- Radio & Television Repair Shops , Stony Brook - TV Repair
- Radiologists, Stony Brook - Radiology Doctors, Physicians & Surgeons
- Radiology Equipment & Services, Stony Brook - X-Ray Equipment & Supplies
- Radiotelephone Communications, Stony Brook
- Range & Oven Repair, Service & Sales, Stony Brook
- Real Estate, Stony Brook - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Stony Brook
- Real Estate Appraiser, Stony Brook - Appraisal Services
- Real Estate Appraisers & Consulting Services, Stony Brook
- Real Estate Services, Stony Brook
- Recording Studio - Equipment & Rental, Stony Brook
- Reformed Churches, Stony Brook
- Rehabilitation Centers, Products & Services, Stony Brook
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- Rehabilitation Specialists, Stony Brook
- Religious Education, Stony Brook
- Religious Organizations, Stony Brook
- Repair Services, Stony Brook
- Research & Development Labs, Stony Brook - Laboratories
- Research Services, Stony Brook
- Residential Construction Contractors, Stony Brook - General Contractors
- Restaurant Lobster, Stony Brook
- Restaurants/Food & Dining, Stony Brook
- Retirement Communities & Home, Assisted Living & Apartments, Stony Brook
- Roofing Consultants, Stony Brook - Roofing Companies
- Roofing Contractors, Stony Brook - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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