| Cowcher | S. T. | Williams, L., Williams | 2SC and 116A, 39C | 1962 |
| Cowcher | T. S. & D. E. | Dulverton, W. Narrogin | E5D and 17C, 47A | 1962 |
| Cowcher | T. S. & D. E. | Geeralying, W. Narrogin | S2C and18B, 20E | 1962 |
| Cowcher | V. A. J. S. | Lyndhurst, Quindanning via Williams | 4CH and 27B, 33E | 1962 |
| Cowcher | W. G | Hillcrest, Williams | E7C and 10B, 22E | 1962 |
| Cowcher | W. M. (Miss) | Geeralying, Narrogin | W2C and 7D, 80E | 1962 |
| Cowcher Bros. | - | Dookenine, Williams | F2G | 1927 |
| Cowcill | A. | Romlea Farm, Quairading | 40C and 3C, 40E | 1962 |
| Cowcill | Alfred | Romlea Farm, Quairading | 4OC | 1924 |
| Cowcill | C. | Plant. 5797, Albany | C8C and 17C, 24A | 1962 |
| Cowcill | l. | Hill Grove, Quairading | 6LC and 22C, 110A | 1962 |
| Cowcill Co. | G. A. | 27421, 25737, 26003, 12597, 21893, 10557, 17523, 16053, 19542, 2194, Quairading | GC8 and 10C, 9A | 1962 |
| Cowden | R. Brooke | School Grounds, Toodyay | KC3 | 1912 |
| Cowden | R. Brooke | Toodyay | KC3 | 1924 |
| Cowell & Sons | G. E. | Shadwell Park, Midland Junction | 9GC and 3B, 106E | 1962 |
| Cowen | W. J. | Bridgetown | WC9 | 1912 |
| Cowen | W. J. | Bridgetown | WC9 | 1924 |
| Cowens | R. | Butterfly Station, Kookynie | XF9 | 1924 |
| Cowin | R. K. & E. N. | Toorackie, Tarwongup, via Williams | TC1 and 7B, 105A | 1962 |
| Cowin | T. A. | Hurtle Vale, Highbury | T0C | 1924 |
| Cowles & Son | - | Hyams, Gabbin, Bencubbin | 3EC and 31B, 110E | 1962 |
| Cowley | J. F. & G. | L Lot 3, L Lot 2, Beechboro, via Bayswater | 9CJ and 12E, 34B | 1962 |
| Cowley | John A. | Lone Hollow, Near Nannup, Sussex Mill, Dellerton | Q1O | 1925 |
| Cowling | D. & L. | Woodhouse Farm, Kojonup | EA6 and 84B, 6E | 1962 |
| Cowling | E. W. | Roe Location 445, Karlgarnen, via Kondinin | YV6 | 1924 |
| Cowling | Frederick G. B. | Wellington Loc. 3329, Elgin, Capel | 6QU | 1925 |
| Cownie | John S. | Nelson Location 7971, Greenbushes | 4KN | 1924 |
| Cox | Arthur | Newnham, Kojonup via Springfield | 8CA | 1912 |
| Cox | Arthur | Newnham, Kojonup | 8CA | 1924 |
| Cox | B. R. | Kyogle, Quairading | 8CX | 1924 |
| Cox | C. & E. | Shovelong, Korrelocking | 0CX and 8D, 110E | 1962 |
| Cox | C. G. & M. D. | Denham Farm Vic. Loc. 6339 & 5347, Naraling, via Geraldton | 6CC and 13D, 35E | 1962 |
| Cox | C. P. | Rose Park, Hine's Hill | 2RL | 1912 |
| Cox | C. P. | Rose Park, Hines Hill | 2RL | 1924 |
| Cox | C. T. B. & I. M. | 2396, 184, Waroona | C3X and 17E, 110B | 1962 |
| Cox | C. V. | Statfield, Roelands | W6C and 116B, 106E | 1962 |
| Cox | D. G. & L. M. | Winchester Park, Pinjarra | Z4M and 114E, 29B | 1962 |
| Cox | D. L. | Illyee Station, Peak Hill | 0MZ | 1924 |
| Cox | D. L. | Pinjarra | 0SV | 1924 |
| Cox | D. M. (Mrs) | Minga Mia, Yericoin | O8W | 1962 |
| Cox | Don. Lind. | Wiluna | 9SV | 1924 |
| Cox | E. H. | Cloverdale, Kojonup | 8OX and 30D, 12E | 1962 |
| Cox | E. M. (Mrs) | Avon Loc. 16022, 16085-6-4, 15223-4, 17553, 23371, Kellerberrin | 3EC and 38C, 120A | 1962 |
| Cox | F. C | Avon Loc. 16085, 16085-6-4, 152223-4, 17553, 23371, Kellerberrin | OX4 and 5D, 38E | 1962 |
| Cox | F. H. | Avon Loc. 16085, 16086, 23371, 16086, 23371, 17553, 16084, 15223, 15224, 20389, Kellerberrin | 7FC and 12D, 109E | 1962 |
| Cox | F. W. | Sherwood, Katanning | FV5 and 13D, 42E | 1962 |
| Cox | G. | Block 28, Collie River, Burekup | C0X and 35B, 36E | 1962 |
| Cox | G. H. | Loc. 11462, Yorkrakine | G5C | 1912 |
| Cox | G. H. | Loc. 11462, Yorkakine | G5C | 1924 |
| Cox | Geo. Wm. | Rocklee, Wickepin | 7CY | 1912 |
