| Margaret Downs Pastoral Coy. | - | Margaret Downs, West Kimberley | E7U | 1924 |
| Margaret River High School | | Local Grounds, Margaret River | 3MR, 118B, 14A | 1962 |
| Margee | Jas. | Mullinee, Norhampton | MJ0 | 1912 |
| Margee | Jas. | Mullinee, Northampton | M7O | 1924 |
| Marilla Station Co. | - | Minderoo Station; Via Onslow | SU7 | 1928 |
| Marilla Station Pty. Ltd. | | Marilla Station, Carnarvon | SU7, 44C, 18A | 1962 |
| Marillana Pastoral, Co. ply. Ltd. | |
Marillana Station, Meekatharra, via Roy Hill | C9O, 12B, 46A | 1962 |
| Marinelli | A. | Stone House Farm, Kojonup | XG5, 34D, 29E | 1962 |
| Marinelli | A. R. | Changerup, Kojonup | 6RZ, 31D, 14E | 1962 |
| Marinelli | R. | Murray Locs. 1235, Waroona | U6M | 1962 |
| Marinik & Strika | - | Kellerberrin | M0S | 1912 |
| Marinik & Strika | - | Kellerberrin | M0S | 1924 |
| Marinoni | A. G. | Stone House Farm, Kojonup | XG5 | 1924 |
| Marion | Arthur J. | Regent Park, Kulin | 2KQ | 1925 |
| Mark | R. S. | Sunnyside, Boolading Siding | R5M | 1912 |
| Mark | R. S. | Sunnyside, Boolading Siding | R5M | 1924 |
| Mark | Wm. John | Esperance Loc. 918, Seaddan | NQ0 | 1924 |
| Markey | A. | Avon Loc. 392, Toodyay | 3MY, 26A, 14C | 1962 |
| Markey | A. J. | Green Hil, Toodyay | H0M, 84E, 42D | 1962 |
| Markey | E. M. | Jumperding, Toodyay | M3K, 18D, 16E | 1962 |
| Markey | Honora | Elmore Dairy, Narrogin | 8MY | 1924 |
| Markey | J. C. | Salt Valley, Newcastle | J3J | 1912 |
| Markey | J. C. | Salt Valley, Toodyay | J3J | 1924 |
| Markey | Michael C. | Cobbler Pool, Jumperdine, Newcastle | M3K | 1912 |
| Markey | Michael C. | Cobbler Pool, Jumperdine, Toodyay | M3K | 1924 |
| Markey | W. J. & R. M. | 3902 and Loc. Marybrook | 0ZB, 28E, 115B | 1962 |
| Markham | H. C. | Marham's Well, Perenjori | 5XO | 1924 |
| Markham | H. C. | Caramah | OC8 | 1924 |
| Markham | Jas. | Murin | QN0 | 1924 |
| Markham | Lorenso | Wedgearrup via Wagin | L4M | 1924 |
| Markham | Lorenzo | Wedgecarrup, Wagerup | L4M | 1912 |
| Markham | R. P. | Loc. 1532 Sunney, Kudardup | 5PM, 42C, 117A | 1962 |
| Markham | W. G. & M. J. | Spring Valley, West Wagin | L4M, 14C, 22A | 1962 |
| Marks | D. W. | New Moon, Bowgada | VM9, 117A, 44B | 1962 |
| Marks | Henry T. | Badgerlin Farm, South Tammin | H4M | 1926 |
| Marks | Owen H. | Rockdale, West Dale, Beverley | 0HM | 1926 |
| Marks | Rosetta | Badgerlin Farm, South Tammin | 2RM | 1926 |
| Marks | W. O. | Staple Farm, Perillup | 0WM, 105E, 44D | 1962 |
| Marks | William | Glenelg, South Fremantle | 7MV | 1924 |
| Marle | Henry | Kudardup, via Busselton | IM6 | 1928 |
| Marle | J. J. | East Highbury | 3XN | 1924 |
| Marley | B. & C. J. | Otley Park, Buckingbams, via Collie | J4B, 3A, 80C | 1962 |
| Marley | H. J. | Wellington Loc. 4408, Shotts, via Collie | MX9, 36B, 106E | 1962 |
| Marley & Son | H. | Foyns Farm Victoria Loc. 2009, Maja | 2XJ, 71B, 6E | 1962 |
| Marlow | George R. F. | Norlup Park Estate, c/o P.O., Greenbushes | V9X | 1925 |
| Marlow | Mrs Ellen | Merredin | 5MO | 1924 |
| Marlow | Walter E. | Pt. Avon Loc 20527, Bolgart | E2N | 1924 |
| Marlow. Co | A. E. | Victoria Loc. 2009 | E2N, 23D, 30E | 1962 |
| Marmion & Fleming | - | Commonage, Carnarvon | R7A | 1912 |
| Marmion & Fleming | - | Commonage, Carnarvon | R7A | 1924 |
