| Cohen & Pickering | - | Beachlands, Busselton | CP1 | 1912 |
| Cohen & Pickering | - | Beachlands, Busselton | CP1 | 1924 |
| Cohill | Elizabeth | Carrara, Nabawah | CE9 | 1912 |
| Cohill | Elizabeth | Carrara, Nabawa | CE9 | 1924 |
| Coker & Sudholz | - | Gelenella, Babakine, Kurrenkutten, via Wickepin | C5Z | 1912 |
| Coker & Sudholz | - | Gelenella, Babakin | C5Z | 1924 |
| Coker Bros. | (J. A. & W. F.) | Wilton Farm, Narembeen | 2CK and 22A, 43C | 1962 |
| Colbourne | E. J. J. | Wattle Grove Farm, Kulin | ZP8 and 22A, 45C | 1962 |
| Colbourne | W. J. M. | Watle Grove Farm, Kulin | ZP8 | 1924 |
| Colbourne | William | Wattle Grove Farm, Kulin | ZP8 | 1925 |
| Colder Bros. | - | Koolanooka | K6N | 1924 |
| Coldor Grazing Co. | - | 1474, Coolup | T6R and 118A, 117B | 1962 |
| Coldwell | F. | Canning | EC0 | 1924 |
| Coldwell | F. W. C. | Loc. 1415, Wongan Hills | FX5 | 1924 |
| Coldwell | Hamilton | Dowerin | 7HQ | 1924 |
| Cole | C. T. & E. A. | Vic. 9798 Manarra, Mingenew | CO6 and 42B, 80A | 1962 |
| Cole | Charles | Leamington Park, Doodening Creek, Kellerberrin | 5ZC | 1924 |
| Cole | D. W. | Killara Nel Loc. 11195, Nannup | 5DC | 1962 |
| Cole | E. F. | 18146, 22481, 22700, ete, Bruce Rock | E6C and 8D, 112E | 1962 |
| Cole | E. J. | Tangalooma, Denmark | EN4 | 1962 |
| Cole | G. & N. M. | 1210, Carnamah | 5IC and 15D, 42E | 1962 |
| Cole | Geo. | Cork Tree, Mt. Sir Samuel | G3C | 1912 |
| Cole | Geo. | Cork Tree, Mt. Sir Samuel | G3C | 1924 |
| Cole | H. | Division St. Lot 237, Welshpool | 8IC | 1962 |
| Cole | H. J. | Jillawarra, Dongara | C0L and 21C, 28E | 1962 |
| Cole | H. M. | Commonage, Caranrvon | M0X | 1912 |
| Cole | H. M. | Commonage, Carnarvon | M0X | 1924 |
| Cole | Herbert John | Yanda, Mingenew | G0L | 1928 |
| Cole | I. & G. | Attwood, Bullaring | L2C and 21C, 24E | 1962 |
| Cole | John | Frazier Downs Station, La Grange Bay | J5N | 1924 |
| Cole | Leslie James | Attwood, Bullaring | L2G | 1926 |
| Cole | Mabel M. | Mabel Downs, Turkey Creek | C4C | 1924 |
| Cole | O. J. | Block 16291, Bruce Rock, Mungarin, via Doodlakine | 06C | 1912 |
| Cole | O. J. | Block 16291, Bruce Rock | O6C | 1924 |
| Cole | R. O. | 16291, Bruce Rock | C9R and 10C, 117A | 1962 |
| Cole | R. T. | Passehendale, Bruce Rock | 4RC and 32C, 59F | 1962 |
| Cole | Sarah G. | Block 3907, Morowa | 7CQ | 1924 |
| Cole | Thos. | Monavale Station, Wiluna | TU5 | 1924 |
| Cole | W. D. | Bullfinch | 3DX | 1924 |
| Cole | W. D. & M. T. | Dalaroo Lots 1, 2 & 25, Moora | WC2 and 31D, 80E | 1962 |
| Cole | William | Boo River, Wyndham | C7E | 1912 |
| Cole | William | Boo River, Wyndham | C7E | 1924 |
| Cole | William | Padbury avenue, Upper Swan | VX6 | 1924 |
| Cole & Co. | G. | Limit & K 43, 44, 244, 30, 232, 388, 231, 33, 189, 374, 28, 237, 307, 235, Kellerberrin | I2W and 50C, 23E | 1962 |
| Cole. | Thos. | Monavlae Station, Wiluna | TU5 | 1912 |
| Colegate | R. R. | Holmdene, Yandanooka | Q5C and 60F, 5B | 1962 |
| Coleman | A. E. | Summerset, Armadale | KO3 | 1924 |
| Coleman | A. J. | Hollands Park Loc. 917, Lake Biddy | 9AC and 6C, 105A | 1962 |
| Coleman | Albert Thomas Milton | Arakon, Oldbury via Mundijong | A5G | 1926 |
| Coleman | E. F. V. | Bushy Park, Marradong | EC2 and 12D, 117E | 1962 |
