- Racing Car Supplies, Columbus
- Radon Testing & Services, Columbus
- Railroad Companies, Columbus
- Ready Mix Concrete, Columbus - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Columbus
- Real Estate, Columbus - Agent, Broker & Companies
- Real Estate Appraiser, Columbus - Appraisal Services
- Real Estate Appraisers & Consulting Services, Columbus
- Real Estate Consultants, Columbus
- Real Estate Services, Columbus
- Recycling Drop-Off Centers, Columbus
- Recycling Scrap & Waste Materials, Columbus - Scrap Metal, etc
- Religious Education, Columbus
- Religious Organizations, Columbus
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- Repair Services, Columbus
- Research Services, Columbus
- Residential, Columbus
- Residential Apartments, Columbus
- Residential Care Facilities, Columbus
- Restaurants/Food & Dining, Columbus
- Retaining Wall Contractors, Columbus - Build & Repair - Blocks, Concrete, Stones, etc
- Roofing Consultants, Columbus - Roofing Companies
- Roofing Contractors, Columbus - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Columbus
- Rotogravure & Photogravure Printing, Columbus
- Rubbish Handling Equipment, Columbus - Garbage Containers
- Rv Parks, Columbus
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