| 3233 | Harness collar manufacturing | |
| 3811 | Harness hardware manufacturing | |
| 3231 | Harness leather manufacturing | |
| 9511 | Harness repairing | |
| 3902 | Harp manufacturing | |
| 3822 | Harrowing machine manufacturing | |
| 3822 | Harvesting machinery manufacturing | |
| 3212 | Hassock manufacturing | |
| 3211 | Hat band manufacturing in narrow fabric textile mill | |
| 9520 | Hat blocking | |
| 3220 | Hat body making | |
| 3233 | Hat box, except paper, manufacturing | |
| 3412 | Hat box, paper, manufacturing | |
| 9520 | Hat cleaning | |
| 3220 | Hat cover, except rubber, manufacturing | |
| 3559 | Hat cover, rubber, manufacturing | |
| 3220 | Hat cutting and sewing | |
| 3909 | Hat display form manufacturing | |
| 3220 | Hat finding manufacturing | |
| 3220 | Hat frame cutting and sewing | |
| 3213 | Hat knitting | |
| 3220 | Hat lining cutting and sewing | |
| 3824 | Hat making machinery manufacturing | |
| 3320 | Hat rack manufacturing | |
| 3212 | Hat trimming cutting and sewing | |
| 3220 | Hat, fur, manufacturing | |
| 3909 | Hat, paper novelty, manufacturing | |
| 1120 | Hatchery, chicken | |
| 3811 | Hay knife manufacturing | |
| 3822 | Hay loader manufacturing | |
| 3822 | Hay mower manufacturing | |
| 3822 | Hay press manufacturing | |
| 3822 | Hay stacker manufacturing | |
| 3822 | Hay tedder manufacturing | |
| 3849 | Hay wagon manufacturing | |
| 3699 | Haydite grinding and treating, not at mine, pit or quarry | |
| 3699 | Haydite product manufacturing | |
| 3822 | Haying machine manufacturing | |
| 3220 | Headgear cover, except rubber, manufacturing | |
| 3559 | Headgear cover, rubber, manufacturing | |