- Dairy Products - Wholesale & Retail, Port Jefferson
- Dance Companies, Port Jefferson
- Day Spas, Port Jefferson
- Decorating & Designing Services, Port Jefferson
- Delicatessen Restaurants, Port Jefferson
- Dental Bonding & Cosmetic Dentistry, Port Jefferson - Cosmetic Dentist & Tooth Bonding
- Dental Hygienists, Port Jefferson
- Dentists, Port Jefferson
- Department Stores, Port Jefferson
- Developmental Children Services, Port Jefferson
- Disciples Of Christ Church, Port Jefferson
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- Divorce & Family Law Attorneys & Lawyers, Port Jefferson
- Doctorate Degree, Port Jefferson
- Doctors, Physicians & Surgeons, Port Jefferson
- Dolls, Doll Houses & Accessories , Port Jefferson
- Donuts, Port Jefferson
- Drinking Establishments, Port Jefferson
- Driveway, Parking Lot & Blacktop Contractors, Port Jefferson - Construction, Repair & Maintenance
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Port Jefferson
- Dry Cleaning & Laundry, Port Jefferson - Dry Cleaners
- Dry Well Contractors, Port Jefferson
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