- Radio Stations & Broadcasting Companies, Columbia
- Railroad Companies, Columbia
- Ready Mix Concrete, Columbia - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Columbia
- Real Estate, Columbia - Agent, Broker & Companies
- Real Estate Appraiser, Columbia - Appraisal Services
- Real Estate Appraisers & Consulting Services, Columbia
- Real Estate Services, Columbia
- Rehabilitation Centers, Products & Services, Columbia
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