- Dance Companies, Newtown Square
- Data Recovery Services, Newtown Square - Hard Drive Data Recovery, etc
- Day Spas, Newtown Square
- Decorating & Designing Services, Newtown Square
- Delicatessen Restaurants, Newtown Square
- Dental Bonding & Cosmetic Dentistry, Newtown Square - Cosmetic Dentist & Tooth Bonding
- Dentists, Newtown Square
- Dentures, Newtown Square
- Dermatologists, Newtown Square - Skin Doctors, Physicians & Surgeons (Dermatology)
- Developmental Disabilities, Newtown Square
- Diner Restaurants, Newtown Square
- Direct Mail Advertising Services, Newtown Square
- Disabled Persons Assistive Services, Newtown Square
- Displays & Display Installation Service, Newtown Square - Trade Show Displays
- Distilled Water - Wholesale, Newtown Square
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- District Judges, Newtown Square
- Dock Construction - Build & Repair, Newtown Square - Dock Builders
- Doctorate Degree, Newtown Square
- Doctors, Physicians & Surgeons, Newtown Square
- Door & Gate Operating Devices, Newtown Square
- Door Installation & Repair, Newtown Square - Garage, Glass, Screen, Sliding, French, Closet, Front, Storm, Interior & Exterior Doors
- Doors & Door Frames, Newtown Square - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Drinking Establishments, Newtown Square
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Newtown Square
- Dry Cleaning & Laundry, Newtown Square - Dry Cleaners
- Dryers Sales, Service & Repair, Newtown Square - Gas & Electric
- Drywall Contractors, Newtown Square - Drywall Repair & Installation Services
- Durable & Non Durable Goods & Products, Newtown Square
- Durable Goods & Products, Newtown Square
- Dwelling Operators Except Apartment, Newtown Square
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