- Race Car Dealers, Riverhead
- Radiator Coolant & Solvents, Riverhead - Engine Coolant
- Radio & Television Repair Shops , Riverhead - TV Repair
- Radio Stations & Broadcasting Companies, Riverhead
- Radiologists, Riverhead - Radiology Doctors, Physicians & Surgeons
- Radiotelephone Communications, Riverhead
- Railroad Companies, Riverhead
- Ready Mix Concrete, Riverhead - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Riverhead
- Real Estate, Riverhead - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Riverhead
- Real Estate Agent - Property Lessors, Riverhead
- Real Estate Appraiser, Riverhead - Appraisal Services
- Real Estate Appraisers & Consulting Services, Riverhead
- Real Estate Broker, Riverhead
- Real Estate Consultants, Riverhead
- Real Estate Developers, Riverhead
- Real Estate Management, Riverhead
- Real Estate Services, Riverhead
- Record Storage, Destruction & Management, Riverhead
- Recreation Management Services, Riverhead
- Recreational Equipment & Supplies Companies, Riverhead
- Recreational Good Manufacturers, Riverhead
- Recycling Drop-Off Centers, Riverhead
- Recycling Scrap & Waste Materials, Riverhead - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Riverhead
- Refrigerator Sales, Service & Repair, Riverhead - Fridge
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- Refuse Collection & Disposal, Riverhead
- Refuse Collection & Disposal Services, Riverhead
- Refuse Systems & Garbage Disposal, Riverhead
- Rehabilitation Centers, Products & Services, Riverhead
- Rehabilitation Specialists, Riverhead
- Religious Goods & Church Supplies Stores, Riverhead
- Religious Organizations, Riverhead
- Religious Practitioners, Riverhead
- Repair Services, Riverhead
- Research & Development Labs, Riverhead - Laboratories
- Research Services, Riverhead
- Residential, Riverhead
- Residential Apartments, Riverhead
- Residential Care Facilities, Riverhead
- Residential Construction Contractors, Riverhead - General Contractors
- Restaurant Equipment Repair & Service, Riverhead - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurant Lobster, Riverhead
- Restaurant Management & Consulting, Riverhead - Food Facilities Consultants
- Restaurants/Food & Dining, Riverhead
- Retail Book Stores, Riverhead
- Retirement Communities & Home, Assisted Living & Apartments, Riverhead
- Riding Apparel & Equipment, Riverhead
- Rigging Service & Crane Hoisting, Riverhead
- Roadside Assistance, Road Service & Towing Service, Riverhead
- Roofing Consultants, Riverhead - Roofing Companies
- Roofing Contractors, Riverhead - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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