- Day Spas, Lorton
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Lorton
- Decorating & Designing Services, Lorton
- Defense Contractors, Lorton
- Delicatessen Grocers, Lorton
- Delicatessen Restaurants, Lorton
- Delivery & Errand Services, Lorton
- Denomination, Non-Denominational, Etcetera, Lorton
- Dental Bonding & Cosmetic Dentistry, Lorton - Cosmetic Dentist & Tooth Bonding
- Dentists, Lorton
- Developmental Children Services, Lorton
- Diabetic Equipment & Supplies, Lorton
- Diabetic Equipment Supplies & Services, Lorton
- Dialysis Clinics, Lorton - Kidney Dialysis Centers
- Direct Mail Advertising, Lorton
- Direct Mail Advertising Services, Lorton
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- Dirt, Lorton
- Discount Stores, Lorton - Clothing, Grocery, Furniture, Etc
- Dispensing Machines, Lorton
- Displays & Display Installation Service, Lorton - Trade Show Displays
- Doctors, Physicians & Surgeons, Lorton
- Donuts, Lorton
- Door & Gate Operating Devices, Lorton
- Doors & Door Frames, Lorton - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Drive Shafts, Lorton
- Dry Cleaning & Laundry, Lorton - Dry Cleaners
- Drywall Contractors, Lorton - Drywall Repair & Installation Services
- Drywall Equipment & Supplies, Lorton
- Duct Work & Duct Supplies & Equipment, Lorton
- Dump Truck, Lorton
- Dumpster Rental, Lorton
- Dwelling Operators Except Apartment, Lorton
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