- Dance Companies, Wantagh
- Data Processing Services, Wantagh
- Day Spas, Wantagh
- Deck Cleaning & Restoration, Wantagh - Clean & Seal Decks, Patios, Fences, etc
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Wantagh
- Decorating & Designing Services, Wantagh
- Delicatessen Restaurants, Wantagh
- Dentists, Wantagh
- Developmental Disabilities, Wantagh
- Developmentally Disabled Information & Services, Wantagh
- Dieticians & Diet Counseling, Wantagh
- Diner Restaurants, Wantagh
- Direct Mail Advertising Services, Wantagh
- Disabled Persons Assistive Services, Wantagh
- Disc Jockeys, Wantagh
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- Discount Stores, Wantagh - Clothing, Grocery, Furniture, Etc
- Disease, Handicap & Disability Services, Organizations & Groups, Wantagh
- Diving Instruction, Wantagh
- Doctorate Degree, Wantagh
- Doctors, Physicians & Surgeons, Wantagh
- Doll Houses, Wantagh
- Dolls, Doll Houses & Accessories , Wantagh
- Donuts, Wantagh
- Door & Gate Operating Devices, Wantagh
- Door Installation & Repair, Wantagh - Garage, Glass, Screen, Sliding, French, Closet, Front, Storm, Interior & Exterior Doors
- Doors & Door Frames, Wantagh - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Drafting Services, Wantagh
- Drinking Establishments, Wantagh
- Driveway Contractors - Build, Repair, Sealing, Wantagh - Driveway Pavers - Concrete, Asphalt, Gravel Paving, etc
- Dry Cleaning & Laundry, Wantagh - Dry Cleaners
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