| Klopper | H. F. | Careena, Bridgetown | 8OZ | 1924 |
| Klopper | H. R. | Glynden, Greenmount | K1H and 119A, 9B | 1962 |
| Klopper | L. J. | Nelson 810, Bridgetown | K4L and 56F, 17B | 1962 |
| Klopper | L. V. | Homestead, Upper Blackwood | O3K | 1925 |
| Klopper | L. V. | Three Brooks, Winnejup, via Bridgetown | O3K and 19B, 8E | 1962 |
| Klopper & Forrester | - | Highercombe, Gingin | KF1 | 1912 |
| Klopper & Forrester | - | Highercombe, Gingin | KF1 | 1924 |
| Kloss | Fredk. | Homestead,Wagin | FK4 | 1912 |
| Kloss | Fredk. | Homestead, Wagin | FK4 | 1924 |
| Klotzbach | C. H. | Brookleigh, Donnybrook | 4HK | 1912 |
| Klotzbach | C. H. | Brookleigh, Donnybrook | 4HK | 1924 |
| Klowss | A. S. | 1347, Esperance | AK6 and 16B, 42A | 1962 |
| Klug | Est. of H. E. | Koompartoo, Williams | H1K and 40E, 17D | 1962 |
| Klug | Harold Ernest | Koompartoo, Williams | K7V | 1925 |
| Kluth | K. J. | Fairview, Wiluna | K1K and 6E, 37D | 1962 |
| Knapp | B. M. (Mrs) | Allandale, Darkan | K4B and 22D, 108E | 1962 |
| Knapp | D. Henry | Springfield, Torbay | 8DK | 1924 |
| Knapp | E. C. | Hill Grove, Greenough | GK1 | 1912 |
| Knapp | E. C. | Hill Grove, Greenough | GK1 | 1924 |
| Knapp | F. V. | Allandale, Darkan | FK9 and 60F, 10D | 1962 |
| Knapp | Fred T. | C. P. 16170/35. 16254/55, Boyup Brook,Upper Blackwood | FK2 | 1912 |
| Knapp | Fred. T. | C.P. 16170/35, 16254/55, Boyup Brook, Upper Blackwood | FK2 | 1924 |
| Knapp | G. H. | Hillgrove, Greenough | GK3 | 1912 |
| Knapp | G. H. | Hillgrove, Greenough | GK3 | 1924 |
| Knapp | Geo. | Millidu, Ballidu | 4GK | 1924 |
| Knapp | H. E. | Uradale, Boyup Brook | I1K and 10B, 47E | 1962 |
| Knapp | J. W. | Locs. 2130, 2644, Kulja | WK4 and 103A, 10B | 1962 |
| Knapp | Jack & W. | Ballimena, Duli, via Wongan Hills | K4B | 1924 |
| Knapp | James | Woodside, Kronkupp | 1UK | 1912 |
| Knapp | James | Woodside, Kronkupp | 1UK | 1924 |
| Knapp | L. T. | Northlands, Boyup Brook | FK2 and 28B, 31E | 1962 |
| Knapp | R. | The Dell, Ballidu | 6RK and 20B, 47E | 1962 |
| Knapp | R. (jnr) | Bexley Farm, East Ballidu | RK0 and 80A, 18B | 1962 |
| Knapp | R. L. | Westwood Farm, Youngs Siding | R3K and 34C, 38A | 1962 |
| Knapp | Robt. | Young's Siding, via Denmark | 3KG | 1924 |
| Knapp | Robt. | The Dell, Ballidu | 6RK | 1924 |
| Knapp | Thos. | Springfiell, Torbay | 5JT | 1912 |
| Knapp | Thos. | Springfield, Torbay | 5JT | 1924 |
| Knapp | W. R. | 2564-61, 2130, 2101-2, Kulja | WK7 and 35A, 6B | 1962 |
| Knapp & Co. | G. E. | Millidu, Ballidu | 4GK and 22C, 47A | 1962 |
| Knapton | C. Wm. | Norlup Brook, Greenbushes | YK1 | 1912 |
| Knapton | C. Wm. | Norlup Brook, Greenbushes | YK1 | 1924 |
| Knapton | G. H. | Fernridge, Balingup | G0K and 37C, 47E | 1962 |
| Knapton | J. H. | SpringView, Greenbushes | J9K | 1912 |
| Knapton | J. H. | Spring View, Greenbushes | J9K | 1924 |
| Knapton | R. C. | Locs. 124, 715, 716, Balingup | YK1 and 12D, 16E | 1962 |
| Knapton | V. J. | Springview, Greenbushes | J9K and 26B, 31A | 1962 |
| Knarhoi | H. H. | Yalobia Station, Carnarvon | HK1 | 1912 |
| Knarhoi | H. H. | Yalobia Station, Carnarvon | HK1 | 1924 |
| Knauerhase | W. J. | Yerapin Estate Block No. 22, Bruce Rock | W2K and 29B, 32E | 1962 |
