- Racing Car Supplies, Knoxville
- Radiator Repair, Knoxville - Gas Tank Repair
- Radiator Repair & Rebuild, Knoxville
- Radio Stations & Broadcasting Companies, Knoxville
- Ready Mix Concrete, Knoxville - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Knoxville
- Real Estate, Knoxville - Agent, Broker & Companies
- Real Estate Appraiser, Knoxville - Appraisal Services
- Real Estate Appraisers & Consulting Services, Knoxville
- Real Estate Consultants, Knoxville
- Real Estate Farms & Ranches, Knoxville
- Real Estate Management, Knoxville
- Real Estate Properties, Knoxville
- Real Estate Services, Knoxville
- Recycling Drop-Off Centers, Knoxville
- Recycling Scrap & Waste Materials, Knoxville - Scrap Metal, etc
- Reformed Churches, Knoxville
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- Refrigeration & Cooling Equipment, Parts & Supplies , Knoxville - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Knoxville - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Knoxville - Fridge
- Rehabilitation Centers, Products & Services, Knoxville
- Rehabilitation Specialists, Knoxville
- Religious Organizations, Knoxville
- Repair Services, Knoxville
- Residential, Knoxville
- Residential Apartments, Knoxville
- Residential Care Facilities, Knoxville
- Restaurants/Food & Dining, Knoxville
- Retail Book Stores, Knoxville
- Retirement Communities & Home, Assisted Living & Apartments, Knoxville
- Roofing Consultants, Knoxville - Roofing Companies
- Roofing Contractors, Knoxville - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rv Parks, Knoxville
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