- Racing Car Supplies, Groton
- Radiator Coolant & Solvents, Groton - Engine Coolant
- Radio & Television Repair Shops , Groton - TV Repair
- Radio Stations & Broadcasting Companies, Groton
- Radiologists, Groton - Radiology Doctors, Physicians & Surgeons
- Ready Mix Concrete, Groton - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Groton
- Real Estate, Groton - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Groton
- Real Estate Appraiser, Groton - Appraisal Services
- Real Estate Appraisers & Consulting Services, Groton
- Real Estate Management, Groton
- Real Estate Rentals, Groton
- Real Estate Services, Groton
- Records, Tapes, CDs - Used & Vintage, Groton
- Recreational Equipment Repair & Service, Groton
- Recreational Organizations, Groton
- Recreational Services, Groton
- Reducing Exercise & Weight Control Services, Groton
- Refrigerator Sales, Service & Repair, Groton - Fridge
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- Rehabilitation Centers, Products & Services, Groton
- Rehabilitation Specialists, Groton
- Religious Organizations, Groton
- Rental & Leasing Business Equipment, Groton
- Repair Services, Groton
- Research & Development Bureaus, Groton - Commercial, Economic, Sociological & Educational Research
- Research Services, Groton
- Residential, Groton
- Residential Apartments, Groton
- Residential Care Facilities, Groton
- Resorts & Hotels, Groton
- Restaurant & Lounge, Bar, Or Pub, Groton
- Restaurant Lobster, Groton
- Restaurants/Food & Dining, Groton
- Resume Service, Groton
- Retail Book Stores, Groton
- Retirement Communities & Home, Assisted Living & Apartments, Groton
- Roofing Consultants, Groton - Roofing Companies
- Roofing Contractors, Groton - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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