- Racing Car Supplies, Sidney
- Radiator Coolant & Solvents, Sidney - Engine Coolant
- Radio Stations & Broadcasting Companies, Sidney
- Railroad, Sidney - Commuter & Passenger Transport
- Railroad & Subway Construction Contractors, Sidney
- Railroad Car Repair & Maintenance, Sidney
- Railroad Contractors, Sidney
- Railroad Equipment & Supplies Manufacturers, Sidney
- Railroad Repair & Maintenance, Sidney
- Ready Mix Concrete, Sidney - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Sidney
- Real Estate, Sidney - Agent, Broker & Companies
- Real Estate Appraiser, Sidney - Appraisal Services
- Real Estate Appraisers & Consulting Services, Sidney
- Real Estate Consultants, Sidney
- Real Estate Developers, Sidney
- Real Estate Farms & Ranches, Sidney
- Real Estate Properties, Sidney
- Real Estate Services, Sidney
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- Records, Tapes, CDs - Used & Vintage, Sidney
- Recycling & Sanitation Consultants, Sidney
- Recycling Drop-Off Centers, Sidney
- Recycling Scrap & Waste Materials, Sidney - Scrap Metal, etc
- Rehabilitation Centers, Products & Services, Sidney
- Rehabilitation Specialists, Sidney
- Rehabilitational Job Training Services, Sidney
- Religious Organizations, Sidney
- Repair Services, Sidney
- Residential, Sidney
- Residential Apartments, Sidney
- Residential Care Facilities, Sidney
- Residential Construction Contractors, Sidney - General Contractors
- Restaurants/Food & Dining, Sidney
- Rigging Service & Crane Hoisting, Sidney
- Roofing Consultants, Sidney - Roofing Companies
- Roofing Contractors, Sidney - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- RV & Campers Repair & Service, Sidney
- RV Repair, Sidney - Recreational Vehicle
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