- Dance Companies, Ashburn
- Data Communications Service, Equipment, Supplies & Sales, Ashburn
- Data Networking, Ashburn
- Data Processing Equipment & Supplies , Ashburn
- Data Processing Security Storage, Ashburn
- Data Processing Services, Ashburn
- Day Spas, Ashburn
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Ashburn
- Decorating & Designing Services, Ashburn
- Defense Consulting Agencies, Ashburn
- Defense Contractors, Ashburn
- Delicatessen Restaurants, Ashburn
- Denomination, Non-Denominational, Etcetera, Ashburn
- Dental Bonding & Cosmetic Dentistry, Ashburn - Cosmetic Dentist & Tooth Bonding
- Dentists, Ashburn
- Department Stores, Ashburn
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- Dermatologists, Ashburn - Skin Doctors, Physicians & Surgeons (Dermatology)
- Developmental Children Services, Ashburn
- Developmental Disabilities, Ashburn
- Diner Restaurants, Ashburn
- Direct Mail Advertising, Ashburn
- Direct Mail Advertising Services, Ashburn
- Disabled Persons Assistive Services, Ashburn
- Dispensing Machines, Ashburn
- Divorce & Family Law Attorneys & Lawyers, Ashburn
- Doctorate Degree, Ashburn
- Doctors, Physicians & Surgeons, Ashburn
- Donuts, Ashburn
- Drama Schools, Ashburn
- Drinking Establishments, Ashburn
- Dry Cleaning & Laundry, Ashburn - Dry Cleaners
- Drywall Contractors, Ashburn - Drywall Repair & Installation Services
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