- Racing Car Supplies, Windsor
- Radiator Coolant & Solvents, Windsor - Engine Coolant
- Radio & Television Repair Shops , Windsor - TV Repair
- Radio Stations & Broadcasting Companies, Windsor
- Radiologists, Windsor - Radiology Doctors, Physicians & Surgeons
- Radon Testing & Services, Windsor
- Railroad Companies, Windsor
- Real Estate, Windsor - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Windsor
- Real Estate Developers, Windsor
- Real Estate Management, Windsor
- Real Estate Rentals, Windsor
- Real Estate Services, Windsor
- Record Storage, Destruction & Management, Windsor
- Refrigeration Repair & Service, Windsor - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Windsor - Fridge
- Refuse Collection & Disposal Services, Windsor
- Refuse Systems & Garbage Disposal, Windsor
- Rehabilitation Centers, Products & Services, Windsor
- Rehabilitation Specialists, Windsor
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- Religious Organizations, Windsor
- Repair Services, Windsor
- Research & Development Bureaus, Windsor - Commercial, Economic, Sociological & Educational Research
- Research Services, Windsor
- Residential, Windsor
- Residential Apartments, Windsor
- Residential Architectural Designers, Windsor
- Residential Care Facilities, Windsor
- Residential Construction Contractors, Windsor - General Contractors
- Restaurant Equipment Cleaning, Windsor - Restaurant Cleaners
- Restaurants/Food & Dining, Windsor
- Resume Service, Windsor
- Retail Book Stores, Windsor
- Retaining Wall Contractors, Windsor - Build & Repair - Blocks, Concrete, Stones, etc
- Retirement Communities & Home, Assisted Living & Apartments, Windsor
- Robots & Robotics System, Windsor
- Roofing Consultants, Windsor - Roofing Companies
- Roofing Contractors, Windsor - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rv Parks, Windsor
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