- U-Haul Truck Rental, Duluth - U-Haul Moving
- U-Haul Trucks, Duluth - Uhaul Truck Rental
- U.S. Postal Service, Duluth
- Underground Utility Locating Service, Duluth
- Uniforms, Duluth
- Uniforms, Work Clothes & Safety Clothing, Duluth
- Union Church, Duluth
- Unitarian Universalist Churches, Duluth
- United States Coast Guard, Duluth
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- Upholstery Fabric Stores , Duluth
- Urban Regional & Rural Planners & Consultants, Duluth
- Urologists, Duluth - Urology Doctors, Physicians & Surgeons
- Used Book Stores, Duluth - New & Rare Books
- Used Cars, Truck, Van & SUV Car Dealerships, Duluth
- Used Furniture Stores, Duluth - Used Office, Patio, Hotel, Baby & Bedroom Furniture Dealers
- Used Merchandise, Resale Shops & Thrift Stores, Duluth
- Utilities, Duluth
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