| Maroni Bros. | - | Williams Loc. 9783 /4, 9793/4, 12571, 13901, 15039, Pingrup | 7MT, 9B, 29E | 1962 |
| Maroonah Pastoral Co. | - | Maroonah Station, Carnarvon | G7J, 17C, 10A. | 1962 |
| Marquand | Chas. Jas. | Esperance Loc. 557, Seaddan | QN4 | 1924 |
| Marr | E. J. | Strathpefier, Parkerville | EJ5, 28C, 14A | 1962 |
| Marr | Hugh | Lochnagar, Hopetown | 0XV | 1924 |
| Marren | Michael | Block 6586, Binnu | NK5 | 1924 |
| Marricup Pastoral Co. | - | Marricup, Kojonup | T8E, 15D, 116E | 1962 |
| Marriott | A. H. | Glenmore, Wagerup | 5AM | 1912 |
| Marriott | A. H. | Glenmore, Wagerup | 5A.M | 1924 |
| Marriott | Alfred & John | Avon loc. 9093, York | YQ3 | 1924 |
| Marriott | C. N. | Black Wattle, Frankland | 1OE, 58F, 104B | 1962 |
| Marriott | D. H. | Waterous Concession, Yarloop | Z5X | 1912 |
| Marriott | D. H. | Waterous Concession, Yarloop | Z5X | 1924 |
| Marriott | D. MeL. | Nelson 3899, 3802, 10167, Frankland | DM8 and 144B, 7E | 1962 |
| Marriott | D. W. | Riverdale, Brunswick | D7M | 1912 |
| Marriott | D. W. | Riverdale, Brunswick | D7M | 1924 |
| Marriott | Fanny | Cookernup, S. W. Railway | E2E | 1912 |
| Marriott | Fanny | Cookerup | E2E | 1924 |
| Marriott | G. F. | Glenmore, Wagerup | FM3 | 1912 |
| Marriott | G. F. | Glenmore, Wagerup | FM3 | 1924 |
| Marriott | H. K. | Canning Loc. 69, Welshpool | K9G and 14C, 47E | 1962 |
| Marriott | J. | Tongirin, Quairading | J6M and 42D, 4E | 1962 |
| Marriott | J. H. | Glenmore, Wagerup | ZM2 | 1924 |
| Marriott | J. H. | Glenmore, Wagerup | ZM2 | 1962 |
| Marriott | J. V. (Mrs) | Fern Park, Wagerup | 5AM and 108B, 108E | 1962 |
| Marriott | L. W. | Dorset Downs, Frankland | 2DD and 55F, 80B | 1962 |
| Marriott | N. | Tarbolton, Dorset Downs, via Kojonup | 1OT and 58F, 26B | 1962 |
| Marriott | S. L. | Cookernup and Cowcowon, Yarloop | Z7V | 1912 |
| Marriott | S. L. | Cookerup and Coweowon Yarloop | Z7V | 1924 |
| Marriott | Sidney C. | Inglewood, Toodyay | XQ5 | 1925 |
| Marriott | Thos. Jas. | Billurup, Waroona | 2ZX | 1912 |
| Marriott | Thos. Jas. | Billurup, Waroona | 2ZX | 1924 |
| Marriott | Wallace | Ballingup, Cookernup | W7M | 1912 |
| Marriott | Wallace | Billingup, Cookernup | W7M | 1924 |
| Marriott | Wm. | Dalgarup, Yarloop | ZX4 | 1912 |
| Marriott | Wm. | Dalgarup, Yarloop | ZX4 | 1924 |
| Marriott & Haviland | - | Alsha, Cunderdin | M9H | 1924 |
| Marris | C. | Sussex 1943-5, Karridale | L0X | 1962 |
| Marris | W. | Nelson Loc 6105, 3739, 3730, Donnelly River | 3NZ | 1924 |
| Marrone & Co. | N. | Glengower, Pithara | W2D and 54F, 30D | 1962 |
| Marschall | Mrs. M. L. | Eudunda, Badgebup Road, Katanning | 1XM | 1912 |
| Marsden | C. | Locs. 3389, 2967-8-9, 3064, Wonthella | 1PG and 33D, 59F | 1962 |
| Marsden | E. | Westfield Road, Armadale | X4E and 19B, 9E | 1962 |
| Marsden | J. A. | Sussex 1743, 2083, Cowaramup | YF2 | 1962 |
| Marsden | J. E. | Riversdale, Pingelly West | X4E | 1924 |
| Marsdens Pty. Ltd. | - | Victoria Loc. 196 and Pt. 2197, 1544, Geraldton | JU8 and 26D, 84E | 1962 |
| Marsehall | Mrs M. L. | Endunda Badgebup Road, Katanning | 1XM | 1924 |
| Marsh | A. E. | Avon loc 14271, 14252, Mt Marshall | UM6 | 1924 |
| Marsh | A. E. & D. M. | Aros, Hyden | 3MH and 49C, 33A | 1962 |
| Marsh | A. N. | Block 269 Cockburn Sound, Mundijong | A5M and 16B, 113A | 1962 |
