- Radio Stations & Broadcasting Companies, Columbia
- Radiologists, Columbia - Radiology Doctors, Physicians & Surgeons
- Railroad & Subway Construction Contractors, Columbia
- Railroad Companies, Columbia
- Railroad Contractors, Columbia
- Real Estate, Columbia - Agent, Broker & Companies
- Real Estate Management, Columbia
- Real Estate Rentals, Columbia
- Real Estate Services, Columbia
- Recording Studio Service - Sound & Video, Columbia
- Recreational Services, Columbia
- Recycling Drop-Off Centers, Columbia
- Recycling Scrap & Waste Materials, Columbia - Scrap Metal, etc
- Rehabilitation Centers, Columbia
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- Rehabilitation Centers, Products & Services, Columbia
- Rehabilitation Specialists, Columbia
- Religious Education, Columbia
- Religious Organizations, Columbia
- Repair Services, Columbia
- Research Services, Columbia
- Residential, Columbia
- Residential Apartments, Columbia
- Residential Care Facilities, Columbia
- Residential Construction Contractors, Columbia - General Contractors
- Restaurant & Lounge, Bar, Or Pub, Columbia
- Restaurants/Food & Dining, Columbia
- Retirement Communities & Home, Assisted Living & Apartments, Columbia
- Riding & Rodeo Services, Columbia
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