- Racing Including Track Operations, Marlborough
- Radio & Television Repair Shops , Marlborough - TV Repair
- Radiotelephone Communications, Marlborough
- Radon Testing & Services, Marlborough
- Real Estate, Marlborough - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Marlborough
- Real Estate Agent - Property Lessors, Marlborough
- Real Estate Apartments & Residential, Marlborough
- Real Estate Appraiser, Marlborough - Appraisal Services
- Real Estate Appraisers & Consulting Services, Marlborough
- Real Estate Broker, Marlborough
- Real Estate Consultants, Marlborough
- Real Estate Developers, Marlborough
- Real Estate Management, Marlborough
- Real Estate Properties, Marlborough
- Real Estate Services, Marlborough
- Record Storage, Destruction & Management, Marlborough
- Records, Tapes, Cd & Dvd Manufacturers, Marlborough
- Records, Tapes, CDs - Used & Vintage, Marlborough
- Recreational Equipment Repair & Service, Marlborough
- Recreational Services, Marlborough
- Recycling Drop-Off Centers, Marlborough
- Recycling Scrap & Waste Materials, Marlborough - Scrap Metal, etc
- Refrigerator Sales, Service & Repair, Marlborough - Fridge
- Rehabilitation Centers, Products & Services, Marlborough
- Rehabilitation Specialists, Marlborough
- Rehabilitational Job Training Services, Marlborough
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- Religious Education, Marlborough
- Religious Organizations, Marlborough
- Relocation Services, Marlborough
- Rental & Leasing Business Equipment, Marlborough
- Rental Property Management, Marlborough
- Repair Services, Marlborough
- Research & Development Bureaus, Marlborough - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, Marlborough - Laboratories
- Research Services, Marlborough
- Residential, Marlborough
- Residential Apartments, Marlborough
- Residential Construction Contractors, Marlborough - General Contractors
- Restaurant & Food Service Management Services, Marlborough
- Restaurant & Lounge, Bar, Or Pub, Marlborough
- Restaurant Equipment, Marlborough
- Restaurant Equipment & Supplies, Marlborough
- Restaurant Supplies & Equipment, Marlborough
- Restaurants/Food & Dining, Marlborough
- Retail Book Stores, Marlborough
- Retirement & Estate Planning, Marlborough
- Retirement Communities & Home, Assisted Living & Apartments, Marlborough
- Retirement Planning Consultants & Services, Marlborough
- Roast Beef Restaurants, Marlborough
- Robots & Robotics System, Marlborough
- Roofing Consultants, Marlborough - Roofing Companies
- Roofing Contractors, Marlborough - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rooming & Boarding Houses, Marlborough
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