- Racing Including Track Operations, Plainville
- 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 Agent - Property Lessors, Plainville
- Real Estate Developers, Plainville
- Real Estate Investment Trusts, Plainville
- Real Estate Management, Plainville
- Real Estate Rentals, Plainville
- Real Estate Services, Plainville
- Recreational Services, Plainville
- Recycling Drop-Off Centers, Plainville
- Recycling Scrap & Waste Materials, Plainville - Scrap Metal, etc
- Refrigeration & Air Conditioning Contractors, Plainville - Installation, Repair, Sales & Service
- Refrigeration & Cooling Equipment, Parts & Supplies , Plainville - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Plainville - Ac, Freezer, Refrigerator Repair
- Rehabilitation Centers, Products & Services, Plainville
- Rehabilitation Specialists, Plainville
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- Religious Goods & Church Supplies Stores, Plainville
- Religious Organizations, Plainville
- Repair Services, Plainville
- Reprographic Services, Plainville
- Research Services, Plainville
- Residential, Plainville
- Residential Apartments, Plainville
- Residential Care Facilities, Plainville
- Residential Construction Contractors, Plainville - General Contractors
- Restaurant & Lounge, Bar, Or Pub, Plainville
- Restaurant Equipment Cleaning, Plainville - Restaurant Cleaners
- Restaurants/Food & Dining, Plainville
- Retaining Wall Contractors, Plainville - Build & Repair - Blocks, Concrete, Stones, etc
- Retirement Communities & Home, Assisted Living & Apartments, Plainville
- Riding Equipment, Plainville
- Rigging Equipment & Supplies, Plainville
- Rodeo & Equestrian Equipment & Supplies, Plainville
- Roofing Consultants, Plainville - Roofing Companies
- Roofing Contractors, Plainville - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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