| Kab | Mahomet | Coolgardie | KL4 | 1924 |
| Kaders | Abdul | Marble Bar | 2KA | 1924 |
| Kaeding | A. H. | 1170, Maida Vale | 2AK and 48B, 41E | 1962 |
| Kaeding | Frederick W. | Pleasanton Farm, Kulin | K1D | 1927 |
| Kahan | R. R. | Dorcenup, Kojonup | DE7 and 46A, 18B | 1962 |
| Kahl | James Wm. | Prospect Vale, Kununoppin | KW8 | 1924 |
| Kahl | L. W. & T. E. | Prospect Vale, Kununoppin | KW8 and 23B, 71A | 1962 |
| Kahl | M. L. | Avonlea Farm, Loc. 18071, 10696, Merredin | 3ZS and 20B, 56F | 1962 |
| Kain | V. & E. | Mymore, Tarwonga | 1XF and 13B, 19E | 1962 |
| Kain & Sons | J. V. | Coorraminning, Narrogin | 5JK and 102B, 15A | 1962 |
| Kain & Sons | V. & E. | Mymore, Tarwonga | 1XF and 13B, 19E | 1962 |
| Kaiser | O. H. | Helenore, Yuna | K6B and 42B, 36E | 1962 |
| Kalajzic | M. & N. | 1547, 1557, Cadoux | N8K and 80E, 47D | 1962 |
| Kalajzie | M. & N. | 1547, 1557, Cadoux | N8K and 80E, 47D | 1962 |
| Kalamaras | A. | 9752-3, Manjimup | KA4 and 17E, 49B | 1962 |
| Kalamunda Golf Club Inc. | Canning Locs. 563, 963, 6725 | Kalamunda | KG5 and 48D, 50E | 1962 |
| Kalcke-King & King | - | Westlands, South Kwollyinn | B1K | 1912 |
| Kalgan Plains Pastoral Co. | - | Kalgan Plains, Mt. Barker | 9FD and 20B, 108E | 1962 |
| Kalgan Plains Pstoral Co. | - | Kalgan Pains, Mt. Barker | 9FD and 20B, 108E | 1962 |
| Kalgoorlie & Boulder Firewood Co. | - | Erlistoun, Laverton | 5KF | 1912 |
| Kalgoorlie & Boulder Firewood Co. | - | Erlistoun, Laverton | 5KF | 1924 |
| Kalgoorlie Municipal Coucil | - | Municipal Pound, Kalgoorlie | K7P | 1912 |
| Kalgoorlie Municipal Council | - | Municipal Pound, Kalgoorlie | K7P | 1924 |
| Kalgoorlie Roads Board | - | Kalgoorlie | KB4 | 1924 |
| Kalinowsky | J. C. | Kalvia Park, Boddington | K2V and 9A, 30B | 1962 |
| Kalinowsky | J. C. | Kalvi Park, Boddington | K2V and 9A, 30B | 1962 |
| Kallacha & Jellad | - | Leonora | 2KJ | 1912 |
| Kallacha & Jellad | - | Leonora | 2KJ | 1924 |
| Kalli Pastoral Co. | - | Kalli Station, Cue | XO5 and 15D, 12E | 1962 |
| Kalli Station Co. | - | Kalli Station, Cue | XO5 | 1924 |
| Kalmund | A. V. | Commonage, Kellerberrin | KA8 | 1924 |
| Kammann | E. R. | Lake Muir, Manjimup | 1VL | 1962 |
| Kammann | F. | Finsbury, Manjimup | 4KB and 34C, 5A | 1962 |
| Kammann | F. | Hyde Park, Manjimup | FK6 and 17B, 116A | 1962 |
| Kammann | G. M. H. | Dixie, Manjimup | 1XY and 22C, 11E | 1962 |
| Kammann | G. M. H. | Dixie, Manjmup | 1YX and 22C, 11E | 1962 |
| Kammann | J. F. | Finsbury, Balbarrup | 4KB | 1912 |
| Kammann | J. F. | Finsbury, Balbarrup | 4KB | 1924 |
| Kammann | L. J. | Glenburn, Manjimup | VY5 | 1962 |
| Kammann | P. F. | Glenburn, Manjimup | 0VT | 1962 |
| Kammann | W. L. | Hillbrook, Manjimup | 0UX and 57F, 27B | 1962 |
| Kamo Pastoral Co. | - | Kamo, Pinjarra | KP2 and 48B, 48E | 1962 |
| Kamo Pastroal Co. | - | Kamo, Pinjarra | KP2 and 48B, 48E | 1962 |
| Kan | Fred. John | Meadow Dale, Coorow | F5K | 1924 |
| Kan | P. G. | Parkdale, Wagerup | 9NX | 1924 |
| Kane | F. J. | Townhead, Roelands | J5K and 13B, 84E | 1962 |
| Kane | J. H. | Broadlands, Newdegate | JK6 and 42C, 53F | 1962 |
| Kane | J. H. | Broadlands, Newdegate | JK6 and 42C, 53F | 1962 |
| Kane | James | Clifton Area, Roelands | J5K | 1912 |
| Kane | James | Clifton Area, Roelands | J5K | 1924 |
