| 1410 | Kaolin mining | |
| 2699 | Kaolin, processing beyond beneficiating | |
| 9241 | Karate school | |
| 5131 | Karate uniforms, women's and children's, wholesale | |
| 3512 | Kayaks, manufacturing | |
| 2694 | Keene's cement, manufacturing | |
| 2899 | Kegs, light gauge metal, manufacturing | |
| 2023 | Kegs, wood, coopered, manufacturing | |
| 1533 | Kelp meal and pellets, for use as animal feed, manufacturing | |
| 2423 | Kelp processing (i.e., for medicinal use) | |
| 3312 | Kelvin bridges (i.e., electrical measuring instruments), manufacturing | |
| 0122 | Kennels, breeding and raising stock for sale | |
| 9241 | Kennels, dog racing | |
| 0140 | Kennels, pet boarding | |
| 1421 | Kernite mining | |
| 1110 | Kerogen processing | |
| 3150 | Kerosene lamps, manufacturing | |
| 2930 | Kerosene space heaters, manufacturing | |
| 2320 | Kerosene, made in petroleum refineries | |
| 5141 | Kerosene, wholesale | |
| 1549 | Ketchup, manufacturing | |
| 2411 | Ketone compounds, not specified elsewhere by process, manufacturing | |
| 2930 | Kettles, electric, manufacturing | |
| 2812 | Kettles, heavy gauge metal, manufacturing | |
| 2893 | Key blanks, manufacturing | |
| 1912 | Key cases (except metal), manufacturing | |
| 2922 | Key cutting machines, manufacturing | |
| 5260 | Key duplicating service | |
| 5260 | Key duplicating shops | |
| 2899 | Key rings, made from purchased wire | |
| 3000 | Keyboards, computer peripheral equipment, manufacturing | |
| 3692 | Keyboards, piano or organ, manufacturing | |
| 5150 | Keying equipment, wholesale | |
| 3190 | Keyless entry systems, automotive, truck and bus, manufacturing | |
| 3220 | Keysets, telephone, manufacturing | |
| 8519 | Kidney dialysis centres | |
| 1712 | Kier bleaching, continuous machine, for the trade | |
| 4520 | Kiln construction, general contractors | |
| 2010 | Kiln drying of lumber | |
| 2692 | Kiln furniture, clay, manufacturing | |