- Racing Including Track Operations, Port Colborne
- Radio & Television Repair Shops , Port Colborne - TV Repair
- Railroad Companies, Port Colborne
- Real Estate, Port Colborne - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Port Colborne
- Real Estate Broker, Port Colborne
- Real Estate Developers, Port Colborne
- Real Estate Services, Port Colborne
- Record Storage, Destruction & Management, Port Colborne
- Recording Studio - Equipment & Rental, Port Colborne
- Recreational Services, Port Colborne
- Recreational Vehicles & Campers Rent & Lease, Port Colborne
- Recycling Drop-Off Centers, Port Colborne
- Recycling Scrap & Waste Materials, Port Colborne - Scrap Metal, etc
- Refuse Collection & Disposal Services, Port Colborne
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- Rehabilitation Centers, Products & Services, Port Colborne
- Rehabilitation Specialists, Port Colborne
- Religious Organizations, Port Colborne
- Repair Services, Port Colborne
- Residential, Port Colborne
- Residential Apartments, Port Colborne
- Resorts & Hotels, Port Colborne
- Restaurants/Food & Dining, Port Colborne
- Retail Book Stores, Port Colborne
- Retail Recovery Services, Port Colborne
- Retirement Communities & Home, Assisted Living & Apartments, Port Colborne
- Roadside Assistance, Road Service & Towing Service, Port Colborne
- Roofing Consultants, Port Colborne - Roofing Companies
- Roofing Contractors, Port Colborne - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rvs Sales, Rental & Leasing, Port Colborne
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