- Dairy Products - Manufacturers, Amityville
- Dairy Products - Wholesale & Retail, Amityville
- Dams, Waterways, & Docks Contractors, Amityville
- Dance Companies, Amityville
- Dancing Instructions, Amityville
- Day Spas, Amityville
- Decorating & Designing Services, Amityville
- Delicatessen Restaurants, Amityville
- Denomination, Non-Denominational, Etcetera, Amityville
- Dentists, Amityville
- Dermatologists, Amityville - Skin Doctors, Physicians & Surgeons (Dermatology)
- Developmental Disabilities, Amityville
- Dialysis Clinics, Amityville - Kidney Dialysis Centers
- Diner Restaurants, Amityville
- Direct Mail Advertising, Amityville
- Discount Stores, Amityville - Clothing, Grocery, Furniture, Etc
- Dispensing Machines, Amityville
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- Display Fixtures & Materials, Amityville
- Displays & Display Installation Service, Amityville - Trade Show Displays
- Doctorate Degree, Amityville
- Doctors, Physicians & Surgeons, Amityville
- Donuts, Amityville
- Door & Gate Operating Devices, Amityville
- Door Installation & Repair, Amityville - Garage, Glass, Screen, Sliding, French, Closet, Front, Storm, Interior & Exterior Doors
- Doors & Door Frames, Amityville - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Drafting Services, Amityville
- Drinking Establishments, Amityville
- Drugs & Pharmaceutical Supplies, Amityville
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Amityville
- Dry Cleaning & Laundry, Amityville - Dry Cleaners
- Drywall Contractors, Amityville - Drywall Repair & Installation Services
- Drywall Equipment & Supplies, Amityville
- Durable & Non Durable Goods & Products, Amityville
- Durable Goods & Products, Amityville
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