| 0122 | Worm production | |
| 5121 | Worms, wholesale | |
| 5131 | Worsted and woolen piece goods, woven, wholesale | |
| 1711 | Worsted fabrics, broad-woven, weaving | |
| 1711 | Worsted type yarn, wool fibre, spinning | |
| 1711 | Woven carbon and aramid threads, manufacturing | C |
| 5131 | Woven cloth, piece goods, wholesale | |
| 2010 | Wrappers, excelsior, manufacturing | |
| 2919 | Wrapping (i.e., packaging) machinery, manufacturing | |
| 5149 | Wrapping paper (except giftwrap), wholesale | |
| 3699 | Wreaths, artificial, manufacturing | |
| 5020 | Wrecker service (towing), motor vehicle | |
| 5149 | Wreckers, auto, wholesale | |
| 4510 | Wrecking, buildings or other structures, contractors | |
| 2893 | Wrenches, hand tools, non-powered, manufacturing | |
| 2922 | Wrenches, impact, hand held power-driven, manufacturing | |
| 9241 | Wrestlers, independent, professional | |
| 9241 | Wrestling event promoters, without facilities | |
| 9241 | Wrestling promoters, with facilities | |
| 2930 | Wringers, domestic, manufacturing | |
| 1730 | Wristlets, made in knitting mills | |
| 9214 | Writers, independent | |
| 5139 | Writing and printing paper, cut to size or packaged, wholesale | |
| 9199 | Writing clubs | |
| 5139 | Writing ink, wholesale | |
| 2429 | Writing inks, manufacturing | |
| 2109 | Writing paper and envelopes, boxed sets, made from purchased paper | |
| 2109 | Writing paper, cut sheet, made from purchased paper | |
| 5239 | Writing paper, retail | |
| 2109 | Writing tablets, manufacturing | |
| 4540 | Wrought iron and steel decorative work, installation | |
| 3610 | Wrought iron furniture, manufacturing | |
| 2710 | Wrought iron or steel pipe and tubing, made in steel mills | |
| 1320 | Wulfenite mining | |
| 1429 | Wurtzilite mining | |