| McDonnell | M. J.L.A. & H. A. | Mileen, Merredin | MH8 and 119D, 105E | 1962 |
| McDonnell | M. W. | Block 226, Harvey | M4T and 80D, 20E | 1962 |
| McDonnell | P. A. | Primrose Farm, Nanson | M7D and 17C, 3E | 1962 |
| McDonnell | P. Jas. | Ruby Plains Station, Halls Creek | N1N | 1912 |
| McDonnell | P. Jas. | Ruby Plains Station, Hall's Creek | N1N | 1924 |
| McDonnell | T. J. & J. V. | Sussex Loc. 1502 and 4016, Karridale | JM5 and 22C, 49E | 1962 |
| McDonnell | V. F. & T. J. | 95, 232, 175, Kwolyin | VF3 and 15B, 114A | 1962 |
| McDougall | A. V. | Glendore, Katanning | 1VN | 1924 |
| McDougall | A. V. | Glendore, Katanning | 1VN and 39D, 21E | 1962 |
| McDougall | Albert Jas. | Braeside and Boonadine, Talbot Brook, via York | A9S | 1924 |
| McDougall | C. A. | Clifton Grange, Gnowangerup | C0M and 45C, 109A | 1962 |
| McDougall | C. E. | Forrest Grove via Wagin | ME8 and 21D, 15E | 1962 |
| McDougall | E. & L. S. | Braeside, Talbot Brooke, via York | A9S and 54F, 33C | 1962 |
| McDougall | E. R. V. | 12116, 13227, Wagin | 8NM and 105B, 7A | 1962 |
| McDougall | H. J. | Brook View, Narrogin | MD7 | 1912 |
| McDougall | H. J. | Brook View, Narrogin | MD7 | 1924 |
| McDougall | I. J. & H. S. | Allandale, Katanning | 6DM and 28B, 41E | 1962 |
| McDougall | Jacob Wm. | Allandale, Katanning | 6DM | 1924 |
| McDougall | K. | Acadia and Lilydale, Tinkurrin and Ockley and Arthur River | J6D and 53F, 10C | 1962 |
| McDougall | M. | Acadia, Tinkurrin | MV6 and 28C, 111E | 1962 |
| McDougall | Neil | South Perth | 1NM | 1912 |
| McDougall | Neil | South Perth | 1NM | 1924 |
| McDougall | Neil jun. | Roseberry Avenue, South Perth | 0ND | 1924 |
| McDougall | O. | Brook View, Narrogin | MD7 and 7D, 11E | 1962 |
| McDougall | P. J. | Boonadine, Talbot Brook | M4C | 1912 |
| McDougall | P. J. | Boonadine, Talbot Brook | M4C | 1924 |
| McDougall | R. | Boyning, Wickepin | M3U and 8D, 103E | 1962 |
| McDougall | R. K. | 11441, 12188, 10738, 13149, 10629, 12390, 7054, East Katanning | 5RN and 37D, 110E | 1962 |
| McDougall | Thos. | Orchard, Busselton | ND0 | 1924 |
| McDougall (Jnr.) | N. | Clydesdale Street, South Como | 0ND | 1962 |
| McDougall Bros. | - | Glendoore, Katanning | 1VN | 1912 |
| McDougall-Ralston | R. F. | Donnelly Park, Donnelly River, Manjanupp | Z3T | 1912 |
| McDowall | J. | Done Roving Farm, Boodarockin | 9MC and 5B, 116A | 1962 |
| McDowall | K. J. | Amaroo, Rock Gully via Mt Barker | KJ2 and 33C, 34E | 1962 |
| McDowall | P. J. | 1072, 983, 1010, Bullfinch | MP1 and 27D, 17E | 1962 |
| McDowall | Robt. M. | Commonage, Augusta | BA3 | 1924 |
| McDowall | S. A. | Kortnong, Dowerin | S0M | 1912 |
| McDowall | S. A. | Kortnong, Dowerin | S0M | 1924 |
| McEllister | R. J. & L. | Holm Hill, Narrogin | 4ML and 47B, 119A | 1962 |
| McEllister & Bevan | - | White Park, East Wagin | Z8N | 1924 |
| McElroy | David | Oldfield Locs. 62 and 374, Ravensthorpe | DM7 | 1926 |
| McEncrae | Jas. | Livery Stables, Kalgoorlie | 6MC | 1912 |
| McEncroe | Jas. | (Livery Stables), Kalgoorlie | 6MC | 1924 |
| McEvoy | J. M | Rheola, Grass Valley | 5VY | 1962 |
| McEvoy | John. M. | Rheola, Grass Valley | 5VY | 1924 |
| McEvoy & Gemmell | - | Cugaling via Toodyay | M8G | 1912 |
| McEvoy & Gemmell | - | Cugaling, via Toodyay | M8G | 1924 |
| McEwen | D. E .T | Sunbeam Dairy, Swan Loc. 34 | 1SJ | 1962 |
| McEwin | J. G. | Innisfail, Cookernup | N1O and 20D, 14E | 1962 |
| McEwin | John | Brook Ewin, Cookernup | N1O | 1912 |
