- Race Car Dealers, South Windsor
- Racing Car Supplies, South Windsor
- Radio & Television Repair Shops , South Windsor - TV Repair
- Radiologists, South Windsor - Radiology Doctors, Physicians & Surgeons
- Real Estate, South Windsor - Agent, Broker & Companies
- Real Estate Developers, South Windsor
- Real Estate Management, South Windsor
- Real Estate Services, South Windsor
- Recreational Services, South Windsor
- Recycling Drop-Off Centers, South Windsor
- Recycling Scrap & Waste Materials, South Windsor - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, South Windsor
- Rehabilitation Centers, Products & Services, South Windsor
- Rehabilitation Specialists, South Windsor
- Religious Goods & Church Supplies Stores, South Windsor
- Religious Organizations, South Windsor
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- Religious Services, South Windsor
- Repair Services, South Windsor
- Repossession Services, South Windsor
- Research Services, South Windsor
- Residential Care Facilities, South Windsor
- Residential Construction Contractors, South Windsor - General Contractors
- Restaurants/Food & Dining, South Windsor
- Resume Service, South Windsor
- Retirement Communities & Home, Assisted Living & Apartments, South Windsor
- Road Construction & Repair Contractors, South Windsor
- Roofing Consultants, South Windsor - Roofing Companies
- Roofing Contractors, South Windsor - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, South Windsor
- Room Dividers, South Windsor - Room Partitions Contractors
- RV & Campers Repair & Service, South Windsor
- RV Repair, South Windsor - Recreational Vehicle
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