- Dance Companies, Uniondale
- Delicatessen Restaurants, Uniondale
- Delivery & Errand Services, Uniondale
- Dentists, Uniondale
- Department Stores, Uniondale
- Developmental Disabilities, Uniondale
- Dieticians & Diet Counseling, Uniondale
- Diner Restaurants, Uniondale
- Dining Club Plans, Uniondale
- Direct Mail Advertising, Uniondale
- Direct Mail Advertising Services, Uniondale
- Disabled Persons Assistive Services, Uniondale
- Disc Jockeys, Uniondale
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- Discount Stores, Uniondale - Clothing, Grocery, Furniture, Etc
- Displays & Display Installation Service, Uniondale - Trade Show Displays
- Doctors, Physicians & Surgeons, Uniondale
- Dominican Restaurants, Uniondale
- Donuts, Uniondale
- Door & Gate Operating Devices, Uniondale
- Drinking Establishments, Uniondale
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Uniondale
- Dry Cleaning & Laundry, Uniondale - Dry Cleaners
- Dryers Sales, Service & Repair, Uniondale - Gas & Electric
- Dump Truck, Uniondale
- Durable & Non Durable Goods & Products, Uniondale
- Durable Goods & Products, Uniondale
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