- Laboratories Dental, Lorton
- Laboratories Medical, Lorton
- Laminating Services, Lorton
- Land Surveyor, Lorton - Land Surveying Services
- Landscape Contractors & Designers, Lorton
- Landscape Design & Installation, Lorton
- Landscape Garden Services, Lorton
- Landscaping, Lorton
- Landscaping Materials & Supplies, Lorton
- Laser Printers, Lorton - Office Supplies
- Late Night Restaurants, Lorton
- Lawn & Garden Equipment & Supplies, Lorton
- Lawn & Garden Services, Lorton
- Lawn Maintenance Services, Lorton
- Lawn Mower Repair & Blade Sharpening Service, Lorton
- Lawn Mowers & Power Equipment, Lorton
- Lawyers & Attorneys, Lorton
- Leather Apparel Goods Manufacturers, Lorton
- Leather Goods, Lorton
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- Legal & Tax Services, Lorton
- Legal Professionals, Lorton
- Libraries, Lorton
- Life Insurance, Lorton
- Lighting Consultants, Lorton
- Lighting Consultants & Designers, Lorton
- Lighting Contractors, Lorton
- Limousine Service, Lorton
- Liquor & Beer Manufacturers, Lorton
- Liquor Stores, Lorton
- Loans Personal, Lorton
- Locks, Lorton
- Locksmiths, Lorton - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Lorton
- Lodging, Lorton
- Long Haul Trucking Companies, Lorton
- Lumber & Lumber Products, Lorton
- Lumber & Lumber Products, Lorton
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