| Commisso | P. | Locs. 209, 46, Harvey | C2Z and 102C, 37E | 1962 |
| Commisso & Deleo | - | Harvey AA 24, Hamel | C4D and 53F, 30D | 1962 |
| Commons | A. A. | Locs. 21059-16234, Narembeen | UC1 and 27D, 59F | 1962 |
| Commonwealth Railways | - | State of W. A. | CAR | 1912 |
| Commonwealth Railways | - | State of W.A. | C/|\R | 1924 |
| Commonwealth Railways | - | Port Augusta | C/|\R | 1962 |
| Compagnoni | W. J. & H. T. | Newleigh, Esperance | H8C and 30B, 118E | 1962 |
| Compton | Alfred A. O | Totnes, Denmark | O1Q | 1924 |
| Compton | G. S. | Cr. East and Helena Streets Moojelup, Guildford | 5SA | 1912 |
| Compton | G. S. | Moojelup, Cookernup, (cr. East and Helena Streets, Guildford) | 5SA | 1924 |
| Comtesse | Mary K. | Cobra Station, Carnarvon | K8T | 1924 |
| Comyns & Wilber | Charles W. & Stanley | Muchea | GW1 | 1927 |
| Condeena Estate | - | Condeena, Broomehill | TA3 and 1C, 114A | 1962 |
| Conder | H. J. | Condale Farm, Yelbeni | JD5 and 46D, 7E | 1962 |
| Conder | J. B. & E. | Lots 19077/74, 8230/68, Yelbeni | 0ZC | 1924 |
| Conder | J. B. & E. | Lots 19077/74, 8230/68, Yelbeni | 0ZC | 1962 |
| Conder, Conder & Bishop | - | Combis, Yorkrakine | B5D | 1924 |
| Conder, Conder, & Bishop | - | Combis, Yorkrakine | B5D | 1912 |
| Condon | H. J. | Loc. 1311 & 2731 & 203, Narrogin | CO2 and 28B, 116E | 1962 |
| Condon | R. | Riversdale, Cunderdin | C2N | 1912 |
| Condon | R. E. | Riversdale, Cunderdin | C2N | 1924 |
| Condren | B. | Boulder City Dairy, Boulder | B1C and 5B, 45E | 1962 |
| Condren | Bernard J. | Davies Road. Claremont | BG1 | 1928 |
| Condren | P. J. | Boulder City Dairy, Boulder | 7QD and 5B, 20E | 1962 |
| Condren | Patrick | Munster Dairy, Wanneroo Road | PK9 | 1924 |
| Condren | T. W. | Boulder City Dairy, Boulder | C7T and 102D, 5E | 1962 |
| Congdon | C. H. | Marjerate Farm, Ravensthorpe | CN0 | 1912 |
| Congdon | C. H. | Majerate Farm, Ravensthorpe | CN0 | 1924 |
| Congelan Park Grazing Co. | - | Congelan Park, Williams | 4FF and 51F, 118B | 1962 |
| Congram | W. G. | 8013-8014, Orchid Valley, W. Kojonup | 2CB and 34D, 108E | 1962 |
| Congrene | C. | Dulya, Pithara | 3CC and 116A, 26B | 1962 |
| Congrene | T. | Trevordale, Darkan | T8C and 118B, 120A | 1962 |
| Congreve | F. J. | Sprettion Park, Wickepin | 5SP | 1912 |
| Congreve | F. J. | Stretton Park, Wickepin | 5SP | 1924 |
| Connaughton | Fred | Kyaria, Meekatharra | FC3 | 1912 |
| Connaughton | Fred | Kyaria, Meekatharra | FC3 | 1924 |
| Connaughton | J. | Oscar Range Station, Fitzroy | JC6 | 1912 |
| Connaughton | J. | Oscar Range Station, Fitzroy | JC6 | 1924 |
| Connaughton | Jno. | Carnarvon | N0R | 1924 |
| Connaughton | Wm. | Windell Station and Milgan Station, Peak Hill | 0CN | 1912 |
| Connaughton | Wm. | Windell and Milgan Stations, Peak Hill | 0CN | 1924 |
| Connaughton & Co | F. | Kilrickle, Dalgooka, Bolinda, Parakalia, Three Springs & Mingenew | 8CF and 47D, 52F | 1962 |
| Connell | D. | Stirling Sub. 17, Capel | DO2 | 1912 |
| Connell | D. | Stirling Sub. Loc. 17, Capel | DO2 | 1924 |
| Connell | Daniel | State Mill, Fernbrook | 3VX | 1924 |
| Connell | F. C. | Homstead, Narrogin | F5C | 1912 |
| Connell | F. C. | Homestead, Narrogin | F5C | 1924 |
| Connell | J. H. | Springdale, Northam, Gosnell's Estate, Gosnells | JO6 | 1912 |
| Connell | J. H. | Springdale, Northam, Gosnell's Estate, Gosnells | JO6 | 1924 |
| Connell | J. M. & M. C. | Yilgarn 380, Westonia | M8C and 45B, 42A | 1962 |
