| 1810 | Hats, fur-felt, straw and wool-felt, made from purchased fabric | |
| 5232 | Hats, ladies', retail | |
| 1810 | Hats, leather, manufacturing | |
| 3699 | Hats, made from purchased paper | |
| 1730 | Hats, made in knitting mills | |
| 5131 | Hats, men's and boys', wholesale | |
| 1810 | Hats, trimmed, made from purchased fabric | |
| 5131 | Hats, women's, children's and infants', wholesale | |
| 5131 | Hats, women's, misses' and girls', wholesale | |
| 6023 | Hauling crude oil | |
| 6023 | Hauling pulpwood | |
| 6023 | Hauling, by dump truck | |
| 6023 | Hauling, farm to market | |
| 6023 | Hauling, farm to market, local | |
| 5121 | Hay and fodder, wholesale | |
| 0111 | Hay and grain farming, combination | |
| 2921 | Hay balers and presses, farm type, manufacturing | |
| 2915 | Hay conveyors, manufacturing | |
| 0140 | Hay drying service | |
| 0111 | Hay farming | |
| 2893 | Hay forks, manufacturing | |
| 0140 | Hay mowing, raking, baling and chopping | |
| 1533 | Hay, cubed, manufacturing | |
| 5121 | Hay, wholesale | |
| 5150 | Haying machinery, wholesale | |
| 2921 | Haying machines, manufacturing | |
| 6023 | Hazardous materials trucking using specialized equipment, long-distance | |
| 9000 | Hazardous waste collection | |
| 9000 | Hazardous waste disposal | |
| 9000 | Hazardous waste material disposal sites | |
| 9000 | Hazardous waste material treatment and disposal sites | |
| 0113 | Hazelnuts farming | |
| 2429 | Head cleaners for magnetic tape equipment, manufacturing | |
| 1531 | Head rice, manufacturing | |
| 8532 | Head Start centres (except formal schooling) | |
| 8532 | Head Start centres (except in conjunction with schools) | |
| 1810 | Headbands, made from purchased fabric | |
| 3610 | Headboards, wood, manufacturing | |
| 0200 | Heading bolts, wood, hewn, logging | |
| 2023 | Heading, barrel (i.e., cooperage stock), wood, manufacturing | |