- Radiator Coolant & Solvents, Jefferson - Engine Coolant
- Radiator Repair, Jefferson - Gas Tank Repair
- Radiator Repair & Rebuild, Jefferson
- Radio & Television Repair Shops , Jefferson - TV Repair
- Radio Stations & Broadcasting Companies, Jefferson
- Radiotelephone Communications, Jefferson
- Radon Testing & Services, Jefferson
- Ready Mix Concrete, Jefferson - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Jefferson
- Real Estate, Jefferson - Agent, Broker & Companies
- Real Estate Appraiser, Jefferson - Appraisal Services
- Real Estate Appraisers & Consulting Services, Jefferson
- Real Estate Services, Jefferson
- Recycling Drop-Off Centers, Jefferson
- Recycling Scrap & Waste Materials, Jefferson - Scrap Metal, etc
- Refrigeration & Air Conditioning Contractors, Jefferson - Installation, Repair, Sales & Service
- Refrigeration & Cooling Equipment, Parts & Supplies , Jefferson - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Rehabilitation Centers, Products & Services, Jefferson
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- Rehabilitation Specialists, Jefferson
- Religious Organizations, Jefferson
- Religious Practitioners, Jefferson
- Repair Services, Jefferson
- Research & Development Bureaus, Jefferson - Commercial, Economic, Sociological & Educational Research
- Research Services, Jefferson
- Residential, Jefferson
- Residential Apartments, Jefferson
- Residential Care Facilities, Jefferson
- Residential Construction Contractors, Jefferson - General Contractors
- Restaurants/Food & Dining, Jefferson
- Retirement Communities & Home, Assisted Living & Apartments, Jefferson
- Riding & Rodeo Services, Jefferson
- Roofing Consultants, Jefferson - Roofing Companies
- Roofing Contractors, Jefferson - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- RV & Campers Repair & Service, Jefferson
- Rv Parks, Jefferson
- RV Repair, Jefferson - Recreational Vehicle
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