- Racing Car Supplies, Stouffville
- Racing Including Track Operations, Stouffville
- Radiator Coolant & Solvents, Stouffville - Engine Coolant
- Radio Communications Equipment & Systems , Stouffville
- Radio Stations & Broadcasting Companies, Stouffville
- Real Estate, Stouffville - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Stouffville
- Real Estate Agent - Property Lessors, Stouffville
- Real Estate Broker, Stouffville
- Real Estate Developers, Stouffville
- Real Estate Management, Stouffville
- Real Estate Services, Stouffville
- Record Storage, Destruction & Management, Stouffville
- Recreational Equipment & Supplies Companies, Stouffville
- Recycling Scrap & Waste Materials, Stouffville - Scrap Metal, etc
- Reflexologists, Stouffville
- Refrigeration & Air Conditioning Contractors, Stouffville - Installation, Repair, Sales & Service
- Refuse Collection & Disposal Services, Stouffville
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- Refuse Systems & Garbage Disposal, Stouffville
- Rehabilitation Centers, Products & Services, Stouffville
- Rehabilitation Specialists, Stouffville
- Religious Organizations, Stouffville
- Repair Services, Stouffville
- Research & Development Labs, Stouffville - Laboratories
- Research Services, Stouffville
- Residential, Stouffville
- Residential Architect, Stouffville
- Residential Care Facilities, Stouffville
- Restaurants/Food & Dining, Stouffville
- Retirement Communities & Home, Assisted Living & Apartments, Stouffville
- Riding & Rodeo Services, Stouffville
- Riding Apparel & Equipment, Stouffville
- Rodeo & Equestrian Equipment & Supplies, Stouffville
- Roofing Consultants, Stouffville - Roofing Companies
- Roofing Contractors, Stouffville - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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