- Radiator Coolant & Solvents, Princeton - Engine Coolant
- Radiator Repair, Princeton - Gas Tank Repair
- Radiator Repair & Rebuild, Princeton
- Radio & Television Repair Shops , Princeton - TV Repair
- Radio Stations & Broadcasting Companies, Princeton
- Railroad Car Repair & Maintenance, Princeton
- Railroad Companies, Princeton
- Railroad Repair & Maintenance, Princeton
- Ready Mix Concrete, Princeton - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Princeton
- Real Estate, Princeton - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Princeton
- Real Estate Appraiser, Princeton - Appraisal Services
- Real Estate Appraisers & Consulting Services, Princeton
- Real Estate Management, Princeton
- Real Estate Services, Princeton
- Recycling Drop-Off Centers, Princeton
- Refuse Collection & Disposal Services, Princeton
- Refuse Systems & Garbage Disposal, Princeton
- Rehabilitation Centers, Products & Services, Princeton
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- Rehabilitation Specialists, Princeton
- Relief Organizations, Princeton
- Religious Education, Princeton
- Religious Organizations, Princeton
- Religious Practitioners, Princeton
- Rental Property Management, Princeton
- Repair Services, Princeton
- Research & Development Labs, Princeton - Laboratories
- Research Services, Princeton
- Residential, Princeton
- Residential Apartments, Princeton
- Residential Care Facilities, Princeton
- Residential Construction Contractors, Princeton - General Contractors
- Restaurants/Food & Dining, Princeton
- Road Construction, Princeton - Companies & Contractors
- Road Construction & Repair Contractors, Princeton
- Roofing Consultants, Princeton - Roofing Companies
- Roofing Contractors, Princeton - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rubber Products - Retail, Princeton
- Ryder Truck Rental , Princeton - Ryder Moving
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