| Mertield & Holmes | - | Albany | Studebaker 20 H.P. | A 80 | Albany Municipality | 1922-23 |
| Merton | H. A. | Queens Hotel, Perth | Hupmobile | 2449 | Metro Private Car | 1922-23 |
| Merton | H. A. | Queens Hotel, Perth | Hupmobile | 2449 | Metro Private Car | 1923-24 |
| Merton | H. A. | Queen's Hotel, Beaufort Street, Perth | Hup. | 6295 | Metro Private Car | 1924-25 |
| Merton | H. A. | Queens Hotel, Beaufort Street, Perth | Hupmobile | 6295 | Metro Private Car | 1925-26 |
| Merton | H. A. | Queens Hotel, Beaufort Street, Perth | Hupmobile | 6295 | Metro Private Car | 1926-27 |
| Merton | H. A. | Queen's Hotel, Beaufort Street, Perth | Willys-Knight | 246 | Metro Private Car | 1927-28 |
| Merton | J. H. | 223 Berwick Street, Victoria Park | Nash | 1956 | Metro Private Car | 1927-28 |
| Merton | R. | Parrington Road, Spearwood | Brockway | 12271 | Metro Private Car | 1927-28 |
| Mesbury | F. R. | Gregory Street, Geraldton | Chevrolet Truck | GN 194 | Geraldton Municipality | 1927-28 |
| Messenger | H. K. | Toodyay | Ford 20 H.P. | T ● 34 | Toodyay Road Board | 1922-23 |
| Messenger | H. K. | Normans, Toodyay | Buick | T ● 34 | Toodyay Road Board | 1925-26 |
| Messenger | H. K. | Nunyle | Buick | T ● 34 | Toodyay Road Board | 1926-27 |
| Messenger | H. K. | Nunyle | Buick | T ● 34 | Toodyay Road Board | 1927-28 |
| Messenger | H. M. | Toodyay | Ford | T ● 34 | Toodyay Road Board | 1923-24 |
| Messenger | L. F. | South Kalgoorlie G.M. | Overland | K ● 40 | Kalgoorlie Road Board | 1924-25 |
| Messer | D. H. | 282 Aberdeen Street, Perth | Overland | 8617 | Metro Private Car | 1927-28 |
| Messer | K. D. | Minnie Creek, Carnarvan | Ford 15-20 H.P. | GU 7 | Gascoyne upper Road Boards | 1916 |
| Messer | K. D. | Minnie Creek | Ford 15-20 H.P. | GU ● 7 | Upper Gascoyne Road Board | 1917-18 |
| Messer | K. D. | Minnie Creek | Ford 20 H.P. | GU ● 7 | Gascoyne Upper Road Board | 1919 |
| Messer | K. D. | Minnie Creek | Ford 20 H.P. | GU ● 7 | Upper Gascoyne Road Board | 1922-23 |
| Messer | K. D. | Minnie Creek Station | Dodge 23 H.P. | GU ● 24 | Upper Gascoyne Road Board | 1922-23 |
| Messer | K. D. | Minnie Creek | Ford 20 H.P. | GU ● 7 | Gascoyne Upper Road Board | 1923-24 |
| Messer | K. D. | Minnie Creek Station | Dodge 23 H.P. | GU ● 24 | Gascoyne Upper Road Board | 1923-24 |
| Messer | K. D. | Minnie Creek | Ford | GU ● 7 | Upper Gascoyne Road Board | 1924-25 |
| Messer | K. D. | Minnie Creek Station | Dodge | GU ● 24 | Upper Gascoyne Road Board | 1924-25 |
| Messer | K. D. | Minnie Creek Station | Ford | GU ● 7 | Upper Gascoyne Road Board | 1925-26 |
| Messer | K. D. | Minnie Creek Station | Dodge | GU ● 24 | Upper Gascoyne Road Board | 1925-26 |
| Messer | K. D. | Minnie Creek Staion | Dodge | GU ● 24 | Upper Gascoyne Road Board | 1926-27 |
| Messer | K. D. | Minnie Creek | Dodge | GU ● 24 | Gascoyne Upper Road Board | 1927-28 |
| Messer & Lee Steere | - | Minnie Creek | Graham Truck | GU ● 5 | Upper Gascoyne Road Board | 1926-27 |
| Messer & Lee Steere | - | Minnie Creek | Chevrolet | GU ● 7 | Upper Gascoyne Road Board | 1926-27 |
| Messer, Messer & Lee Steere | - | Minnie Creek | Graham Truck | GU ● 5 | Gascoyne Upper Road Board | 1927-28 |
| Messer, Messer & Lee Steere | - | Minnie Creek | Chevrolet | GU ● 7 | Gascoyne Upper Road Board | 1927-28 |
| Messrs Cobb & Co | - | Black Range | Albion | BRRB 3 | Black Range Road Board | 1915 |
| Messrs Patterson & Co Ltd | - | William Street | Dodge 20 H.P. | P 732 | Perth Municipality | 1917-18 |
| Messrs. Benstead & Co | - | Dumbleyung | Dodge | DU ● 83 | Dumbleyung Road Board | 1924-25 |
| Messrs. Chesson & Heydon | - | Big Bell | Ford 15 H.P. | CD ● 8 | Cue-Day Dawn Road Board | 1919 |
| Messrs. Edgar & Biddle | - | Broome | Ford 20 H.P. | B 14 | Broome Municipality | 1916 |
| Messrs. French Bros. | - | Merragoolia Station | Dodge | GM ● 8 | Gascoyne-Minilya Road Board | 1923-24 |
| Messrs. Patterson & Co Ltd | - | William Street | Dodge 20 H.P. | P 732 | Perth Municipality | 1919 |
| Messrs. Streeter & Co | - | Broome | Ford 20 H.P. | B 11 | Broome Municipality | 1916 |
| Meston | W. P. | 32 Alma Road, North Perth | Rugby | 7914 | Metro Private Car | 1925-26 |
| Meston | W. P. | 32 Alma Road, North Perth | Rugby | 7914 | Metro Private Car | 1926-27 |
| Meston | W. P. | 32 Alma Road, North Perth | Rugby | 7914 | Metro Private Car | 1927-28 |
| Metam | F. | 83 Third Avenue, Maylands | Ford | 8445 | Metro Private Car | 1927-28 |
| Metcalf | A. A. | Dowerin | Ford 20 H.P. | D ● 5 | Dowerin Road Board | 1917-18 |
| Metcalf | A. A. | Dowerin | Ford 20 H.P. | D ● 5 | Dowerin Road Board | 1919 |
| Metcalf | A. A. | Dowerin | Dodge | D ● 5 | Dowerin Road Board | 1922-23 |
| Metcalf | A. A. | Dowerin | Essex | D ● 5 | Dowerin Road Board | 1923-24 |
