| 3841 | Yacht building and repairing | |
| 9490 | Yacht club | |
| 6100 | Yard, junk | |
| 6100 | Yard, lumber, wholesale | |
| 3211 | Yarn bleaching | |
| 3211 | Yarn dyeing | |
| 3211 | Yarn engraving | |
| 3211 | Yarn finishing | |
| 3211 | Yarn gassing | |
| 3211 | Yarn mercerizing | |
| 3211 | Yarn mill | |
| 3211 | Yarn of glass fibre manufacturing | |
| 3211 | Yarn of textile fibres spun with or covered with metal, manufacturing | |
| 3211 | Yarn printing | |
| 3211 | Yarn throwing mill | |
| 3211 | Yarn, except asbestos, manufacturing | |
| 6320 | Year round hotel | |
| 3121 | Yeast manufacturing | |
| 9399 | Young men's christian association | |
| 6320 | Young men's christian association hotel | |
| 9399 | Young men's hebrew association | |
| 9399 | Young women's christian association | |
| 6320 | Young women's christian association hotel | |
| 9399 | Young women's hebrew association | |