| Welding | 917 |
| Welding Equipment-Renting | 917 |
| Welding Equipment-Repairing | 917 |
| Welding Equipment & Supplies | 918 |
| Wellpoint & Dewatering Systems | 918 |
| Western Apparel | 918 |
| Wetlands-Consultants | 918 |
| Wheel Alignment, Frame & Axle- Servicing- | 918 |
| Automotive |
| Wheelchair & Invalid Transportation | 918 |
| Wheelchair Lifts & Ramps | 918 |
| Wheelchairs | 919 |
| Wheelchairs-Renting | 919 |
| Wheels | 919 |
| Whirlpool Bath Equipment Supplies, Service & | 919 |
| Repair |
| Wigs & Hairpieces | 919 |
| Window Cleaning | 919 |
| Window Shades | 919 |
| Window Treatments | 919 |
| Windows | 920 |
| Windows-Plastic | 921 |
| Windows-Repairing | 921 |
| Windows-Whsle | 921 |
| Windows-Wood | 921 |
| Windshield Repair | 921 |
| Wineries | 922 |
| Wines | 922 |
| Wines-Whsle | 922 |
| Wire & Cable-Electric | 922 |
| Wire Rope | 922 |
| Wireless Phone Services | 922 |
| Women’s Apparel | 923 |
| Women’s Apparel-Whsle & Mfrs | 924 |
| Wood Finishing Service | 924 |
| Wood Flooring | 924 |
| Wood Turning | 924 |
| Woodworking | 924 |
| Work Clothing | 924 |
| Wrecker Service | 924 |
| X |
| X-Ray Apparatus & Supplies | 924 |
| X-Ray Laboratories-Industrial | 924 |
| X-Ray Laboratories-Medical & Dental | 924 |
| Y |
| Yacht & Boat Brokers | 925 |
| Yarn | 925 |
| Yellow Pages Advertising | 925 |
| Yoga Instruction | 925 |
| Yogurt | 925 |
| Youth Organizations & Centers | 926 |
| Z |
| Zippers-Repairing | 926 |
| Zoos | 926 |