- Dance Companies, East Patchogue
- Data Communications Service, Equipment, Supplies & Sales, East Patchogue
- Decorating & Designing Services, East Patchogue
- Delicatessen Restaurants, East Patchogue
- Dentists, East Patchogue
- Dermatologists, East Patchogue - Skin Doctors, Physicians & Surgeons (Dermatology)
- Diet Center, East Patchogue
- Diet Centers, East Patchogue
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- Direct Mail Advertising Services, East Patchogue
- Disc Jockeys, East Patchogue
- Disease, Handicap & Disability Services, Organizations & Groups, East Patchogue
- Doctors, Physicians & Surgeons, East Patchogue
- Drainage Contractors, East Patchogue - Install & Repair Drainage Systems
- Drinking Establishments, East Patchogue
- Drugs & Pharmaceutical Supplies, East Patchogue
- Dry Cleaning & Laundry, East Patchogue - Dry Cleaners
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