- Radio & Television Repair Shops , Knox - TV Repair
- Radio Stations & Broadcasting Companies, Knox
- Railroad Companies, Knox
- Ready Mix Concrete, Knox - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Knox
- Real Estate, Knox - Agent, Broker & Companies
- Real Estate Developers, Knox
- Real Estate Services, Knox
- Recycling Drop-Off Centers, Knox
- Refrigeration & Cooling Equipment, Parts & Supplies , Knox - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Knox - Ac, Freezer, Refrigerator Repair
- Rehabilitation Centers, Products & Services, Knox
- Rehabilitation Specialists, Knox
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- Religious Organizations, Knox
- Repair Services, Knox
- Research & Development Bureaus, Knox - Commercial, Economic, Sociological & Educational Research
- Research Services, Knox
- Residential, Knox
- Residential Apartments, Knox
- Residential Care Facilities, Knox
- Resorts & Hotels, Knox
- Restaurants/Food & Dining, Knox
- Roofing Consultants, Knox - Roofing Companies
- Roofing Contractors, Knox - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Ryder Truck Rental , Knox - Ryder Moving
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