- Dance Companies, Swansea
- Day Camps, Swansea
- Day Spas, Swansea
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Swansea
- Decorating & Designing Services, Swansea
- Denomination, Non-Denominational, Etcetera, Swansea
- Dentists, Swansea
- Department Stores, Swansea
- Diabetic Equipment & Supplies, Swansea
- Diabetic Equipment Supplies & Services, Swansea
- Diamonds & Precious & Semi-Precious Stones, Swansea
- Diet Center, Swansea
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- Diet Centers, Swansea
- Dining Room Furniture Formal, Swansea
- Direct Mail Advertising Services, Swansea
- Disc Jockeys, Swansea
- Discount Stores, Swansea - Clothing, Grocery, Furniture, Etc
- Divorce & Family Law Attorneys & Lawyers, Swansea
- Doctors, Physicians & Surgeons, Swansea
- Donuts, Swansea
- Drinking Establishments, Swansea
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Swansea
- Dry Cleaning & Laundry, Swansea - Dry Cleaners
- Dump Truck, Swansea
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