- Racing Including Track Operations, Clarksville
- Radio & Television Repair Shops , Clarksville - TV Repair
- Radio Communications Equipment Service & Repair, Clarksville
- Ready Mix Concrete, Clarksville - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Clarksville
- Real Estate, Clarksville - Agent, Broker & Companies
- Real Estate Appraisers & Consulting Services, Clarksville
- Real Estate Consultants, Clarksville
- Real Estate Services, Clarksville
- Records, Tapes, CDs - Used & Vintage, Clarksville
- Recycling Drop-Off Centers, Clarksville
- Recycling Scrap & Waste Materials, Clarksville - Scrap Metal, etc
- Red Wing Shoes, Clarksville
- Reducing Exercise & Weight Control Services, Clarksville
- Refiners & Smelters Metals, Clarksville
- Rehabilitation Centers, Products & Services, Clarksville
- Rehabilitation Specialists, Clarksville
- Religious Goods & Church Supplies Stores, Clarksville
- Religious Organizations, Clarksville
- Rental & Leasing Business Equipment, Clarksville
- Repair Services, Clarksville
- Research & Development Bureaus, Clarksville - Commercial, Economic, Sociological & Educational Research
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- Research Services, Clarksville
- Residential, Clarksville
- Residential Apartments, Clarksville
- Residential Care Facilities, Clarksville
- Residential Construction Contractors, Clarksville - General Contractors
- Restaurant Equipment, Clarksville
- Restaurant Equipment & Supplies, Clarksville
- Restaurant Supplies & Equipment, Clarksville
- Restaurants/Food & Dining, Clarksville
- Retail Book Stores, Clarksville
- Retirement Communities & Home, Assisted Living & Apartments, Clarksville
- Roadside Assistance, Road Service & Towing Service, Clarksville
- Roller Skating Rinks, Clarksville
- Roofing & Siding Materials, Equipments & Supplies, Clarksville - Wholesale, Manufacturers & Suppliers
- Roofing Consultants, Clarksville - Roofing Companies
- Roofing Contractors, Clarksville - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Clarksville
- Rv Parks, Clarksville
- RV Parts, Accessories & Equipment, Clarksville - ATV & Recreation Vehicles
- RV Repair & Service, Clarksville - ATV & Recreation Vehicles
- Ryder Truck Rental , Clarksville - Ryder Moving
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