- U-Haul Truck Rental, Seattle - U-Haul Moving
- U-Haul Trucks, Seattle - Uhaul Truck Rental
- U.S. Postal Service, Seattle
- Ultrasound Services, Seattle
- Umbrellas Retail, Seattle
- Underground Utility Locating Service, Seattle
- Underground Wire & Cable Contractors, Seattle
- Unfinished Furniture, Seattle
- Unfurnished Apartments, Seattle
- Uniforms, Seattle
- Uniforms Renting & Cleaning Service, Seattle
- Uniforms, Work Clothes & Safety Clothing, Seattle
- Union Church, Seattle
- Unitarian Universalist Churches, Seattle
- United Church, Seattle
- Unity Church, Seattle
- Universal Church, Seattle
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- Unknown, Seattle
- Upholstering Contractors, Seattle
- Upholstery Fabric Stores , Seattle
- Urban Regional & Rural Planners & Consultants, Seattle
- Urologists, Seattle - Urology Doctors, Physicians & Surgeons
- Used Appliances, Seattle
- Used Book Stores, Seattle - New & Rare Books
- Used Books & Magazines Stores, Seattle
- Used Cars, Truck, Van & SUV Car Dealerships, Seattle
- Used Furniture Stores, Seattle - Used Office, Patio, Hotel, Baby & Bedroom Furniture Dealers
- Used Merchandise, Resale Shops & Thrift Stores, Seattle
- Used Motorcycle Dealers, Seattle
- Utilities, Seattle
- Utilities Contractors, Seattle
- Utility & Waste Management Services, Seattle
- Utility Trailer Rental, Seattle
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