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