- Radiologists, Clarksville - Radiology Doctors, Physicians & Surgeons
- Real Estate, Clarksville - Agent, Broker & Companies
- Real Estate Developers, Clarksville
- Real Estate Rentals, Clarksville
- Real Estate Services, Clarksville
- Recycling Scrap & Waste Materials, Clarksville - Scrap Metal, etc
- Religious Education, Clarksville
- Religious Organizations, Clarksville
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- Repair Services, Clarksville
- Research & Development Bureaus, Clarksville - Commercial, Economic, Sociological & Educational Research
- Research Services, Clarksville
- Residential Construction Contractors, Clarksville - General Contractors
- Restaurants/Food & Dining, Clarksville
- Retirement & Estate Planning, Clarksville
- Retirement Planning Consultants & Services, Clarksville
- Riding & Rodeo Services, Clarksville
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