- Radiator Coolant & Solvents, Sinton - Engine Coolant
- Radiator Repair, Sinton - Gas Tank Repair
- Radiator Repair & Rebuild, Sinton
- Radiators Heating, Sinton
- Radiotelephone Communications, Sinton
- Reading Instruction Schools, Sinton
- Ready Mix Concrete, Sinton - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Sinton
- Real Estate, Sinton - Agent, Broker & Companies
- Real Estate Services, Sinton
- Recreational Services, Sinton
- Recycling Scrap & Waste Materials, Sinton - Scrap Metal, etc
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- Refrigeration Repair & Service, Sinton - Ac, Freezer, Refrigerator Repair
- Religious Organizations, Sinton
- Repair Services, Sinton
- Research Services, Sinton
- Residential, Sinton
- Residential Apartments, Sinton
- Residential Care Facilities, Sinton
- Restaurants/Food & Dining, Sinton
- Retirement Communities & Home, Assisted Living & Apartments, Sinton
- Road Construction, Sinton - Companies & Contractors
- Road Construction & Repair Contractors, Sinton
- Rv Parks, Sinton
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