| 5139 | Ink, paste and solvent, office supply, wholesale | |
| 5149 | Ink, printer's, wholesale | |
| 5139 | Ink, writing, wholesale | |
| 3699 | Inked ribbons, manufacturing | |
| 5150 | Inked ribbons, wholesale | |
| 2929 | Inking rollers, manufacturing | |
| 2422 | Inkjet cartridges, manufacturing | |
| 2422 | Inkjet inks, manufacturing | |
| 2429 | Inks, drawing, stamp pad and writing, manufacturing | |
| 2422 | Inks, printing, manufacturing | |
| 0500 | Inland fishing, freshwater | |
| 6309 | Inland marine shipping agency | |
| 6120 | Inland water shipping | |
| 3311 | Inlays (dental), manufacturing | |
| 5510 | Inn (hotel) | |
| 1920 | Inner soles, leather, manufacturing | |
| 3610 | Inner spring mattresses, manufacturing | |
| 2511 | Inner tubes, manufacturing | |
| 5510 | Inns, furnishing food and lodging | |
| 2411 | Inorganic pigments (except bone, carbon and lamp black), manufacturing | |
| 7230 | Input preparation services, computer | |
| 3000 | Input/output equipment, computer, manufacturing | |
| 5139 | Insect control devices, electric, wholesale | |
| 0140 | Insect control for crops | |
| 2899 | Insect screening, made from purchased wire | |
| 9232 | Insectaria | |
| 0140 | Insecticide spraying service, crops and plants (except from aircraft) | |
| 5239 | Insecticides and weed killers, retail | |
| 2421 | Insecticides, agricultural, manufacturing | |
| 2421 | Insecticides, home and garden, manufacturing | |
| 2421 | Insecticides, manufacturing | |
| 5149 | Insecticides, wholesale | |
| 0140 | Insemination station, artificial, livestock | |
| 2893 | Inserts, cutting tool, manufacturing | |
| 0500 | Inshore fishing, salt water | |
| 0140 | Inspection and grading of agricultural products | |
| 6309 | Inspection and weighing services connected to water transportation | |
| 7513 | Inspection for labour standards, government | |
| 7499 | Inspection of commodities, not connected with transportation | |
| 6309 | Inspection or weighing service, truck transportation | |