- Radiator Coolant & Solvents, Thorold - Engine Coolant
- Radio & Television Repair Shops , Thorold - TV Repair
- Radio Stations & Broadcast Companies, Thorold - Radio, Television & Publishers Representatives
- Railroad, Thorold - Commuter & Passenger Transport
- Ready Mix Concrete, Thorold - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Thorold
- Real Estate, Thorold - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Thorold
- Real Estate Agent - Property Lessors, Thorold
- Real Estate Broker, Thorold
- Real Estate Developers, Thorold
- Real Estate Management, Thorold
- Real Estate Services, Thorold
- Recreational Services, Thorold
- Recycling Scrap & Waste Materials, Thorold - Scrap Metal, etc
- Reformed Churches, Thorold
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- Refrigeration & Cooling Equipment, Parts & Supplies , Thorold - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Thorold - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Thorold - Fridge
- Religious Organizations, Thorold
- Repair Services, Thorold
- Residential, Thorold
- Residential Apartments, Thorold
- Residential Architect, Thorold
- Restaurant Equipment Repair & Service, Thorold - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurants/Food & Dining, Thorold
- Retirement Communities & Home, Assisted Living & Apartments, Thorold
- Road Construction, Thorold - Companies & Contractors
- Road Construction & Repair Contractors, Thorold
- Roadside Assistance, Road Service & Towing Service, Thorold
- Roofing Consultants, Thorold - Roofing Companies
- Roofing Contractors, Thorold - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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