- Warehousing & Storage, Irmo - Warehouse Services
- Waste & Refuse Services & Sites, Irmo
- Water Companies, Irmo
- Water Consultants, Irmo
- Water Filters & Purification Systems, Equipment & Supplies, Irmo - Water Filtration Systems Companies
- Water Service, Irmo
- Water Transportation, Except Passenger, Irmo
- Wedding Supplies & Bridal Shops, Irmo
- Weight Loss & Control Programs, Irmo
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- Welding & Welder, Irmo - Welding Supplies, Machines, Equipment, Services & Contractors
- Wigs, Toupees & Hair Products Stores, Irmo
- Window & Blind Cleaning, Irmo
- Windows and Doors, Irmo - Wholesale, Manufacturers & Suppliers
- Wireless & Cellular Communications Equipment & Supplies, Irmo
- Work, Utility & Commercial Vehicle Dealers, Irmo
- Wrecking & Demolition Contractors, Irmo - House & Building Demolition Companies
- Writing Services, Irmo
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