| 0140 | Weed control and fertilizing services (except for crops) | |
| 0140 | Weed control service, chemical, agriculture | |
| 0140 | Weed control service, crop, before planting | |
| 0140 | Weed control, crop, after planting | |
| 0140 | Weed spraying service, crops and plants (except from aircraft) | |
| 2921 | Weeding machines, farm type, manufacturing | |
| 4520 | Weeping tile installation | |
| 5131 | Weft knit fabrics, wholesale | |
| 7499 | Weighing services not connected to transportation | |
| 9309 | Weight control clinic | |
| 9309 | Weight reduction centres (non medical) | |
| 9241 | Weight training centres | |
| 1511 | Weiners, sausages, luncheon meats and other prepared meat products (except poultry), produced in a slaughtering plant | |
| 1511 | Weiners, sausages, luncheon meats and other processed meat products (except poultry and small game), made from purchased meat | |
| 0500 | Weir fishing, seafish | |
| 6304 | Welcome centres | |
| 7430 | Welcoming services (i.e., advertising services) | |
| 2899 | Welded wire fabric, iron or steel, made in wire drawing plants | |
| 1810 | Welders' aprons, leather, manufacturing | |
| 1810 | Welders' gloves, manufacturing | |
| 2520 | Welders' hoods, manufacturing | |
| 1810 | Welders' jackets, leggings and sleeves, leather, manufacturing | |
| 4520 | Welding contractors, operating at site of construction | |
| 5150 | Welding electrodes and wire, wholesale | |
| 2899 | Welding electrodes, manufacturing | |
| 5234 | Welding equipment and supplies, retail | |
| 7129 | Welding equipment, rental | |
| 2922 | Welding equipment, repair and maintenance | |
| 7422 | Welding inspection service | |
| 5150 | Welding machinery and equipment, wholesale | |
| 2922 | Welding positioners (i.e., jigs), manufacturing | |
| 2892 | Welding repair services (except construction) | |
| 2720 | Welding rod, uncoated, non-ferrous metal (except aluminum, copper), made from purchased metal or scrap | |
| 2892 | Welding shop | |
| 2899 | Welding wire or rod (i.e., coated or cored), manufacturing | |
| 4520 | Welding, rivetting or bolting purchased fabricated parts for steel erection | |
| 2811 | Weldments, manufacturing | |
| 5510 | Welfare camps (recreational) | |
| 8532 | Welfare centre | |
| 2710 | Well casing (e.g., heavy riveted, lock joint, welded, wrought), made from purchased iron or steel | |