- Racing Car Supplies, Clinton
- Radiator Coolant & Solvents, Clinton - Engine Coolant
- Radio & Television Repair Shops , Clinton - TV Repair
- Radio Stations & Broadcasting Companies, Clinton
- Railroad Companies, Clinton
- Railroad Ties, Clinton
- Ready Mix Concrete, Clinton - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Clinton
- Real Estate, Clinton - Agent, Broker & Companies
- Real Estate Appraiser, Clinton - Appraisal Services
- Real Estate Appraisers & Consulting Services, Clinton
- Real Estate Attorneys & Lawyers, Clinton
- Real Estate Consultants, Clinton
- Real Estate Developers, Clinton
- Real Estate Services, Clinton
- Recreational Equipment & Supplies Companies, Clinton
- Recycling Drop-Off Centers, Clinton
- Recycling Scrap & Waste Materials, Clinton - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Clinton
- Refrigerated Storage & Warehouse, Clinton - Warehousing
- Refrigeration & Cooling Equipment, Parts & Supplies , Clinton - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Clinton - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Clinton - Fridge
- Refuse Collection & Disposal, Clinton
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- Refuse Systems & Garbage Disposal, Clinton
- Rehabilitation Centers, Products & Services, Clinton
- Rehabilitation Specialists, Clinton
- Rehabilitational Job Training Services, Clinton
- Relief Organizations, Clinton
- Religious Organizations, Clinton
- Rendering Companies, Clinton
- Repair Services, Clinton
- Residential, Clinton
- Residential Apartments, Clinton
- Residential Care Facilities, Clinton
- Residential Landfills, Clinton
- Restaurant & Lounge, Bar, Or Pub, Clinton
- Restaurants/Food & Dining, Clinton
- Resume Service, Clinton
- Retail Book Stores, Clinton
- Retail Recovery Services, Clinton
- Retirement Communities & Home, Assisted Living & Apartments, Clinton
- Rigging Service & Crane Hoisting, Clinton
- Road Construction, Clinton - Companies & Contractors
- Road Construction & Repair Contractors, Clinton
- Rock Shops, Clinton
- Roofing Consultants, Clinton - Roofing Companies
- Roofing Contractors, Clinton - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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