- U-Haul Truck Rental, Pittsburgh - U-Haul Moving
- U-Haul Trucks, Pittsburgh - Uhaul Truck Rental
- U.S. Postal Service, Pittsburgh
- Underground Utility Locating Service, Pittsburgh
- Unfinished Furniture, Pittsburgh
- Unfurnished Apartments, Pittsburgh
- Uniforms, Pittsburgh
- Uniforms, Work Clothes & Safety Clothing, Pittsburgh
- Union Church, Pittsburgh
- Unitarian Universalist Churches, Pittsburgh
- United States Army, Pittsburgh
- Unity Church, Pittsburgh
- Universal Church, Pittsburgh
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- Unsupported Plastic Film & Sheet Manufacturers, Pittsburgh
- Upholstery Fabrics Manufacturers, Pittsburgh
- Urologists, Pittsburgh - Urology Doctors, Physicians & Surgeons
- Used Appliances, Pittsburgh
- Used Book Stores, Pittsburgh - New & Rare Books
- Used Cars, Truck, Van & SUV Car Dealerships, Pittsburgh
- Used Furniture Stores, Pittsburgh - Used Office, Patio, Hotel, Baby & Bedroom Furniture Dealers
- Used Merchandise, Resale Shops & Thrift Stores, Pittsburgh
- Utilities, Pittsburgh
- Utilities Contractors, Pittsburgh
- Utility & Waste Management Services, Pittsburgh
- Utility Installation Contractors, Pittsburgh
- Utility Services - Combined, Pittsburgh
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