- U-Haul Truck Rental, North Charleston - U-Haul Moving
- U-Haul Trucks, North Charleston - Uhaul Truck Rental
- U.S. Postal Service, North Charleston
- Undergarments & Nightwear Manufacturers, North Charleston
- Unfurnished Apartments, North Charleston
- Uniforms, North Charleston
- Uniforms, Work Clothes & Safety Clothing, North Charleston
- United States Coast Guard, North Charleston
- Unity Church, North Charleston
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- Urologists, North Charleston - Urology Doctors, Physicians & Surgeons
- Used Book Stores, North Charleston - New & Rare Books
- Used Cars, Truck, Van & SUV Car Dealerships, North Charleston
- Used Merchandise, Resale Shops & Thrift Stores, North Charleston
- Utilities, North Charleston
- Utilities Contractors, North Charleston
- Utility Installation Contractors, North Charleston
- Utility Services - Combined, North Charleston
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