- Tank & Pipe Working Industrial Equipment, Port Colborne
- Tanning Salons, Port Colborne
- Tattooing, Port Colborne
- Tax Return Preparation, Port Colborne
- Tax Services, Port Colborne
- Taxi Cab Service, Port Colborne
- Taxi Service, Port Colborne
- Telecommunications, Port Colborne
- Telephone Jack & Wiring - Installation & Repair, Port Colborne - Phone Jack - Wiring
- Television Systems - Closed Circuit Telecasting, Port Colborne - CCTV
- Tennis Courts, Port Colborne
- Theatrical Producers & Services, Port Colborne
- Thrift Stores, Resale & Consignment Shops, Port Colborne
- Tile Supplies, Port Colborne - Tile Stores - Companies
- Tires - Wholesale & Retail, Port Colborne
- Title & Surety Insurance, Port Colborne
- Tool & Die Makers, Port Colborne
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- Tools & Hardware Supplies, Port Colborne
- Tourist Attractions, Port Colborne
- Tours & Guide Services, Port Colborne
- Towing Service, Port Colborne
- Toy Stores, Port Colborne
- Traffic Signs, Signals & Equipment , Port Colborne
- Transmission Repair & Service, Port Colborne
- Transportation, Port Colborne
- Transportation & Traffic Consultants & Services, Port Colborne - Transportation Brokers & Consultants
- Transportation Equipment Manufacturers, Port Colborne
- Transportation Rental & Leasing, Port Colborne
- Travel & Tourism, Port Colborne
- Travel Arrangement & Services, Port Colborne
- Truck Rental & Leasing, Port Colborne - Rent a Truck & Tractor
- Truck Repair & Service, Port Colborne
- Trucking - Garbage, Refuse, Waste, Trash, Scrap & Junk Removal, Port Colborne - Collection, Removal, Disposal, Recycling, etc
- Turbine Engine, Port Colborne
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