- Dairy Farms, East Northport
- Dance Companies, East Northport
- Day Spas, East Northport
- Debt Adjusters, East Northport
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, East Northport
- Decorating & Designing Services, East Northport
- Delicatessen Restaurants, East Northport
- Dental Bonding & Cosmetic Dentistry, East Northport - Cosmetic Dentist & Tooth Bonding
- Dentists, East Northport
- Department Stores, East Northport
- Diesel, East Northport - Engine Fuels, Oils & Lubricants
- Direct Mail Advertising Services, East Northport
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- Discount Stores, East Northport - Clothing, Grocery, Furniture, Etc
- Doctorate Degree, East Northport
- Doctors, Physicians & Surgeons, East Northport
- Donuts, East Northport
- Door & Gate Operating Devices, East Northport
- Drafting Services, East Northport
- Drinking Establishments, East Northport
- Dry Cleaning & Laundry, East Northport - Dry Cleaners
- Dry Well Contractors, East Northport
- Dryers Sales, Service & Repair, East Northport - Gas & Electric
- Durable & Non Durable Goods & Products, East Northport
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