- Dams, Waterways, & Docks Contractors, Seaford
- Dance Companies, Seaford
- Day Spas, Seaford
- Delicatessen Grocers, Seaford
- Delicatessen Restaurants, Seaford
- Deliverance Church, Seaford
- Denomination, Non-Denominational, Etcetera, Seaford
- Dentists, Seaford
- Department Stores, Seaford
- Developmental Children Services, Seaford
- Developmental Disabilities, Seaford
- Diesel, Seaford - Engine Fuels, Oils & Lubricants
- Digital Imaging Photographers, Seaford
- Diner Restaurants, Seaford
- Direct Mail Advertising, Seaford
- Direct Mail Advertising Services, Seaford
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- Disabled Persons Assistive Services, Seaford
- Disc Jockeys, Seaford
- Discount Stores, Seaford - Clothing, Grocery, Furniture, Etc
- Display Fixtures & Materials, Seaford
- Displays & Display Installation Service, Seaford - Trade Show Displays
- Divorce & Family Law Attorneys & Lawyers, Seaford
- Doctors, Physicians & Surgeons, Seaford
- Donuts, Seaford
- Drinking Establishments, Seaford
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Seaford
- Dry Cleaning & Laundry, Seaford - Dry Cleaners
- Dry Goods, Seaford
- Dry Goods, Seaford
- Drywall, Insulation & Plaster Contractors, Seaford - Installation & Repair Services
- Durable & Non Durable Goods & Products, Seaford
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