- Dams, Waterways, & Docks Contractors, Sayville
- Dance Companies, Sayville
- Day Spas, Sayville
- Decorating & Designing Services, Sayville
- Delicatessen Restaurants, Sayville
- Delivery & Errand Services, Sayville
- Dentists, Sayville
- Department Stores, Sayville
- Diabetes Services & Supplies, Sayville - Educational, Referral & Support Service Centers
- Diner Restaurants, Sayville
- Direct Mail Advertising Services, Sayville
- Disc Jockeys, Sayville
- Discount Stores, Sayville - Clothing, Grocery, Furniture, Etc
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- Doctors, Physicians & Surgeons, Sayville
- Donuts, Sayville
- Door & Gate Operating Devices, Sayville
- Doors & Door Frames, Sayville - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Drinking Establishments, Sayville
- Driveway, Parking Lot & Blacktop Contractors, Sayville - Construction, Repair & Maintenance
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Sayville
- Dry Cleaning & Laundry, Sayville - Dry Cleaners
- Drywall Contractors, Sayville - Drywall Repair & Installation Services
- Duct Work & Duct Supplies & Equipment, Sayville
- Durable & Non Durable Goods & Products, Sayville
- Durable Goods & Products, Sayville
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