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