| Merryweather | Dr R. C. | 22 Saint George's Terrace, Perth | Essex | 16 | Metro Private Car | 1922-23 |
| Merryweather | Dr R. C. | 22 Saint George's Terrace | Chrysler | 7945 | Metro Private Car | 1925-26 |
| Merryweather | Dr W. J. | 22 Saint George's Terrace, Perth | Fiat | 212 | Metro Private Car | 1922-23 |
| Merryweather | Dr. | Aberdeen Street | Sunbeam 12 H.P. | P 16 | Perth Municipality | 1915 |
| Merryweather | Dr. | Aberdeen Street | Swift 11 H.P. | P 212 | Perth Municipality | 1915 |
| Merryweather | Dr. | 162 Aberdeen Street | Swift 11-9 H.P. | P 212 | Perth Municipality | 1916 |
| Merryweather | Dr. | 22 Saint George's Terrace, Perth | Fiat | 212 | Metro Private Car | 1923-24 |
| Merryweather | Dr. R. C. | Aberdeen Street | Sunbeam 12 H.P. | P 16 | Perth Municipality | 1916 |
| Merryweather | Dr. R. C. | 22 Saint George's Terrace | Crossley | 4791 | Metro Private Car | 1923-24 |
| Merryweather | Dr. Roy | Saint George's Terrace | Willy's-Knight | 16 | Metro Private Car | 1923-24 |
| Merryweather | Hilda B. | 50 Kings Park Road | Chrysler | 7945 | Metro Private Car | 1926-27 |
| Merryweather | Mrs H. B | 50 King's Park Road, Perth | Chrysler | 7945 | Metro Private Car | 1927-28 |
| Merryweather | R. C. | 162 Aberdeen Street | Overland 25 H.P. | P 16 | Perth Municipality | 1917-18 |
| Merryweather | R. C. | 162 Aberdeen Street | Overland 25 H.P. | P 212 | Perth Municipality | 1917-18 |
| Merryweather | R. C. | Saint George's Terrace | Overland 25 H.P. | P 16 | Perth Municipality | 1919 |
| Merryweather | R. C. | Saint George's Terrace | Overland 25 H.P. | P 212 | Perth Municipality | 1919 |
| Merser | G. H. | Narrogin | Ford | NGN 90 | Narrogin Municipality | 1925-26 |
| Merser | George | Wagin | Dodge | WN 3 | Wagin Municipality | 1927-28 |
| Merson | Alice | 80 Boundary Road, Midland Junction | Hupmobile | 11626 | Metro Private Car | 1926-27 |
| Merson | Alice | 80 Boundary Road, Midland Junction | Humpmobile | 11626 | Metro Private Car | 1927-28 |
| Merson | E. | Boundary Road | Ford 15 H.P. | MJ 44 | Midland Junction Municipality | 1919 |
| Merson | J. | 186 York Road, Midland | Ford | 1531 | Metro Private Car | 1924-25 |
| Merson | J. | 186 York Road, Midland Junction | Ford | 1531 | Metro Private Car | 1925-26 |
| Merson | J. E. | 186 York Road, Midland Junction | Rugby | 12008 | Metro Private Car | 1926-27 |
| Merson | Mrs A. | 80 Boundary Road, Midland Junction | Hupmobile | 4935 | Metro Private Car | 1924-25 |
| Merson | Mrs A. | 80 Boundary Road, Midland | Hupmobile | 4935 | Metro Private Car | 1925-26 |
| Merson | R. | 34 Northwood Street, West Leederville | Ford | 7241 | Metro Private Car | 1925-26 |
| Merson | R. | 34 Northwood Street, West Leederville | Ford | 7241 | Metro Private Car | 1926-27 |
| Merson | T. | Sayer Street | Ford 20 H.P. | MJ 23 | Midland Junction Municipality | 1916 |
| Merson | T. | 186 York Road, Midland | Ford | 1531 | Metro Private Car | 1922-23 |
| Merson | T. | 186 York Road, Midland | Ford | 1531 | Metro Private Car | 1923-24 |
| 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 |