| Middlemas & Co | - | 26 Queen Street, Perth | Overland | 7681 | Metro Private Car | 1925-26 |
| Middlemas & Co | - | 26 Queen Street, Perth | Overland | 7681 | Metro Private Car | 1926-27 |
| Middlemas & Co | - | 26 Queen Street, Perth | Overland | 7681 | Metro Private Car | 1927-28 |
| Middlemass | R. W. | 35 Loch Street, Claremont | Ford | 1845 | Metro Private Car | 1925-26 |
| Middlemass | R. W. | 35 Loch Street, Claremont | Ford | 1845 | Metro Private Car | 1926-27 |
| Middletin Main Road Board | J.D. | - | Dodge | BY ● 37 | Bunbury Road Board | 1927-28 |
| Middleton | - | Jarrahdale | Ford Truck | SJ ● 81 | Serpentine-Jarrahdale Road Board | 1926-27 |
| Middleton | - | Jarrahdale | Ford Truck | SJ ● 81 | Serpentine-Jarrahdale Road Board | 1927-28 |
| Middleton | - | Serpentine | Ford | SJ ● 111 | Serpentine-Jarrahdale Road Board | 1927-28 |
| Middleton | A. | Balingup | Oldsmobile | BN ● 51 | Balingup Road Board | 1927-28 |
| Middleton | A. L. | 6 Mill Street, Perth | Buick | 1667 | Metro Private Car | 1927-28 |
| Middleton | A. W. | North Dandalup | Ford Truck | MY ● 93 | Murray Road Board | 1925-26 |
| Middleton | A. W. | North Dandalup | Ford Truck | MY ● 93 | Murray Road Board | 1926-27 |
| Middleton | Edward | Jarrahdale | Excelsior | SJ ● 5 | Serpentine-Jarrahdale Road Board | 1922-23 |
| Middleton | George | Kojonup | Overland | KO ● 38 | Kojonup Road Board | 1927-28 |
| Middleton | O. H. | Mill Street, Perth | Dodge | 8401 | Metro Private Car | 1925-26 |
| Middleton | O. H. | 6 Mill Street, Perth | Austin | 704 | Metro Private Car | 1926-27 |
| Middleton | O. H. | C/o Vacuum Oil Co.Perth | Dodge | 704 | Metro Private Car | 1927-28 |
| Middleton & Sons | N. | Kulin | Ford Truck | KU ● 94 | Kulin Road Board | 1927-28 |
| Middlewich | S. | 201 Murray Street, Perth | Citroen | 7554 | Metro Private Car | 1925-26 |
| Middlewick | Mrs E. | Cnr. Glenroyd & Walcott Street, Perth | Austin | 13083 | Metro Private Car | 1926-27 |
| Middlewick | S. | 201 Murray Street, Perth | Citroen | 7554 | Metro Private Car | 1926-27 |
| Middlewick | S. | 201 Murray Street, Perth | Citroen | 7554 | Metro Private Car | 1927-28 |
| Midland Junction & Districts | - | - | Ford Ambulance | 1594 | Metro Private Car | 1927-28 |
| Midland Junction District | - | - | Ford | 1594 | Metro Private Car | 1926-27 |
| Midwinter | C. | Commonwealth Hotel, Geraldton | Nash | GN 127 | Geraldton Municipality | 1927-28 |
| Miers | Jno. | 68 High Street, Fremantle | Ford | 1845 | Metro Private Car | 1923-24 |
| Miers | John G. | 68 High Street, Fremantle | Ford | 1844 | Metro Private Car | 1922-23 |
| Mighall | E. | Koorda | Ford | WM ● 105 | Wyalkatchem Road Board | 1925-26 |
| Mighall | E. | Koorda | Ford | WM ● 105 | Wyalkatchem Road Board | 1926-27 |
| Mighall | E. A. | Koorda | Ford | WM ● 105 | Wyalkatchem Road Board | 1924-25 |
| Mighall | R. | Koorda | Standard | WM ● 305 | Wyalkatchem Road Board | 1927-28 |
| Miguel | F. | Hope Valley | Gray Truck | RO ● 24 | Rockingham Road Board | 1925-26 |
| Miguel | F. | Hope Valley | Gray Truck | RO ● 24 | Rockingham Road Board | 1926-27 |
| Miguel | J. | Nangeenan | Ford Truck | MD ● 128 | Merredin Road Board | 1925-26 |
| Miguel | J. | Newcarnie | Ford Truck | MD ● 128 | Merredin Road Board | 1926-27 |
| Miguel | J. | Newcarnie | Ford Truck | MD ● 213 | Merredin Road Board | 1927-28 |
| Miguel | J. A. | 7-Mile | Standard Wagon | RO ● 72 | Rockingham Road Board | 1927-28 |
| Miguel | Mrs K. | Hope Valley | Republic | RO ● 63 | Rockingham Road Board | 1927-28 |
| Miguel Harrison San | - | Howard Place Perth | Renault | 2412 | Metro Private Car | 1922-23 |
| Mijen | A. | Wyalkatchem | Cleveland | WM ● 82 | Wyalkatchem Road Board | 1926-27 |
| Mijen | A. | Wyalkatchem | Cleveland | WM ● 82 | Wyalkatchem Road Board | 1927-28 |
| Milalrs & Co | T. & T. | Marine Terrace, Geraldton | Essex | GN 35 | Geraldton Municipality | 1924-25 |
| Milbank | C. | Bayview Mansions Claremont | Columbia | 7507 | Metro Private Car | 1925-26 |
| Milbank | C. H. | 13 The Mansions. Saint George's Terrace, Perth | Columbia | 4205 | Metro Private Car | 1924-25 |
| Milbank | C. H. | Perth | Colombia | 4205 | Metro Private Car | 1925-26 |
| Mildwater | E. | Wagin | Ford 20 H.P. | WM ● 10 | Wagin Municipality | 1919 |
| Mildwater | E. | Wagin | Maxwell 17 H.P. | WM 10 | Wagin Municipality | 1922-23 |
| Mildwater | Mrs R. | Narembeen | Oakland | NB ● 48 | Narembeen Road Board | 1927-28 |
| Mildwater | R. | Narembeen | Chevrolet | NB ● 48 | Narembeen Road Board | 1925-26 |
