| 3420 | Label lithographing | |
| 3825 | Label moistener, office, manufacturing | |
| 3824 | Labelling machine manufacturing | |
| 9100 | Labor department, governmental | |
| 3851 | Laboratory centrifuge manufacturing | |
| 3812 | Laboratory furniture, except medical and dental equipment, primarily of metal, manufacturing | |
| 3320 | Laboratory furniture, except medical and dental equipment, wooden, manufacturing | |
| 3620 | Laboratory glassware manufacturing | |
| 3851 | Laboratory instrument, excluding electric, manufacturing | |
| 3320 | Laboratory table, except primarily of metal, manufacturing | |
| 9350 | Labour organization | |
| 9350 | Labour union | |
| 3824 | Lace and net machine manufacturing | |
| 3212 | Lace bedspread cutting and sewing | |
| 3211 | Lace bedspread weaving | |
| 3212 | Lace curtain cutting and sewing | |
| 3211 | Lace curtain weaving | |
| 8329 | Lace designing service | |
| 3212 | Lace galloon cutting and sewing | |
| 3212 | Lace goods cutting and sewing | |
| 3211 | Lace goods weaving | |
| 3212 | Lace table cover cutting and sewing | |
| 3211 | Lace table cover weaving | |
| 3211 | Lace, boot and shoe, not leather, manufacturing | |
| 3233 | Lace, leather, manufacturing | |
| 3211 | Lace-machine product weaving | |
| 3212 | Lacing, made by embroidery, manufacturing | |
| 3521 | Lacquer base and dope manufacturing | |
| 3521 | Lacquer manufacturing | |
| 3511 | Lactate manufacturing | |
| 3511 | Lactic acid manufacturing | |
| 3851 | Lactometer manufacturing | |
| 3112 | Lactose manufacturing | |
| 3319 | Ladder and parts, wooden, manufacturing | |
| 3813 | Ladder, steel, manufacturing | |
| 3691 | Ladle brick manufacturing | |
| 3111 | Lamb packing | |
| 3232 | Lamb skin pulling | |
| 3419 | Laminated cardboard manufacturing | |
| 3699 | Laminated mica manufacturing | |