- Race Car Dealers, Port Jefferson Station
- Radiator Coolant & Solvents, Port Jefferson Station - Engine Coolant
- Radio & Television Repair Shops , Port Jefferson Station - TV Repair
- Radiologists, Port Jefferson Station - Radiology Doctors, Physicians & Surgeons
- Railroad, Port Jefferson Station - Commuter & Passenger Transport
- Real Estate, Port Jefferson Station - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Port Jefferson Station
- Real Estate Broker, Port Jefferson Station
- Real Estate Developers, Port Jefferson Station
- Real Estate Management, Port Jefferson Station
- Real Estate Services, Port Jefferson Station
- Recreational Organizations, Port Jefferson Station
- Recycling Drop-Off Centers, Port Jefferson Station
- Refrigerator Sales, Service & Repair, Port Jefferson Station - Fridge
- Rehabilitation Centers, Products & Services, Port Jefferson Station
- Rehabilitation Specialists, Port Jefferson Station
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- Religious Education, Port Jefferson Station
- Religious Organizations, Port Jefferson Station
- Rental & Leasing Business Equipment, Port Jefferson Station
- Repair Services, Port Jefferson Station
- Research Services, Port Jefferson Station
- Residential, Port Jefferson Station
- Residential Apartments, Port Jefferson Station
- Residential Care Facilities, Port Jefferson Station
- Residential Construction Contractors, Port Jefferson Station - General Contractors
- Restaurants/Food & Dining, Port Jefferson Station
- Restoration Contractors, Port Jefferson Station
- Roof Cleaning & Maintenance, Port Jefferson Station - Roofing Services
- Roofing Consultants, Port Jefferson Station - Roofing Companies
- Roofing Contractors, Port Jefferson Station - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Port Jefferson Station
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