- U-Haul Truck Rental, Chicago - U-Haul Moving
- U-Haul Trucks, Chicago - Uhaul Truck Rental
- U.S. Postal Service, Chicago
- Ultrasound Services, Chicago
- Underground Construction, Chicago
- Underground Utility Locating Service, Chicago
- Undertaker & Services, Chicago
- Unfinished Furniture, Chicago
- Unfurnished Apartments, Chicago
- Uniforms, Chicago
- Uniforms Renting & Cleaning Service, Chicago
- Uniforms, Work Clothes & Safety Clothing, Chicago
- Union Church, Chicago
- Unitarian Universalist Churches, Chicago
- United Brethren In Christ Church, Chicago
- United Church, Chicago
- United States Army, Chicago
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- Unity Church, Chicago
- Universal Church, Chicago
- Unknown, Chicago
- Unsupported Plastic Film & Sheet Manufacturers, Chicago
- Upholsterers Supplies & Equipment, Chicago
- Upholstery Fabric Stores , Chicago
- Upholstery Fabrics Manufacturers, Chicago
- Urologists, Chicago - Urology Doctors, Physicians & Surgeons
- Used Appliances, Chicago
- Used Book Stores, Chicago - New & Rare Books
- Used Cars, Truck, Van & SUV Car Dealerships, Chicago
- Used Merchandise, Resale Shops & Thrift Stores, Chicago
- Utilities, Chicago
- Utilities Contractors, Chicago
- Utility & Waste Management Services, Chicago
- Utility Installation Contractors, Chicago
- Utility Trailer Rental, Chicago
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