- Radio & Tv Communications Equipment Manufacturers, 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 Agent - Property Lessors, Columbus
- Real Estate Developers, Columbus
- Real Estate Farms & Ranches, Columbus
- Real Estate Loans & Contracts, Columbus
- Real Estate Management, Columbus
- Real Estate Properties, Columbus
- Real Estate Services, Columbus
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- Recreational Equipment Repair & Service, Columbus
- Recreational Services, Columbus
- Religious Organizations, Columbus
- Repair Services, Columbus
- Residential Care Facilities, Columbus
- Residential Construction Contractors, Columbus - General Contractors
- Resorts & Hotels, Columbus
- Restaurants/Food & Dining, Columbus
- Retirement Communities & Home, Assisted Living & Apartments, Columbus
- Riding & Rodeo Services, Columbus
- Roofing Materials & Supplies, Columbus
- Rv Parks, Columbus
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