| Mengler | G. | - | Royal Enfield 2½ H.P. Motorcycle | KMC 5 | Kalgoorlie Municipality | 1915 |
| Mengler | G. | Campbell Street | Studebaker 20 H.P. | KMC 25 | Kalgoorlie Municipality | 1916 |
| Mengler | G. | Campbell Street | Royal Enifield 2¾ H.P. Motorcycle | KMC 5 | Kalgoorlie Municipality | 1916 |
| Mengler | G. | Goldsworthy Road, Claremont | Studebaker | 2423 | Metro Private Car | 1922-23 |
| Mengler | G. | 19 Agett Road, Claremont | Hudson | 2423 | Metro Private Car | 1927-28 |
| Mengler | Gus. | Goldsworthy Road, Claremont | Studebaker | 2423 | Metro Private Car | 1923-24 |
| Mengler | Gus. | Goldsworthy Road, Claremont | Studebaker | 2423 | Metro Private Car | 1924-25 |
| Mengler | Gus. | Goldsworthy Road, Claremont | Studebaker | 2423 | Metro Private Car | 1925-26 |
| MeNiel | S. F. | Konnogorring | Ford | GO ● 23 | Goomalling Road Board | 1922-23 |
| Menmuir | David M. | 8 Hope Street, Perth | Essex | 2368 | Metro Private Car | 1927-28 |
| Mennhennett | J. H. | Balingup | Chevrolet | BN ● 8 | Balingup Road Board | 1927-28 |
| Menoalawitz | M. | 26 Burt Street, North Perth | Chevrolet | 13394 | Metro Private Car | 1927-28 |
| Mentiplay | - | - | Ford 16½ H.P. | GN 31 | Geraldton Municipality | 1917-18 |
| Mentiplay | - | - | Hupmobile 20 H.P. | GN 31 | Geraldton Municipality | 1919 |
| Mentiplay | D | Grant Street, Geraldton | Hupmobile | GN 31 | Geraldton Municipality | 1926-27 |
| Mentiplay | D. | Geraldton | Ford 16½ H.P. | GN 31 | Geraldton Municipality | 1916 |
| Mentiplay | D. | Grant Street, Geraldton | Hupmobile | GN 31 | Geraldton Municipality | 1922-23 |
| Mentiplay | D. | Grant Street, Geraldton | Hupmobile | GN ● 31 | Geraldton Municipality | 1923-24 |
| Mentiplay | D. | Grant Street, Geraldton | Hupmobile | GN 31 | Geraldton Municipality | 1924-25 |
| Mentiplay | D. | Grant Street, Geraldton | Hupmobile | GN 31 | Geraldton Municipality | 1925-26 |
| Menzel | Belle Florist | William Street, Perth | Austin | 1592 | Metro Private Car | 1927-28 |
| Menzies | A. Junior | Katanning | Dodge | KA ● 329 | Katanning Road Board | 1927-28 |
| Menzies | A. T. | Narrogin | Overland 19 H.P. | NGN 107 | Narrogin Municipality | 1922-23 |
| Menzies | A. T. | Narrogin | Overload | NGN 107 | Narrogin Municipality | 1923-24 |
| Menzies | A. T. | Narrogin | Overland | NGN 107 | Narrogin Municipality | 1924-25 |
| Menzies | A. T. | Narrogin | Overland | NGN 107 | Narrogin Municipality | 1925-26 |
| Menzies | P. | 40 Beaufort Street | Humberette 7 H.P. | P 30 | Perth Municipality | 1915 |
| Menzies | P. | 7 Fairfield Street, Mount Hawthorn | Citroen | 676 | Metro Private Car | 1922-23 |
| Menzies | P. | 7 Fairfield Street, Mount Hawthorn | Citroen | 676 | Metro Private Car | 1923-24 |
| Menzies | P. | 77 Fairfield Street, Mount Hawthorn | Willy-Knight | 5233 | Metro Private Car | 1924-25 |
| Menzies | Peter | 77 Fairfield Street | Dodge 20 H.P. | P 676 | Perth Municipality | 1919 |
| Menzies | Peter | 77 Fairfield Street, Mount Hawthorn | Willys-Knight | 1334 | Metro Private Car | 1924-25 |
| Menzies | Peter | 77 Fairfield Street, Mount Hawthorn | Velle | 1334 | Metro Private Car | 1925-26 |
| Menzies | Peter | 77 Fairfield Street, Mount Hawthorn | Vetie | 1334 | Metro Private Car | 1926-27 |
| Menzies | Peter | 77 Fairfield Street, Mount Hawthorn | Velie | 1334 | Metro Private Car | 1927-28 |
| Menzies | R. L. | 77 Fairfield Street, Mount Hawthorn | Austin | 13916 | Metro Private Car | 1926-27 |
| Menzies | R. L. | 77 Fairfield Street, Mount Hawthorn | Austin | 13916 | Metro Private Car | 1927-28 |
| Menzies Road Board | - | Menzies | Chevrolet Truck | MN ● 88 | Menzies Road Board | 1927-28 |
| Menzise | P. | 7 Fairfield Street, Mount Hawthorn | Citroen | 676 | Metro Private Car | 1924-25 |
| Meo | Wm. B. | Chidlow Street | Ford | N 32 | Northam Municipality | 1927-28 |
| Meolen | H. | Williams | Ford | WL ● 47 | Williams Road Board | 1927-28 |
| Meolin | H. | Williams | Ford | WL ● 47 | Williams Road Board | 1926-27 |
| Mephan Ferguson Ltd | - | Maylands | Essex | 2818 | Metro Private Car | 1924-25 |
| Mephan Ferguson Ltd | - | Maylands | Chenar Walcher | 5670 | Metro Private Car | 1924-25 |
| Mephan Ferguson Ltd | - | Maylands | Essex | 2818 | Metro Private Car | 1925-26 |
| Mephan Ferguson Ltd | - | Perth | Chenard-Walcher | 5670 | Metro Private Car | 1925-26 |
| Mercantile Ins Co | - | 9 Barrack Street, Perth | Ford | 5790 | Metro Private Car | 1924-25 |
| Mercantile Ins. Co | - | 9 Barrack Street, Perth | Maxwell | 5735 | Metro Private Car | 1926-27 |
| Mercantile Ins. Co | - | 9 Barrack Street, Perth | Maxwell | 5735 | Metro Private Car | 1927-28 |
| Mercantile Insurance Co | - | 9 Barrack Street, Perth | Ford | 5790 | Metro Private Car | 1925-26 |