- Dams, Waterways, & Docks Contractors, West Babylon
- Dance Companies, West Babylon
- Data Communications Service, Equipment, Supplies & Sales, West Babylon
- Day Spas, West Babylon
- Decorating & Designing Services, West Babylon
- Decorative & Stamped Concrete, West Babylon
- Delicatessen Restaurants, West Babylon
- Delivery Dry Cleaning & Laundry, West Babylon
- Dental Supplies & Equipment, West Babylon
- Dentists, West Babylon
- Department Stores, West Babylon
- Diner Restaurants, West Babylon
- Direct Mail Advertising, West Babylon
- Direct Mail Advertising Services, West Babylon
- Dirt, West Babylon
- Disc Jockey Equipment & Supplies, West Babylon
- Disc Jockeys, West Babylon
- Discount Stores, West Babylon - Clothing, Grocery, Furniture, Etc
- Disease, Handicap & Disability Services, Organizations & Groups, West Babylon
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- Dispensing Machines, West Babylon
- Display Fixtures & Materials, West Babylon
- Displays & Display Installation Service, West Babylon - Trade Show Displays
- Dock Construction - Build & Repair, West Babylon - Dock Builders
- Doctors, Physicians & Surgeons, West Babylon
- Donuts, West Babylon
- Door & Gate Operating Devices, West Babylon
- Doors & Door Frames, West Babylon - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Drinking Establishments, West Babylon
- Driveway, Parking Lot & Blacktop Contractors, West Babylon - Construction, Repair & Maintenance
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, West Babylon
- Dry Cleaning & Laundry, West Babylon - Dry Cleaners
- Drywall Contractors, West Babylon - Drywall Repair & Installation Services
- Drywall, Insulation & Plaster Contractors, West Babylon - Installation & Repair Services
- Duct & Duct Fittings, West Babylon
- Duct Work & Duct Supplies & Equipment, West Babylon
- Dumpster Rental, West Babylon
- Durable & Non Durable Goods & Products, West Babylon
- Durable Goods & Products, West Babylon
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