| May | J. J. | Brunswick | Ford | H ● 158 | Harvey Road Board | 1926-27 |
| May | J. J. | Brunswick | Ford | H ● 158 | Harvey Road Board | 1927-28 |
| May | J. W. | Kellerberrin | Triumph 3½ H.P. Motorcycle | KE ● 13 | Kellerberrin Road Board | 1917-18 |
| May | J. W. | Kellerberrin | Buick | KE ● 193 | Kellerberrin Road Board | 1926-27 |
| May | K. | Eleanor Street, Geraldton | Gray | GN 144 | Geraldton Municipality | 1927-28 |
| May | Mrs E. | 5 Williams Road, Fremantle | Buick | 9219 | Metro Private Car | 1925-26 |
| May | Mrs E. | 5 Williams Road, Fremantle | Buick | 9219 | Metro Private Car | 1926-27 |
| May | Mrs E. | 5 William Street, Fremantle | Buick | 9219 | Metro Private Car | 1927-28 |
| May | R. A | - | Buick | MW ● 56 | Mullewa Road Board | 1927-28 |
| May | Robt | Bridgetown | Chevrolet | B ● 92 | Bridgetown Road Board | 1927-28 |
| May | S. G. | Doodlakine | Ford | KE ● 4 | Kellerberrin Road Board | 1925-26 |
| May | S. G. | Doodlakine | Ford | KE ● 4 | Kellerberrin Road Board | 1926-27 |
| May | S. G. | Doodlakine | Ford | KE ● 4 | Kellerberrin Road Board | 1927-28 |
| May | W. | Holyoake | Chevrolet | MY ● 1 | Murray Road Board | 1926-27 |
| May | W. | Holyoake | Chevrolet | MY ● 1 | Murray Road Board | 1927-28 |
| May | W. T. | Young,s Siding | Oldsmobile | A ● 46 | Albany Road Board | 1927-28 |
| May Ltd | M. A. | Saint Georges House, Perth | Ford | 13226 | Metro Private Car | 1926-27 |
| Mayberry | W. J. | Lake Brown via Nugarin | Dodge | 11382 | Metro Private Car | 1926-27 |
| Mayberry | W. J. | Nungarin | Studebaker | NA ● 163 | Nungarin Road Board | 1927-28 |
| Mayer | P. A. | 890 Hay Street, Perth | Ford | 696 | Metro Private Car | 1922-23 |
| Mayger | J. F. | West Swan | Studebaker | 4791 | Metro Private Car | 1926-27 |
| Mayger | J. F. | West Swan | Studebaker | SW ● 34 | Swan Road Board | 1927-28 |
| Maylands Board of Health | - | Maylands | Dennis Wagon | 6001 | Metro Private Car | 1927-28 |
| Maylands Local Board of Health | - | - | Dennis Truck | P ● 221 | Perth Road Board | 1927-28 |
| Maynard | C. T. | 140 Palmer Street, Perth | Excelsior & Sidecar | 880 | Metro Motorcycle | 1922-23 |
| Maynard | F. | Doodenaning | Studebaker | Q ● 103 | Quairading Road Board | 1926-27 |
| Maynard | F. | Doodenanning | Studebaker | Q ● 103 | Quairading Road Board | 1927-28 |
| Maynard | F. L. | Durawah | Studebaker 20 H.P. | CU ● 5 | Upper Chapman Road Board | 1917-18 |
| Maynard | F. L. | Durawah | Studebaker 20 H.P. | CU ● 5 | Chapman Upper Road Board | 1919 |
| Maynard | F. L. | Northern Gully | Studebaker | CU ● 5 | Upper Chapman Road Board | 1922-23 |
| Maynard | F. L. | Northan Gully | Studebaker | CU 5 | Chapman Upper Road Board | 1923 - 1924 |
| Maynard | F. L. | Northern Gully | Studebaker | CU ● 5 | Upper Chapman Road Board | 1924-25 |
| Maynard | George | Kondinin | Chevrolet | KN ● 9 | Kondinin Road Board | 1925-26 |
| Maynard | H. J. | 6 Hooper Street, Perth | Dodge | 6249 | Metro Private Car | 1924-25 |
| Maynard | H. J. | 6 Hooper Street, West Perth | Dodge | 6249 | Metro Private Car | 1925-26 |
| Maynard | H. J. | 6 Hooper Street, West Perth | Dodge | 6249 | Metro Private Car | 1926-27 |
| Maynard & Evans | - | Doodenanning | Graham Truck | Q ● 107 | Quairading Road Board | 1927-28 |
| Mayne | R. D. | View Road, Maylands | Chevrolet | 9162 | Metro Private Car | 1925-26 |
| Mayne | R. D. | 135 8th Avenue, Maylands | Chevrolet | 9162 | Metro Private Car | 1926-27 |
| Mayne | R. D. | 135 8th Avenue, Maylands | Chevrolet | 9162 | Metro Private Car | 1927-28 |
| Mayo | J. | Manjimup | Chevrolet | WA ● 255 | Manjimup Road Board | 1927-28 |
| Mayo | M. | 828 Hay Street, Perth | Morris-Cowley | 13569 | Metro Private Car | 1926-27 |
| Mayo | M. E. | 828 Hay Street, Perth | Morris-Cowley | 13569 | Metro Private Car | 1927-28 |
| Mayor | Albert | 609 Wellington Street, Perth | Overland 15 H.P. | P 97 | Perth Municipality | 1916 |
| Mayor | Albert | 609 Wellington Street | Buick 16 H.P. | P 97 | Perth Municipality | 1917-18 |
| Mayor | Albert | Saint George's House | Overland 15 H.P. | P 97 | Perth Municipality | 1919 |
| Mayor | G. | Northampton | Grey | NR ● 101 | Northampton Road Board | 1925-26 |
| Mayrhofer | Dr | Three Springs | Ford | CA ● 267 | Carnamah Road Board | 1927-28 |
| Mayros | G. S. | Quairading | Arrol-Johnston | Q ● 55 | Quairading Road Board | 1925-26 |
| Mays | W. A. | Greenbushes | Ford | GR ● 17 | Greenbushes Road Board | 1927-28 |