- Tank & Pipe Working Industrial Equipment, Welland
- Tanning Salons, Welland
- Tattooing, Welland
- Tax Return Preparation, Welland
- Tax Services, Welland
- Taxi Cab Service, Welland
- Taxi Service, Welland
- Telecommunications, Welland
- Telephone Answering Service, Welland - Messenger Services
- Telephone Jack & Wiring - Installation & Repair, Welland - Phone Jack - Wiring
- Terrazzo Tile Marble & Mosaic Contractors, Welland
- Testing Laboratories, Welland - Lab Tests
- Theater & Sport Ticket Agencies, Welland
- Theater & Theatrical Supplies & Equipment, Welland - Stage Lighting, Stage Curtains, Sets, Costumes, etc
- Thermography Equipment & Inspection Services, Welland
- Thrift Stores, Resale & Consignment Shops, Welland
- Tile Contractors - Install & Repair, Welland - Ceramic & Porcelain Tile Flooring - Kitchen & Bathroom
- Tile Supplies, Welland - Tile Stores - Companies
- Tires - Wholesale & Retail, Welland
- Title & Surety Insurance, Welland
- Tools & Hardware Supplies, Welland
- Tourist Attractions, Welland
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- Towing Service, Welland
- Toy Stores, Welland
- Trade Shows, Expositions & Fairs, Welland
- Traffic Ticket Attorneys & Lawyers, Welland - Traffic Violation
- Traffic Ticket Lawyers & Attorneys, Welland - Traffic Violation
- Traffic Violation Attorneys & Lawyers, Welland - Traffic Ticket
- Trailer Hitch, Welland - Accessories, Parts, Installation, etc
- Trailer Rental & Leasing, Welland
- Transportation, Welland
- Transportation & Traffic Consultants & Services, Welland - Transportation Brokers & Consultants
- Transportation Equipment Manufacturers, Welland
- Transportation Facilities & Services, Welland
- Transportation Rental & Leasing, Welland
- Travel & Tourism, Welland
- Travel Arrangement & Services, Welland
- Tree Consultants, Welland
- Truck Campers & Camper Shells, Welland - Truck Caps, Toppers, Bed Covers, Tonneau Covers, etc
- Truck Rental & Leasing, Welland - Rent a Truck & Tractor
- Truck Repair & Service, Welland
- Truck Wash & Cleaning Service, Welland
- Tutoring Instructor, Welland
- TV & Radio Advertising, Welland - TV Commercials, Radio Stations ads, etc
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