- U-Haul Truck Rental, Toronto - U-Haul Moving
- U-Haul Trucks, Toronto - Uhaul Truck Rental
- U.S. Postal Service, Toronto
- Ultrasonic Equipment & Supplies, Toronto
- Ultrasound Services, Toronto
- Umbrellas Retail, Toronto
- Undergarments & Nightwear Manufacturers, Toronto
- Underground Utility Locating Service, Toronto
- Unfinished Furniture, Toronto
- Uniforms, Toronto
- Uniforms Renting & Cleaning Service, Toronto
- Uniforms, Work Clothes & Safety Clothing, Toronto
- Union Church, Toronto
- Unitarian Universalist Churches, Toronto
- United Brethren In Christ Church, Toronto
- United Church, Toronto
- United Church Of Canada, Toronto
- United States Coast Guard, Toronto
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- Unity Church, Toronto
- Universal Church, Toronto
- Unknown, Toronto
- Unsupported Plastic Film & Sheet Manufacturers, Toronto
- Upholsterers Supplies & Equipment, Toronto
- Upholstery Fabric Stores , Toronto
- Urban Regional & Rural Planners & Consultants, Toronto
- Urologists, Toronto - Urology Doctors, Physicians & Surgeons
- Used Appliances, Toronto
- Used Book Stores, Toronto - New & Rare Books
- Used Cars, Truck, Van & SUV Car Dealerships, Toronto
- Used Furniture Stores, Toronto - Used Office, Patio, Hotel, Baby & Bedroom Furniture Dealers
- Used Merchandise, Resale Shops & Thrift Stores, Toronto
- Utilities, Toronto
- Utilities Contractors, Toronto
- Utility & Waste Management Services, Toronto
- Utility Installation Contractors, Toronto
- Utility Trailer Rental, Toronto
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