- Racing Car Supplies, Loudon
- Racing Engines, Loudon
- Radio Stations & Broadcasting Companies, Loudon
- Ready Mix Concrete, Loudon - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Loudon
- Real Estate, Loudon - Agent, Broker & Companies
- Real Estate Services, Loudon
- Recreational Equipment & Supplies Companies, Loudon
- Rehabilitation Centers, Products & Services, Loudon
- Rehabilitation Specialists, Loudon
- Religious Organizations, Loudon
- Repair Services, Loudon
- Research Service Libraries, Loudon
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- Research Services, Loudon
- Residential, Loudon
- Residential Apartments, Loudon
- Residential Care Facilities, Loudon
- Residential Construction Contractors, Loudon - General Contractors
- Residential Landfills, Loudon
- Restaurants/Food & Dining, Loudon
- Retirement Communities & Home, Assisted Living & Apartments, Loudon
- Roofing Consultants, Loudon - Roofing Companies
- Roofing Contractors, Loudon - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rooming & Boarding Houses, Loudon
- Rv Parks, Loudon
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