| 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 |
| Kane | Margaret | Greenough Road, Geraldton | KN0 | 1912 |
| Kane | Margaret | Greenough Road, via Geraldton | KN0 | 1924 |
| Kannegiesser | Kurt | Manjimup | K6K | 1924 |
| Kanny | B. A. | Nelson Loc. 1122, Glenpennant, Manjimup | X9D and 118D, 112E | 1962 |
| Kanny | F. K. | Nelson 1497, Manjimup | K6K and 47B, 47E | 1962 |
| Kanny | P. | Glengarran, Manjimup | W8B and 44C, 84E | 1962 |
| Kanzler | E. W. | Murray Loc. 3, Pinjarra | E2K | 1962 |
| Kanzler | M. E. | Sandridge Farm, Harvey | 4MK | 1912 |
| Kanzler | M. E. | Sandridge Farm, Harvey | 4MK | 1924 |
| Kapor | I. | 6895, Morowa | 7KM and 14C, 110A | 1962 |
| Kapor | J. | Vic. Loc. 4526, and 7363, Morowa | EK8 and 7B, 33A | 1962 |
| Karafil | G. | Bushey Park, Marradong | GK7 and 29B, 5A | 1962 |
| Karafilis | C. & S. | 10977/8, Bridgetown | 6CT and 50B, 67A | 1962 |
| Karafilis | C. & S. | 10977/8, Bridgetown | 6UT and 50B, 67A | 1962 |
| Karafilis & Son | V. | Nelson 7163, 6672, 7263, 7264, 1108, 9790, Bridgetown | VK7 and 5A 8B | 1962 |
| Karafilis & Son | V. | Nelson 7163, 6672, 7263, 7264, 1108, 9790, Bridgetown | VK7 and 5A, 8B | 1962 |
