- Taxidermists, Niagara - Taxidermy
- Telecommunications, Niagara
- Telephone Communication Service & Phone Companies, Niagara - Local & Long Distance Telephone Service
- Telephone Directory Publishers, Niagara - Publishers - Directory & Guide
- Telephone Equipment & Phone Systems, Niagara - Sales, Service & Repair
- Thrift Stores, Resale & Consignment Shops, Niagara
- Tool & Die Makers, Niagara
- Tools & Hardware Supplies, Niagara
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- Towing Service, Niagara
- Trailer Parks & Campsites, Niagara
- Transportation, Niagara
- Transportation Facilities & Services, Niagara
- Travel & Tourism, Niagara
- Truck Campers & Camper Shells, Niagara - Truck Caps, Toppers, Bed Covers, Tonneau Covers, etc
- Truck Rental & Leasing, Niagara - Rent a Truck & Tractor
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