- U-Haul Truck Rental, Oakville - U-Haul Moving
- U-Haul Trucks, Oakville - Uhaul Truck Rental
- Undergarments & Nightwear Manufacturers, Oakville
- Uniforms, Oakville
- Uniforms, Work Clothes & Safety Clothing, Oakville
- United Brethren In Christ Church, Oakville
- United Church, Oakville
- United Church Of Canada, Oakville
- Unknown, Oakville
- Urban Regional & Rural Planners & Consultants, Oakville
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- Urologists, Oakville - Urology Doctors, Physicians & Surgeons
- Used Book Stores, Oakville - New & Rare Books
- Used Cars, Truck, Van & SUV Car Dealerships, Oakville
- Used Furniture Stores, Oakville - Used Office, Patio, Hotel, Baby & Bedroom Furniture Dealers
- Used Merchandise, Resale Shops & Thrift Stores, Oakville
- Utilities, Oakville
- Utilities Contractors, Oakville
- Utility & Waste Management Services, Oakville
- Utility Installation Contractors, Oakville
- Utility Trailer Rental, Oakville
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