- Radio & Television Repair Shops , Rensselaer - TV Repair
- Radio Communications Equipment & Systems , Rensselaer
- Radiologists, Rensselaer - Radiology Doctors, Physicians & Surgeons
- Railroad, Rensselaer - Commuter & Passenger Transport
- Railroad Companies, Rensselaer
- Real Estate, Rensselaer - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Rensselaer
- Real Estate Appraiser, Rensselaer - Appraisal Services
- Real Estate Appraisers & Consulting Services, Rensselaer
- Real Estate Cash Buy-Outs, Rensselaer
- Real Estate Developers, Rensselaer
- Real Estate Services, Rensselaer
- Recording Studio Service - Sound & Video, Rensselaer
- Records, Tapes, CDs - Used & Vintage, Rensselaer
- Recreational Equipment Repair & Service, Rensselaer
- Recreational Services, Rensselaer
- Recycling Drop-Off Centers, Rensselaer
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- Rehabilitation Centers, Products & Services, Rensselaer
- Rehabilitation Specialists, Rensselaer
- Religious Organizations, Rensselaer
- Religious Practitioners, Rensselaer
- Repair Services, Rensselaer
- Research & Development Labs, Rensselaer - Laboratories
- Research Services, Rensselaer
- Resident Buyers, Rensselaer
- Residential, Rensselaer
- Residential Apartments, Rensselaer
- Residential Construction Contractors, Rensselaer - General Contractors
- Restaurants - Breakfast Brunch Lunch, Rensselaer
- Restaurants/Food & Dining, Rensselaer
- Retail Book Stores, Rensselaer
- Retirement Communities & Home, Assisted Living & Apartments, Rensselaer
- Ryder Truck Rental , Rensselaer - Ryder Moving
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