- Radiator Coolant & Solvents, Alliston - Engine Coolant
- Radiator Repair, Alliston - Gas Tank Repair
- Radio & Television Repair Shops , Alliston - TV Repair
- Railroad Services, Alliston
- Ready Mix Concrete, Alliston - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Alliston
- Real Estate, Alliston - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Alliston
- Real Estate Agent - Property Lessors, Alliston
- Real Estate Appraisers & Consulting Services, Alliston
- Real Estate Broker, Alliston
- Real Estate Consultants, Alliston
- Real Estate Developers, Alliston
- Real Estate Services, Alliston
- Recreation Management Services, Alliston
- Recreational Equipment & Supplies Companies, Alliston
- Recycling Scrap & Waste Materials, Alliston - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Alliston
- Refrigeration & Air Conditioning Contractors, Alliston - Installation, Repair, Sales & Service
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- Refrigerator Sales, Service & Repair, Alliston - Fridge
- Rehabilitation Centers, Products & Services, Alliston
- Rehabilitation Specialists, Alliston
- Religious Organizations, Alliston
- Repair Services, Alliston
- Residential, Alliston
- Residential Apartments, Alliston
- Residential Care Facilities, Alliston
- Residential Construction Contractors, Alliston - General Contractors
- Resorts & Hotels, Alliston
- Restaurants/Food & Dining, Alliston
- Resume Service, Alliston
- Retirement Communities & Home, Assisted Living & Apartments, Alliston
- Riding Apparel & Equipment, Alliston
- Roadside Assistance, Road Service & Towing Service, Alliston
- Rodeo & Equestrian Equipment & Supplies, Alliston
- Roofing Consultants, Alliston - Roofing Companies
- Roofing Contractors, Alliston - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Ryder Truck Rental , Alliston - Ryder Moving
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