- Radiologists, Port Jefferson - Radiology Doctors, Physicians & Surgeons
- Range & Oven Repair, Service & Sales, Port Jefferson
- Real Estate, Port Jefferson - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Port Jefferson
- Real Estate Appraiser, Port Jefferson - Appraisal Services
- Real Estate Appraisers & Consulting Services, Port Jefferson
- Real Estate Attorneys & Lawyers, Port Jefferson
- Real Estate Services, Port Jefferson
- Recycling Drop-Off Centers, Port Jefferson
- Reflexologists, Port Jefferson
- Refrigerator Sales, Service & Repair, Port Jefferson - Fridge
- Rehabilitation Centers, Port Jefferson
- Rehabilitation Centers, Products & Services, Port Jefferson
- Rehabilitation Specialists, Port Jefferson
- Religious Organizations, Port Jefferson
- Repair Services, Port Jefferson
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- Research & Development Bureaus, Port Jefferson - Commercial, Economic, Sociological & Educational Research
- Research Services, Port Jefferson
- Residential, Port Jefferson
- Residential Apartments, Port Jefferson
- Residential Care Facilities, Port Jefferson
- Residential Construction Contractors, Port Jefferson - General Contractors
- Residential Landfills, Port Jefferson
- Restaurant Management & Consulting, Port Jefferson - Food Facilities Consultants
- Restaurants/Food & Dining, Port Jefferson
- Restoration Church, Port Jefferson
- Retail Book Stores, Port Jefferson
- Roofing Consultants, Port Jefferson - Roofing Companies
- Roofing Contractors, Port Jefferson - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rubber & Plastic Products, Port Jefferson
- Rubber Products - Manufacturers, Port Jefferson
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