- U-Haul Truck Rental, Saint Louis - U-Haul Moving
- U-Haul Trucks, Saint Louis - Uhaul Truck Rental
- U.S. Postal Service, Saint Louis
- Ultrasound Services, Saint Louis
- Unfinished Furniture, Saint Louis
- Unfurnished Apartments, Saint Louis
- Uniforms, Saint Louis
- Uniforms Nurses & Scrubs, Saint Louis
- Uniforms, Work Clothes & Safety Clothing, Saint Louis
- Uninterruptible Power Supplies Systems, Saint Louis
- Union Church, Saint Louis
- Unitarian Universalist Churches, Saint Louis
- United Church, Saint Louis
- United Holy Church Of America, Saint Louis
- Unity Church, Saint Louis
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- Unsupported Plastic Film & Sheet Manufacturers, Saint Louis
- Upholsterers Supplies & Equipment, Saint Louis
- Upholstery Fabric Stores , Saint Louis
- Urban Regional & Rural Planners & Consultants, Saint Louis
- Urologists, Saint Louis - Urology Doctors, Physicians & Surgeons
- Used Appliances, Saint Louis
- Used Book Stores, Saint Louis - New & Rare Books
- Used Cars, Truck, Van & SUV Car Dealerships, Saint Louis
- Used Furniture Stores, Saint Louis - Used Office, Patio, Hotel, Baby & Bedroom Furniture Dealers
- Used Merchandise, Resale Shops & Thrift Stores, Saint Louis
- Utilities, Saint Louis
- Utilities Contractors, Saint Louis
- Utility & Waste Management Services, Saint Louis
- Utility Installation Contractors, Saint Louis
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