| 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 |
| Mercantile Insurance Co | - | 9 Barrack Street, Perth | Ford | 5790 | Metro Private Car | 1926-27 |
| Mercantile Insurance Co | - | 9 Barrack Street, Perth | Ford | 5790 | Metro Private Car | 1927-28 |
| Mercantile Marine Ass. Co | - | Wellington Street, Perth | Ford | 932 | Metro Private Car | 1922-23 |
| Mercantile Mutual Ins Co | - | 9 Barrack Street | Chrysler | 13081 | Metro Private Car | 1927-28 |
| Mercantile Mutual Ins. Co | - | 9 Barrack St | Chrysler | 13081 | Metro Private Car | 1926-27 |
| Mercer | Benjamin | 550 Fitzgerald Street, North Perth | - | 329 | Metro Private Car | 1923-24 |
| Mercer | Benjamin | 550 Fitzgerald Street, North Perth | Bean | 329 | Metro Private Car | 1925-26 |
| Mercer | Benjamin | 550 Fitzgerald Street, North Perth | Bean | 329 | Metro Private Car | 1926-27 |
| Mercer | Benjamin | 550 Fitzgerald Street, North Perth | Chevrolet | 329 | Metro Private Car | 1926-27 |
| Mercer | Benjiman | 550 Fitzgerald Street, North Perth | Bean | 329 | Metro Private Car | 1927-28 |
| Mercer | F. D. | Kununoppin | Chevrolet | KTY ● 181 | Kununoppin-Trayning Road Board | 1927-28 |
| Mercer | H. K. | 85 Rokeby Road, Subiaco | Overland | 1264 | Metro Private Car | 1927-28 |
| Mercer | H. W. | 8 Stirling Street, Perth | Dodge | 9612 | Metro Private Car | 1926-27 |
| Mercer | H. W. | 8 Stirling Street, Perth | Dodge | 9612 | Metro Private Car | 1927-28 |
| Mercer | Horace W. | Shearer Street, Perth | B.S.A. 4¼ H.P. Motorcycle | P 859 | Perth Municipality | 1916 |
| Mercer | J. K. | York | Ford | Y 49 | York Municipality | 1925-26 |
| Mercer | J. K. | York | Ford | Y 49 | York Municipality | 1926-27 |
| Mercer | J. K. | York | Chevrolet | Y 45 | York Municipality | 1927-28 |
| Mercer | J. K. | York | Ford | Y 49 | York Municipality | 1927-28 |
| Mercer | Leslie | Amphion | Ford | MR ● 16 | Marradong Road Board | 1923-24 |
| Mercer | Mrs S. | York | Chevrolet | Y 45 | York Municipality | 1925-26 |
| Mercer | Mrs S. | York | Chevrolet | Y 45 | York Municipality | 1926-27 |
| Merchant | T. | Kellerberrin | Ford | KE ● 24 | Kellerberrin Road Board | 1922-23 |
| Mercom | C. | 491 Fitzgerald Street, Mount Lawley | Essex | 735 | Metro Private Car | 1927-28 |
| Mercy | J. A. | Isseka | Dodge | NR ● 61 | Northampton Road Board | 1924-25 |
| Mercy | J. A. | Isseka | Dodge | NR ● 61 | Northampton Road Board | 1925-26 |
| Mercy | J. A. | Isseka | Dodge | NR ● 61 | Northampton Road Board | 1926-27 |
| Mercy | J. A. | Isseka | Dodge | NR ● 61 | Northampton Road Board | 1927-28 |
| Meredith | E J. | Lake Grace | Rugby | LG ● 135 | Lake Grace Road Board | 1927-28 |
| Meredith | F. C. | Shackleton | Chevrolet | BK ● 307 | Bruce Rock Road Board | 1927-28 |
| Meredith | G. B. | Katanning | Ford | KA ● 204 | Katanning Road Board | 1927-28 |