| Mottram | J. J. | Manjimup | Studebaker | WA ● 172 | Manjimup Road Board | 1927-28 |
| Mouch | C. | Millbrook | Studebaker | A ● 10 | Albany Road Board | 1925-26 |
| Mount Barker Estate | | Mount Barker | Dodge Truck | PL ● 33 | Plantagenet Road Board | 1926-27 |
| Mount Barker Estate | -- | Mount Barker | Dodge Truck | PL ● 33 | Plantagenet Road Board | 1925-26 |
| Mouritz | H. J. | Moornaming | Gray Truck | KT ● 56 | Kent Road Board | 1927-28 |
| Moustake | T. | 93 Colin Street, West Perth | Dodge | 14986 | Metro Private Car | 1927-28 |
| Moysey | B. | Lake Grace | Ford Truck | LG ● 45 | Lake Grace Road Board | 1926-27 |
| Moysey | B. | Lake Grace | Ford Truck | LG ● 45 | Lake Grace Road Board | 1927-28 |
| Muir | A. | Albany | Studebaker | A 54 | Municipality of Albany | 1925-26 |
| Muir | A. | Broadway, Nedlands | Studebaker | 4043 | Metro Private Car | 1926-27 |
| Muir | A. | Albany | Studebaker | A 54 | Albany Municipality | 1927-28 |
| Muir | A. (Junr.) | Forrest Hill, Mount Barker | Ford 20 H.P. | PL 8 | Plantagenet Road Board | 1915 |
| Muir | A. Jnr. | Albany | Studebaker | A 54 | Municipality of Albany | 1924-25 |
| Muir | A. jun | Forrest Hill | Studebaker 20 H.P. | PL ● 8 | Plantagenet Road Board | 1917-18 |
| Muir | A. Jun | Forest Hill, Mount Barker | Studebaker | PL ● 8 | Plantagenet Road Board | 1922-23 |
| Muir | A. Jun. | Forest Hill, Mount Barker | Studebaker | PL ● 8 | Plantagenet Road Board | 1923-24 |
| Muir | A. junior | Forest Hill | Studebaker 20 H.P. | PL ● 8 | Plantagenet Road Board | 1919 |
| Muir | A. Junr | Albany | Studebaker | A 54 | Municipality of Albany | 1926-27 |
| Muir | Andrew Junr. | Forrest Hill, via Mount Barker | Ford 20 H.P. | PL 8 | Plantagenet Road Board | 1916 |
| Muir | Robt. T. W. | Forrest Hill Mount Barker | Rugby | PL ● 116 | Plantagenet Road Board | 1924-25 |
| Muir | W. C. | Lake Muir | Graham Truck | WA ● 119 | Manjimup Road Board | 1926-27 |
| Muir | W. C. | Lake Muir | Graham Truck | WA ● 119 | Manjimup Road Board | 1927-28 |
| Muir | W. P. | Lake Muir | Dodge | WA ● 32 | Manjimup Road Board | 1925-26 |
| Muir | W. P. | Lake Muir | Dodge | WA ● 32 | Manjimup Road Board | 1926-27 |
| Muir | W. P. | Lake Muir | Dodge | WA ● 32 | Manjimup Road Board | 1927-28 |
| Muir | Wm Pointz | Lake Muir | Dodge | WA ● 32 | Warren Road Board | 1924-25 |
| Mulcahy Estate Late | D. | Milly Milly Station | Studebaker | MU ● 32 | Murchison Road Board | 1925-26 |
| Mullen & Pollard | - | Lake Grace | Ford Truck | LG ● 105 | Lake Grace Road Board | 1927-28 |
| Mullens | W. | Harrismith | Buick | WK ● 150 | Wickepin Road Board | 1925-26 |
| Mullens | W. | Harrismith | Buick | WK ● 150 | Wickepin Road Board | 1926-27 |
| Mullens | W. | Harrismith | Buick | WK ● 150 | Wickepin Road Board | 1927-28 |
| Mullins | H. J. | Waroona | Chevrolet | DK ● 53 | Drakesbrook Road Board | 1927-28 |
| Mullis | J. L. | Nannup | Studebaker | BL ● 8 | Nannup Road Board | 1926-27 |
| Mumme | M. | Tammin | Ford Truck | ME ● 229 | Meckering Road Board | 1926-27 |
| Mumme | M. | Tammin | Ford Truck | ME ● 229 | Meckering Road Board | 1927-28 |
| Muncey | M. S. Mrs | 105 Outram Street, West Perth | Studebaker | 3356 | Metropolitan Hire and Trade Cars | 1923-24 |
| Muncey | Mrs M. A. | Coliseum Buildings Rokeby Road, Subiaco | Oakland | 3530 | Metro Private Car | 1924-25 |
| Muncey | Mrs M. A. | Rokeby Road, Subiaco | Oakland | 3530 | Metro Hire or Trade | 1926-27 |
| Muncey | Mrs M.A. | Colissum Building Rokeby Road, Subiaco | Oakland | 3530 | Metro Hire or Trade | 1925-26 |
| Muncey Coliseum Buildings | Mrs M. A. | Rokeby Road, Subiaco | Oakland | 3530 | Metro Hire or Trade | 1927-28 |
| Munday | R. | Kellerberrin | Overland Truck | KE ● 197 | Kellerberrin Road Board | 1925-26 |
| Munday Bros | - | Kirks Rock | Ford | WK ● 61 | Wickepin Road Board | 1924-25 |
| Munday Bros | - | Yealering | Ford | WK ● 61 | Wickepin Road Board | 1925-26 |
| Munday Bros | - | Yealering | FORD | WK ● 61 | Wickepin Road Board | 1926-27 |
| Mundy | D. | Erlistoun | Studebaker 20 H.P. Private Car | MG ● 3 | Mount Magnet Road Board | 1917-18 |
| Mundy | D. | Erlistoun | Studebaker 20 H.P. | MG 3 | Mount Margaret Road Board | 1919 |
| Mundy | D. | Erlistoun | Studebaker 20 H.P. | MG ● 3 | Mount Margaret Road Board | 1922-23 |
| Mundy | D. | Erlistoun | Studebaker 20 H.P. | MG ● 3 | Mount Margaret Road Board | 1923-24 |
| Munro | D. G. | Parkerville | Ford Wagon | 3612 | Metro Hire or Trade | 1924-25 |
| Munro | D. G. | Parkerville | Ford Wagon | 3612 | Metro Hire or Trade | 1925-26 |
