| Martyr | W. A. | Avon Loc. 16963, Burracoppin | OM3 | 1924 |
| Marwick | A. W. | Glen Irwin, York | 3AM and 28C, 44E | 1962 |
| Marwick | Anna | York | AM5 | 1912 |
| Marwick | C. J. | Greenmantle, Perillup, via Mt. Barker | 4MK and 3A, 1C | 1962 |
| Marwick | Clennell J. | Edinia, Popanyinning | 4MA | 1926 |
| Marwick | H. F. | Eaglemont, Denmark | Y1K and 27A, 106B | 1962 |
| Marwick | Jack | Yangedine, Beverley East | YN1 | 1924 |
| Marwick | P. S. | Kildare, Noggerup | PM1 and 20A, 34B | 1962 |
| Marwick | W. J. & S. J. | Meadows, York East | AM5 | 1925 |
| Marwick | W. J. & S. J. | The Meadows, York | AM5 and 71B, 25A | 1962 |
| Marwick | Warren | Mortlock, York | 3MO | 1912 |
| Marwick | Warren | Mortlock, York | 3MO | 1924 |
| Marwick | Wm. | Commonage, Roebourne | Y1K | 1924 |
| Marwick Bros. | - | The Willows, York | 3MO and 53F, 9D | 1962 |
| Marwivck | Anna | York | AM5 | 1924 |
| Mary Springs Grazing Co. | - | Mary Springs, Northampton | G4H and 11D, 32E | 1962 |
| Mas | M. | 1076, 649, 2028, Yookgarillup, via Busselton | E3Z | 1962 |
| Mas | M. & S. I. | 2469, 4110, 2478, 2747, 2745, Sussex, Nillup, via Karridale | MM8 and 120E, 19C | 1962 |
| Masefield | M. | Geraining, Yanoning Rock, via Mukinbudin | 5MM and 23B, 102A | 1962 |
| Masiello | V. | 10243 Nelson, North Walpole | VM1 and 24E, 23B | 1962 |
| Maslin | Eliz | Devon Farm, Tambellup | 5ME | 1912 |
| Maslin | Eliz. | Devon Farm, Tambellup | 5ME | 1924 |
| Maslin | Frank | Tottenup, Upper Blackwood | F7M | 1912 |
| Maslin | Frank | Tootennup, Upper Blackwood | F7M | 1924 |
| Maslin | G. H. | Lot 119, Dardanup | G2M and 23A, 31B | 1962 |
| Maslin | George | Glenrowan, Bridgetown | 4DN | 1924 |
| Maslin | Guy | Rose Field Farm, Mullayup | M5O | 1924 |
| Maslin | T. H. | Commonage, Bridgetown | T8J | 1912 |
| Maslin | T. H. | Commonage, Bridgetown | T8J | 1924 |
| Mason | A. | Roscommon, Lowden | UN6 | 1924 |
| Mason | A. P. | Weinteriga, Jingalup, via Kojonup | PM2 and 14C, 48E | 1962 |
| Mason | D. R. M. | Avon Locs. 155639, 15124-5, Kunnunoppin | MV7 and 107A, 48B | 1962 |
| Mason | E. J. | Teamster, Pickering Brook | E6M | 1912 |
| Mason | E. J. | Pickering Brook | E6M | 1924 |
| Mason | Enoch | King Solomon's Palace, Carri Glen Serpentine | 4ME | 1912 |
| Mason | Enoch | King Soloman's Palace, Carriglen, Serpentine | 4ME | 1924 |
| Mason | Fredk. | Whitbank, Walyurin | QM0 | 1924 |
| Mason | G. E. | Avon 2183, 22685, 9295, Wooroloo | 3GM and 34D, 106E | 1962 |
| Mason | G. W. H. | Masonville, Gairdner River | 9GM and 120B, 14A | 1962 |
| Mason | George | Alwynne, Balbarrup | 9JY | 1924 |
| Mason | H. Wm. | Chininup Run. Tenterden | MV3 | 1912 |
| Mason | H. Wm. | Chininup Run, Tenterden | MV3 | 1924 |
| Mason | Jeffrey | Oakbank; Osborne Park | JM4 | 1928 |
| Mason | N. G. B. | Moorrattie | 1XL | 1924 |
| Mason | N. G. B. | Murchison | XL7 | 1924 |
| Mason | Stella. K. | Tenterden | Z9M | 1924 |
| Mason | T. | Port. Swan Loc. University Estate No. 2103, Shenton Park | T7M and 54F, 119B | 1962 |
| Mason | T. J. | Paschendale, Wundowie | O1M and 14C, 120A | 1962 |
| Mason | Wm. | Boston, Miling | 3MQ | 1924 |
| Mason & Co. | L. | 8844, Watheroo | L2M and 3A, 46B | 1962 |
