- Dance Companies, East Islip
- Dancing Instructions, East Islip
- Day Spas, East Islip
- Delicatessen Restaurants, East Islip
- Dentists, East Islip
- Department Stores, East Islip
- Dieticians & Diet Counseling, East Islip
- Disc Jockeys, East Islip
- Disease, Handicap & Disability Services, Organizations & Groups, East Islip
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- Doctors, Physicians & Surgeons, East Islip
- Donuts, East Islip
- Dressmakers Supplies, East Islip
- Drinking Establishments, East Islip
- Driveway, Parking Lot & Blacktop Contractors, East Islip - Construction, Repair & Maintenance
- Driving Proficiency Testing, East Islip
- Dry Cleaning & Laundry, East Islip - Dry Cleaners
- Drywall Contractors, East Islip - Drywall Repair & Installation Services
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