- Racing Including Track Operations, Plainville
- Radiator Coolant & Solvents, Plainville - Engine Coolant
- Radio & Television Repair Shops , Plainville - TV Repair
- Ready Mix Concrete, Plainville - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Plainville
- Real Estate, Plainville - Agent, Broker & Companies
- Real Estate & Insurance Schools, Plainville
- Real Estate Developers, Plainville
- Real Estate Management, Plainville
- Real Estate Services, Plainville
- Recycling Drop-Off Centers, Plainville
- Reducing Exercise & Weight Control Services, Plainville
- Rehabilitation Centers, Products & Services, Plainville
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- Rehabilitation Specialists, Plainville
- Religious Goods & Church Supplies Stores, Plainville
- Religious Organizations, Plainville
- Repair Services, Plainville
- Research Services, Plainville
- Residential, Plainville
- Residential Apartments, Plainville
- Restaurants - Breakfast Brunch Lunch, Plainville
- Restaurants/Food & Dining, Plainville
- Retirement Communities & Home, Assisted Living & Apartments, Plainville
- Riding & Rodeo Services, Plainville
- RV & Campers Repair & Service, Plainville
- RV Repair, Plainville - Recreational Vehicle
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