| 9249 | Yacht basins | |
| 9241 | Yacht club, membership | |
| 9249 | Yacht clubs (i.e., operating marinas) | |
| 9241 | Yacht clubs, without marinas | |
| 9249 | Yacht rentals | |
| 5239 | Yacht sales retail | |
| 5150 | Yacht sales, wholesale | |
| 3512 | Yachts, building, not done in shipyards | |
| 3511 | Yachts, built in shipyards | |
| 0111 | Yam farming | |
| 5232 | Yard goods (textile fabric), retail | |
| 5131 | Yard goods, textile, wholesale | |
| 0200 | Yarding logs | |
| 0200 | Yarding, timber, on contract | |
| 3312 | Yardsticks, metal, manufacturing | |
| 2029 | Yardsticks, wood, manufacturing | |
| 5131 | Yarn and thread, wholesale | |
| 1711 | Yarn bleaching, dyeing and finishing | |
| 1711 | Yarn spinning mills | |
| 2926 | Yarn texturizing machinery, manufacturing | |
| 2430 | Yarn, cellulosic filament, manufacturing | |
| 2430 | Yarn, cellulosic filament, manufacturing and texturizing | |
| 1711 | Yarn, cotton, spinning | |
| 1729 | Yarn, elastic, fabric-covered, manufacturing | |
| 2610 | Yarn, fibreglass, made in glass making plants | |
| 1711 | Yarn, man-made, spun from purchased fibre | |
| 2430 | Yarn, monofilament, man-made, manufacturing | |
| 2430 | Yarn, monofilament, man-made, manufacturing and texturizing | |
| 2430 | Yarn, non-cellulosic fibres and filaments, manufacturing | |
| 2430 | Yarn, non-cellulosic fibres and filaments, manufacturing and texturizing | |
| 1711 | Yarn, throwing, twisting and winding of purchased yarn | |
| 1711 | Yarn, wool or similar animal fibre, spinning | |
| 5131 | Yarns for knitting, wholesale | |
| 2221 | Yearbooks, printing without publishing | |
| 2211 | Yearbooks, publisher | |
| 2211 | Yearbooks, publishing | |
| 2211 | Yearbooks, publishing and printing combined | |
| 1541 | Yeast raised goods, made in commercial bakeries | |
| 1549 | Yeast, manufacturing | |
| 5122 | Yeast, wholesale | |