- Dams, Waterways, & Docks Contractors, West Islip
- Dance Companies, West Islip
- Dance Instruction Night Club, West Islip
- Day Camps, West Islip
- Day Spas, West Islip
- Decorating & Designing Services, West Islip
- Delicatessen Restaurants, West Islip
- Dental Bonding & Cosmetic Dentistry, West Islip - Cosmetic Dentist & Tooth Bonding
- Dental Temporo Mandibular Joint & Facial Pain Treatment, West Islip - Dental TMJ
- Dentists, West Islip
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- Dermatologists, West Islip - Skin Doctors, Physicians & Surgeons (Dermatology)
- Diner Restaurants, West Islip
- Discount Stores, West Islip - Clothing, Grocery, Furniture, Etc
- Dock Construction - Build & Repair, West Islip - Dock Builders
- Doctors, Physicians & Surgeons, West Islip
- Donuts, West Islip
- Drinking Establishments, West Islip
- Dry Cleaning & Laundry, West Islip - Dry Cleaners
- Durable & Non Durable Goods & Products, West Islip
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