leesburg | 100 to 500 | Public Administration |
| Loudoun Water | 100 to 500 | Utilities |
| Stryker | 100 to 500 | Manufacturing |
| Mesa Airlines | 100 to 500 | Transportation and Warehousing |
| Asurion Insurance Services | 100 to 500 | Finance and Insurance |
| Visa | 100 to 500 | Finance and Insurance |
| Fedex | 100 to 500 | Transportation and Warehousing |
| Christos Building Services | 100 to 500 | Administrative and Support and Waste Management and Remediation Services |
| Meadows Farms | 100 to 500 | Management of Companies and Enterprises |
| Toll Brothers | 100 to 500 | Construction |
| Falcons Landing | 100 to 500 | Health Care and Social Assistance |
| National Rural Utilities Cooperative Finance Corporation | 100 to 500 | Finance and Insurance |
| Lowers Risk Group | 100 to 500 | Administrative and Support and Waste Management and Remediation Services |
| Telos Corp | 100 to 500 | Professional, Scientific, and Technical Services |
| PAE Shared Services | 100 to 500 | Administrative and Support and Waste Management and Remediation Services |
| Northern Virginia Community Hospital | 100 to 500 | Health Care and Social Assistance |
| MLSC | 100 to 500 | Administrative and Support and Waste Management and Remediation Services |
| Walgreens | 100 to 500 | Retail Trade |
| FHWA | 100 to 500 | Public Administration |
| Washington Football Team | 100 to 500 | Arts, Entertainment, and Recreation |
| Leidos | 100 to 500 | Professional, Scientific, and Technical Services |
| Collins Aerospace | 100 to 500 | Professional, Scientific, and Technical Services |
| Champlain Enterprises | 100 to 500 | Transportation and Warehousing |
| Asurion Services | 100 to 500 | Finance and Insurance |
| Troon Golf | 100 to 500 | Arts, Entertainment, and Recreation |
| CACI | 100 to 500 | Professional, Scientific, and Technical Services |
| Hardesty Concrete Construction | 100 to 500 | Construction |
| DLR | 100 to 500 | Real Estate and Rental and Leasing |
| Baker DC | 100 to 500 | Construction |
| Bechtel Infrastructure | 100 to 500 | Professional, Scientific, and Technical Services |
| Discovery Communications | 100 to 500 | Information |
| Healthsouth Rehab Hospital of Northern VA | 100 to 500 | Health Care and Social Assistance |
| Domino's Pizza | 100 to 500 | Accommodation and Food Services |
| Whisper Ridge Behavioral Health | 100 to 500 | Health Care and Social Assistance |
| Chipotle Mexican Grill | 100 to 500 | Accommodation and Food Services |
| Food Lion | 100 to 500 | Retail Trade |
| 7-Eleven | 100 to 500 | Retail Trade |
| BAE Systems | 100 to 500 | Professional, Scientific, and Technical Services |
| Carmax | 100 to 500 | Retail Trade |
| Patrick Henry College | 100 to 500 | Educational Services |
| R B Hinkle Construction | 100 to 500 | Construction |
| Forfeiture Support Associates | 100 to 500 | Administrative and Support and Waste Management and Remediation Services |
| Safeway | 100 to 500 | Retail Trade |
| Reston Limousine | 100 to 500 | Transportation and Warehousing |
| Best Buy | 100 to 500 | Retail Trade |
| Bureau of Safety and Environmental Enforcement | 100 to 500 | Public Administration |
| Chapel Valley Landscape | 100 to 500 | Administrative and Support and Waste Management and Remediation Services |
| Heritage Hall Health Care | 100 to 500 | Health Care and Social Assistance |
| FTS International | 100 to 500 | Professional, Scientific, and Technical Services |
| Benchmark Utility Services | 100 to 500 | Construction |
| Whole Foods | 100 to 500 | Retail Trade |
| Southland Corporation Tex | 100 to 500 | Retail Trade |
| Systems Technology Forum Limit | 100 to 500 | Professional, Scientific, and Technical Services |
| Compusearch Software | 100 to 500 | Professional, Scientific, and Technical Services |
| Netimpact Strategies | 100 to 500 | Professional, Scientific, and Technical Services |
| Jetblue Airways | 100 to 500 | Transportation and Warehousing |
| Community Landscape Services | 100 to 500 | Administrative and Support and Waste Management and Remediation Services |
| Truist Financial Corp | 100 to 500 | Finance and Insurance |
| CVS Pharmacy | 100 to 500 | Retail Trade |
| Panera Bread | 100 to 500 | Accommodation and Food Services |
| Patriot Development Corp | 100 to 500 | Construction |
| MVM International | 100 to 500 | Administrative and Support and Waste Management and Remediation Services |
| Dulles Motor Cars | 100 to 500 | Retail Trade |
| Dept of Alcoholic Beverage Control | 100 to 500 | Public Administration |
| Performance Contracting | 100 to 500 | Construction |
| Bureau of Ocean Energy Mgt | 100 to 500 | Public Administration |
| Wells Fargo Bank | 100 to 500 | Finance and Insurance |
| Global Wireless Solutions | 100 to 500 | Professional, Scientific, and Technical Services |
| Facebook | 100 to 500 | Professional, Scientific, and Technical Services |
| Microsoft | 100 to 500 | Wholesale Trade |
| Comcast | 100 to 500 | Information |
| Brightstar Care of Leesburg | 100 to 500 | Health Care and Social Assistance |
