| 3829 | Ice cabinet, commercial, manufacturing | |
| 3117 | Ice cream cone baking | |
| 3824 | Ice cream freezer manufacturing | |
| 3824 | Ice cream machinery manufacturing | |
| 3112 | Ice cream manufacturing | |
| 3112 | Ice cream mix manufacturing | |
| 6310 | Ice cream parlour | |
| 3112 | Ice cream powder manufacturing | |
| 3117 | Ice cream wafer baking | |
| 3829 | Ice crusher manufacturing | |
| 9490 | Ice hockey club | |
| 3903 | Ice hockey equipment manufacturing | |
| 3824 | Ice making machine manufacturing | |
| 3112 | Ice milk manufacturing | |
| 3112 | Ice milk mix manufacturing | |
| 3112 | Ice milk specialties manufacturing | |
| 3903 | Ice skate manufacturing | |
| 9490 | Ice skating rink operation | |
| 2909 | Iceland spar mining | |
| 3121 | Icing manufacturing | |
| 3909 | Identification badge manufacturing | |
| 3831 | Ignition apparatus manufacturing | |
| 3831 | Ignition cable set manufacturing | |
| 9513 | Ignition service, motor vehicle | |
| 4102 | Illuminating gas manufacturing | |
| 3620 | Illuminating glass manufacturing | |
| 3530 | Illuminating oil manufacturing | |
| 3833 | Immersion heater, electric, manufacturing | |
| 6100 | Implement, farm, wholesaling | |
| 3420 | Imprinting on paper | |
| 3839 | Incandescent filament lamp manufacturing | |
| 3529 | Incense manufacturing | |
| 5000 | Incinerator construction | |
| 3699 | Incinerator, concrete, manufacturing | |
| 3819 | Incinerator, excluding concrete, manufacturing | |
| 9100 | Income tax administration | |
| 3851 | Incubator, electric, manufacturing | |
| 3819 | Incubator, excluding wooden or electric, manufacturing | |
| 3529 | Indelible ink manufacturing | |
| 3529 | India ink manufacturing | |