- Dance Companies, Rockville Centre
- Dance Shoes, Rockville Centre
- Data Processing Services, Rockville Centre
- Day Spas, Rockville Centre
- Decorating & Designing Services, Rockville Centre
- Delicatessen Restaurants, Rockville Centre
- Denomination, Non-Denominational, Etcetera, Rockville Centre
- Dentists, Rockville Centre
- Department Stores, Rockville Centre
- Dermatologists, Rockville Centre - Skin Doctors, Physicians & Surgeons (Dermatology)
- Developmental Children Services, Rockville Centre
- Developmental Disabilities, Rockville Centre
- Developmentally Disabled Information & Services, Rockville Centre
- Diner Restaurants, Rockville Centre
- Direct Mail Advertising Services, Rockville Centre
- Direct Newspaper Sales & Delivery, Rockville Centre
- Direct Selling Businesses, Rockville Centre
- Disabled Persons Assistive Services, Rockville Centre
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- Dispensing Machines, Rockville Centre
- Display Fixtures & Materials, Rockville Centre
- Displays & Display Installation Service, Rockville Centre - Trade Show Displays
- Divers & Diving Professionals, Rockville Centre
- Doctorate Degree, Rockville Centre
- Doctors, Physicians & Surgeons, Rockville Centre
- Donuts, Rockville Centre
- Door & Gate Operating Devices, Rockville Centre
- Door Glass & Mirrors, Rockville Centre
- Doors & Door Frames, Rockville Centre - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Drinking Establishments, Rockville Centre
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Rockville Centre
- Dry Cleaning & Laundry, Rockville Centre - Dry Cleaners
- Dryers Sales, Service & Repair, Rockville Centre - Gas & Electric
- Drywall, Insulation & Plaster Contractors, Rockville Centre - Installation & Repair Services
- Durable & Non Durable Goods & Products, Rockville Centre
- Durable Goods & Products, Rockville Centre
- Dwelling Operators Except Apartment, Rockville Centre
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