- Dance Companies, Copiague
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Copiague
- Decorating & Designing Services, Copiague
- Delicatessen Restaurants, Copiague
- Dentists, Copiague
- Department Stores, Copiague
- Designers, Copiague
- Die Cutting Machine, Supplies & Equipment, Copiague
- Dies, Copiague
- Direct Selling Businesses, Copiague
- Displays & Display Installation Service, Copiague - Trade Show Displays
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- Doctors, Physicians & Surgeons, Copiague
- Dominican Restaurants, Copiague
- Donuts, Copiague
- Door & Gate Operating Devices, Copiague
- Door Installation & Repair, Copiague - Garage, Glass, Screen, Sliding, French, Closet, Front, Storm, Interior & Exterior Doors
- Doors & Door Frames, Copiague - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Drinking Establishments, Copiague
- Drugs & Pharmaceutical Supplies, Copiague
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Copiague
- Dry Cleaning & Laundry, Copiague - Dry Cleaners
- Drywall, Insulation & Plaster Contractors, Copiague - Installation & Repair Services
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