- Dairy Products - Wholesale & Retail, Melville
- Dams, Waterways, & Docks Contractors, Melville
- Data Communications Service, Equipment, Supplies & Sales, Melville
- Data Processing Services, Melville
- Day Camps, Melville
- Day Spas, Melville
- Debt Adjusters, Melville
- Decorating & Designing Services, Melville
- Delicatessen Restaurants, Melville
- Dental Bonding & Cosmetic Dentistry, Melville - Cosmetic Dentist & Tooth Bonding
- Dental Supplies & Equipment, Melville
- Dentists, Melville
- Department Stores, Melville
- Dermatologists, Melville - Skin Doctors, Physicians & Surgeons (Dermatology)
- Diabetes Services & Supplies, Melville - Educational, Referral & Support Service Centers
- Diner Restaurants, Melville
- Direct Mail Advertising Services, Melville
- Disability And Social Security Attorneys & Lawyers, Melville
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- Discount Stores, Melville - Clothing, Grocery, Furniture, Etc
- Disease, Handicap & Disability Services, Organizations & Groups, Melville
- Displays & Display Installation Service, Melville - Trade Show Displays
- Divorce & Family Law Attorneys & Lawyers, Melville
- Doctorate Degree, Melville
- Doctors, Physicians & Surgeons, Melville
- Dog Breeders, Melville
- Donuts, Melville
- Drafting Equipment, Melville
- Drafting Services, Melville
- Drinking Establishments, Melville
- Drugs & Pharmaceutical Supplies, Melville
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Melville
- Dry Cleaning & Laundry, Melville - Dry Cleaners
- Drywall Contractors, Melville - Drywall Repair & Installation Services
- Drywall, Insulation & Plaster Contractors, Melville - Installation & Repair Services
- Durable & Non Durable Goods & Products, Melville
- Durable Goods & Products, Melville
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