- U-Haul Truck Rental, Mississauga - U-Haul Moving
- U-Haul Trucks, Mississauga - Uhaul Truck Rental
- Ultrasonic Equipment & Supplies, Mississauga
- Umbrellas Retail, Mississauga
- Undergarments & Nightwear Manufacturers, Mississauga
- Uniforms, Mississauga
- Uniforms Renting & Cleaning Service, Mississauga
- Uniforms, Work Clothes & Safety Clothing, Mississauga
- Unitarian Universalist Churches, Mississauga
- United Church, Mississauga
- Unknown, Mississauga
- Unsupported Plastic Film & Sheet Manufacturers, Mississauga
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- Upholsterers Supplies & Equipment, Mississauga
- Upholstery Fabric Stores , Mississauga
- Urban Regional & Rural Planners & Consultants, Mississauga
- Used Appliances, Mississauga
- Used Book Stores, Mississauga - New & Rare Books
- Used Cars, Truck, Van & SUV Car Dealerships, Mississauga
- Used Furniture Stores, Mississauga - Used Office, Patio, Hotel, Baby & Bedroom Furniture Dealers
- Used Merchandise, Resale Shops & Thrift Stores, Mississauga
- Utilities, Mississauga
- Utility & Waste Management Services, Mississauga
- Utility Trailer Rental, Mississauga
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