| Ian Evan & Alexander | 100 to 500 | Professional, Scientific, and Technical Services |
| Airway Sheet Metal Company | 100 to 500 | Construction |
| Papa Johns | 100 to 500 | Accommodation and Food Services |
| Gettier Commercial | 100 to 500 | Administrative and Support and Waste Management and Remediation Services |
| American Green/Norfolk Naval Base | 100 to 500 | Administrative and Support and Waste Management and Remediation Services |
| Cameron Glen Health & Rehab Center | 100 to 500 | Health Care and Social Assistance |
| Anderson Mechanical Services | 100 to 500 | Construction |
| Equinix Operating Co | 100 to 500 | Information |
| Unanet Technologies | 100 to 500 | Professional, Scientific, and Technical Services |
| Luck Stone | 100 to 500 | Management of Companies and Enterprises |
| Mindshift Technologies | 100 to 500 | Professional, Scientific, and Technical Services |
| Bakeco | 100 to 500 | Manufacturing |
| Care Advantage | 100 to 500 | Health Care and Social Assistance |
| Gatr Technologies | 100 to 500 | Professional, Scientific, and Technical Services |
| Satair USA | 100 to 500 | Wholesale Trade |
| Macy's | 100 to 500 | Retail Trade |
| Hunt Leigh USA | 100 to 500 | Transportation and Warehousing |
| Ex Zel Janitorial Service | 100 to 500 | Administrative and Support and Waste Management and Remediation Services |
| Blue Ridge Grill | 100 to 500 | Accommodation and Food Services |
| SA Halac Iron Works | 100 to 500 | Construction |
| Brightview Landscape Services | 100 to 500 | Administrative and Support and Waste Management and Remediation Services |
| Singh Senior Living | 100 to 500 | Real Estate and Rental and Leasing |
| Central Pharmacy | 100 to 500 | Health Care and Social Assistance |
| CIS Secure Computing | 100 to 500 | Professional, Scientific, and Technical Services |
| Enterprise Leasing Company | 100 to 500 | Management of Companies and Enterprises |
| Arthur Construction Co | 100 to 500 | Construction |
| Inspiration Plumbing Company | 100 to 500 | Construction |
| Heritage Landscape Service | 100 to 500 | Administrative and Support and Waste Management and Remediation Services |
| IPA | 100 to 500 | Professional, Scientific, and Technical Services |
| BMW of Sterling | 100 to 500 | Retail Trade |
| Wendy's | 100 to 500 | Accommodation and Food Services |
| EIT | 100 to 500 | Manufacturing |
| PWP Blue Ridge | 100 to 500 | Professional, Scientific, and Technical Services |
| CSI International | 100 to 500 | Administrative and Support and Waste Management and Remediation Services |
| Capital Caring | 100 to 500 | Health Care and Social Assistance |
| Salamander Resort | 100 to 500 | Accommodation and Food Services |
| Steritech | 100 to 500 | Administrative and Support and Waste Management and Remediation Services |
| SBM Site Services | 100 to 500 | Administrative and Support and Waste Management and Remediation Services |
| Home School Foundation | 100 to 500 | Other Services (except Public Administration) |
| Falcon Heating & AC | 100 to 500 | Construction |
| K T Enterprise | 100 to 500 | Administrative and Support and Waste Management and Remediation Services |
| Belfort Furniture | 100 to 500 | Retail Trade |
| Valet Waste | 100 to 500 | Administrative and Support and Waste Management and Remediation Services |
| Morningside House of Cardinal Villa | 100 to 500 | Health Care and Social Assistance |
| Datasync | 100 to 500 | Professional, Scientific, and Technical Services |
| Leesburg Honda | 100 to 500 | Retail Trade |
| Jenkins Restorations | 100 to 500 | Construction |
| Iridium Satellite | 100 to 500 | Information |
| Beckstrom Electric | 100 to 500 | Construction |
| Koons Sterling Ford | 100 to 500 | Retail Trade |
| Am Liner East | 100 to 500 | Construction |
| Richards Corporation | 100 to 500 | Manufacturing |
| US Airways Express | 100 to 500 | Transportation and Warehousing |
| Liscr | 100 to 500 | Administrative and Support and Waste Management and Remediation Services |
| Macedon Technologies | 100 to 500 | Information |
| Trugreen Limited Partnership | 100 to 500 | Administrative and Support and Waste Management and Remediation Services |
| Manhattan Pizza | 100 to 500 | Accommodation and Food Services |
| Guernsey | 100 to 500 | Wholesale Trade |
| Patent and Trademark Office | 100 to 500 | Public Administration |
| Inova Loudoun Long Term Care | 100 to 500 | Health Care and Social Assistance |
| A & A Transfer Company | 100 to 500 | Transportation and Warehousing |
| Comsearch Division | 100 to 500 | Professional, Scientific, and Technical Services |
| Virginia Cleaning | 100 to 500 | Administrative and Support and Waste Management and Remediation Services |
| Sheetz | 100 to 500 | Retail Trade |
| Zillion Technologies | 100 to 500 | Professional, Scientific, and Technical Services |
| Global Com | 100 to 500 | Manufacturing |
| Schaffner Mtc | 100 to 500 | Manufacturing |
| Orbcomm | 100 to 500 | Information |
| Ragingwire Data Centers | 100 to 500 | Information |