- Dance Companies, Northport
- Day Spas, Northport
- Decorating & Designing Services, Northport
- Delicatessen Restaurants, Northport
- Delivery & Errand Services, Northport
- Dental Bonding & Cosmetic Dentistry, Northport - Cosmetic Dentist & Tooth Bonding
- Dentists, Northport
- Department Stores, Northport
- Dialysis Clinics, Northport - Kidney Dialysis Centers
- Diner Restaurants, Northport
- Direct Mail Advertising Services, Northport
- Dirt, Northport
- Disability And Social Security Attorneys & Lawyers, Northport
- Discount Stores, Northport - Clothing, Grocery, Furniture, Etc
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- Divorce & Family Law Attorneys & Lawyers, Northport
- Dock Construction - Build & Repair, Northport - Dock Builders
- Doctors, Physicians & Surgeons, Northport
- Door & Gate Operating Devices, Northport
- Drinking Establishments, Northport
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Northport
- Dry Cleaning & Laundry, Northport - Dry Cleaners
- Dry Goods, Northport
- Drywall Contractors, Northport - Drywall Repair & Installation Services
- Drywall, Insulation & Plaster Contractors, Northport - Installation & Repair Services
- DUI Attorneys & Lawyers, Northport - DWI - Drunk Driving
- DUI Lawyers & Attorneys, Northport - DWI - Drunk Driving
- Dump Truck, Northport
- Durable & Non Durable Goods & Products, Northport
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