- Dairy Farms, Reston
- Dairy Products - Wholesale & Retail, Reston
- Dance Companies, Reston
- Data Communications Service, Equipment, Supplies & Sales, Reston
- Data Networking, Reston
- Data Processing Security Storage, Reston
- Data Processing Services, Reston
- Data Recovery Services, Reston - Hard Drive Data Recovery, etc
- Day Spas, Reston
- Decorating & Designing Services, Reston
- Defense Consulting Agencies, Reston
- Defense Contractors, Reston
- Delicatessen Restaurants, Reston
- Delivery & Errand Services, Reston
- Denomination, Non-Denominational, Etcetera, Reston
- Dental Bonding & Cosmetic Dentistry, Reston - Cosmetic Dentist & Tooth Bonding
- Dental Emergency Service, Reston
- Dental Hygienists, Reston
- Dentists, Reston
- Department Stores, Reston
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- Dermatologists, Reston - Skin Doctors, Physicians & Surgeons (Dermatology)
- Designers, Reston
- Desktop Publishing, Reston
- Dessert Restaurants, Reston
- Developmental Children Services, Reston
- Diabetes Doctors, Reston - Endocrinologists Physicians & Surgeons
- Digital Printing & Imaging Service, Reston
- Diner Restaurants, Reston
- Direct Mail Advertising Services, Reston
- Direct Marketing, Reston
- Discount Stores, Reston - Clothing, Grocery, Furniture, Etc
- Dispensing Machines, Reston
- Doctorate Degree, Reston
- Doctors, Physicians & Surgeons, Reston
- Donuts, Reston
- Drapery Blinds & Shades Installation & Repair, Reston
- Drinking Establishments, Reston
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Reston
- Dry Cleaning & Laundry, Reston - Dry Cleaners
- Dwelling Operators Except Apartment, Reston
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