| W |
| Wake-Up Call Service | 906 |
| Wallpaper Hangers & Removers | 906 |
| Wallpapers & Wallcoverings | 906 |
| Warehouses-Cold Storage | 906 |
| Warehouses-Commodity & Merchandise | 906 |
| Warehouses-Mini | 907 |
| Warehouses-Self Service | 907 |
| Warehousing-Field | 907 |
| Warranty Programs-Extended & Supplemental | 907 |
| Washaterias | 907 |
| Washing Machines & Dryers | 907 |
| Washing Machines & Dryers-Coin Metered | 907 |
| Washing Machines & Dryers-Renting & Leasing | 907 |
| Washing Machines & Dryers-Service & Repair | 908 |
| Washing Machines & Dryers-Supplies & Parts | 908 |
| Waste Containers | 908 |
| Waste Reduction, Disposal & Recycling | 908 |
| Equipment-Industrial |
| Waste Reduction, Disposal & Recycling Service- | 908 |
| Industrial |
| Waste Removal-Medical | 908 |
| Watches-Dealers | 908 |
| Watches-Service & Repair | 908 |
| Water Blasting | 908 |
| Water Companies-Bottled, Bulk, Etc | 909 |
| Water Companies-Utility | 909 |
| Water Conservation | 909 |
| Water Consultants | 909 |
| Water Coolers | 909 |
| Water Coolers-Equipment & Supplies | 909 |
| Water Damage Restoration | 910 |
| Water Filters & Purifiers | 910 |
| Water Gardens | 910 |
| Water Heaters-Dealers | 910 |
| Water Heaters-Parts & Supplies | 910 |
| Water-Distilled | 910 |
| Water Heaters-Repairing | 911 |
| Water Pollution Control | 911 |
| Water Skiing Equipment & Supplies | 911 |
| Water Skiing Instruction | 911 |
| Water Softening & Conditioning Equipment, | 911 |
| Service & Supplies |
| Water Treatment Equipment, Service & Supplies | 911 |
| Water Treatment Equipment-Service & Supplies- | 911 |
| Whsle & Mfrs |
| Water Treatment, Purification & Filtration | 911 |
| Equipment, Service & Supplies |
| Water Well Drilling & Service | 911 |
| Water Works Equipment & Supplies | 911 |
| Waterbeds-Dealers | 911 |
| Watercraft-Personal-Dealers | 911 |
| Waterfalls | 911 |
| Waterproofing Contractors | 911 |
| Waterproofing Materials | 912 |
| Weather Forecast Service | 912 |
| Weaving & Mending Service | 912 |
| Web Site Design | 912 |
| Web Site Hosting | 912 |
| Wedding Chapels & Facilities | 912 |
| Wedding Consultants | 912 |
| Wedding Receptions | 913 |
| Wedding Supplies & Services | 914 |
| Weed Control Service | 915 |
| Weight Control Services | 916 |
| Welcoming Service For Newcomers | 917 |