- Dams, Waterways, & Docks Contractors, Riverhead
- Dance Companies, Riverhead
- Day Camps, Riverhead
- Day Spas, Riverhead
- Decorating & Designing Services, Riverhead
- Delicatessen Restaurants, Riverhead
- Denomination, Non-Denominational, Etcetera, Riverhead
- Dentists, Riverhead
- Department Stores, Riverhead
- Dermatologists, Riverhead - Skin Doctors, Physicians & Surgeons (Dermatology)
- Designer Clothes & Accessories, Riverhead
- Designers, Riverhead
- Developmental Disabilities, Riverhead
- Developmentally Disabled Information & Services, Riverhead
- Diesel, Riverhead - Engine Fuels, Oils & Lubricants
- Diner Restaurants, Riverhead
- Direct Mail Advertising Services, Riverhead
- Direct Newspaper Sales & Delivery, Riverhead
- Direct Selling Businesses, Riverhead
- Disability And Social Security Attorneys & Lawyers, Riverhead
- Disc Jockeys, Riverhead
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- Discount Stores, Riverhead - Clothing, Grocery, Furniture, Etc
- Dishwashers Sales, Service & Repair, Riverhead
- Disney Store, Riverhead
- Diving Equipment & Supplies, Riverhead - Scuba & Snorkel Gear & Masks Shops
- Divorce & Family Law Attorneys & Lawyers, Riverhead
- Dock Construction - Build & Repair, Riverhead - Dock Builders
- Doctors, Physicians & Surgeons, Riverhead
- Dolls, Doll Houses & Accessories , Riverhead
- Donuts, Riverhead
- Door & Gate Operating Devices, Riverhead
- Doors & Door Frames, Riverhead - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Drainage Contractors, Riverhead - Install & Repair Drainage Systems
- Draperies & Curtains Manufacturers, Riverhead
- Drapery Blinds & Shades Installation & Repair, Riverhead
- Dressmaking & Sewing Schools, Riverhead
- Drinking Establishments, Riverhead
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Riverhead
- Dry Cleaning & Laundry, Riverhead - Dry Cleaners
- Dryers Sales, Service & Repair, Riverhead - Gas & Electric
- Durable & Non Durable Goods & Products, Riverhead
- Durable Goods & Products, Riverhead
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