- U-Haul Truck Rental, St Catharines - U-Haul Moving
- U-Haul Trucks, St Catharines - Uhaul Truck Rental
- Undergarments & Nightwear Manufacturers, St Catharines
- Underground Utility Locating Service, St Catharines
- Uniforms, Work Clothes & Safety Clothing, St Catharines
- United Church, St Catharines
- United States Coast Guard, St Catharines
- Unsupported Plastic Film & Sheet Manufacturers, St Catharines
- Upholsterers Supplies & Equipment, St Catharines
- Upholstery Fabric Stores , St Catharines
- Urban Regional & Rural Planners & Consultants, St Catharines
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- Urologists, St Catharines - Urology Doctors, Physicians & Surgeons
- Used Book Stores, St Catharines - New & Rare Books
- Used Cars, Truck, Van & SUV Car Dealerships, St Catharines
- Used Furniture Stores, St Catharines - Used Office, Patio, Hotel, Baby & Bedroom Furniture Dealers
- Used Merchandise, Resale Shops & Thrift Stores, St Catharines
- Utilities, St Catharines
- Utilities Contractors, St Catharines
- Utility & Waste Management Services, St Catharines
- Utility Installation Contractors, St Catharines
- Utility Services - Combined, St Catharines
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