| McKercher | J. C. | MacDonald Street Osborne Park | Ford | 1209 | Metro Private Car | 1924-25 |
| McKercher | J. C. | McDonald Street, Osborne Park | Ford | P ● 90 | Perth Road Board | 1925-26 |
| McKewer McBeath & Co | - | William Street | Dodge | 13880 | Metro Private Car | 1927-28 |
| McKie | G. W. | Cunderdin | Chevrolet | ME ● 58 | Meckering Road Board | 1926-27 |
| McKie | G. W. | Cunderdin | Chevrolet | ME ● 58 | Meckering Road Board | 1927-28 |
| McKie | R. | Kumminin | Chevrolet | BK ● 265 | Bruce Rock Road Board | 1927-28 |
| McKillop | L. J. | Yeovil Crescent, Bicton | Ford | 11748 | Metro Private Car | 1927-28 |
| McKinlay | W. | Rockingham | Overland | RO ● 32 | Rockingham Road Board | 1925-26 |
| McKinlay | W. | Rockingham | Overland | RO ● 32 | Rockingham Road Board | 1926-27 |
| McKinlay | W. | Rockingham | Overland | RO ● 32 | Rockingham Road Board | 1927-28 |
| McKinley | Claude W. | 41 Pennant Street, North Perth | Chrysler | 11969 | Metro Private Car | 1927-28 |
| McKinley | E. J. | Dowerin | Ford 19 H.P. | D ● 28 | Dowerin Road Board | 1922-23 |
| McKinley | E. J. | Dowerin | Ford 19 H.P. | D ● 28 | Dowerin Road Board | 1923-24 |
| McKinley | E. J. | Round Hill | Ford | M ● 67 | Moora Road Board | 1924-25 |
| McKinley | E. J. | Round Hill | Ford | M ● 67 | Moora Road Board | 1925-26 |
| McKinley | E. J. | Round Hill | Ford | M ● 67 | Moora Road Board | 1926-27 |
| McKinley | E. J. | Round Hill | Ford | M ● 67 | Moora Road Board | 1927-28 |
| McKinley | E. M. | 41 Permont Street, North Perth | Citroen | 5804 | Metro Private Car | 1925-26 |
| McKinley | E. M. | 41 Permont Street, Mount Lawley | Citroen | 5804 | Metro Private Car | 1926-27 |
| McKinley | V. G. | Ravensthorpe | Chevrolet | PR ● 30 | Phillips River Road Board | 1927-28 |
| MCKinley-Wood | W. | c/r Woods Motor Works Victoria Park | Chand. | 5150 | Metro Private Car | 1924-25 |
| McKinna Bros | - | Mangaroon Station | Buick | GU ● 12 | Upper Gascoyne Road Board | 1925-26 |
| McKinna Bros | - | Mangareen Station | Ford | GU ● 45 | Upper Gascoyne Road Board | 1925-26 |
| McKinna Bros | - | Mangaroon Station | Buick | GU ● 12 | Upper Gascoyne Road Board | 1926-27 |
| McKinnon | - | Augusta | Chevrolet | AU ● 76 | Augusta Road Board | 1927-28 |
| McKinnon | A. | Marble Bar | Ford Wagon | MB ● 4 | Marble Bar Road Board | 1925-26 |
| McKinnon | D. | Bunbury | Hupmobile | By 60 | Bunbury Municipality | 1922-23 |
| McKinnon | D. | Bunbury | Hupmobile | BY 60 | Bunbury Municipality | 1923 - 1924 |
| Mckinnon | Mrs | - | Ford | NA ● 23 | Nungarin Road Board | 1924-25 |
| McKinnon | Mrs | - | Ford | NA ● 23 | Nungarin Road Board | 1927-28 |
| McKinnon | W. N. | Dowerin | Gray | D ● 76 | Dowerin Road Board | 1924-25 |
| McKinnon | W. N. | Dowerin | Gray | D ● 76 | Dowerin Road Board | 1925-26 |
| McKinnon | W. N. | Dowerin | Gray | D ● 76 | Dowerin Road Board | 1926-27 |
| McKinnon | W. N. | Dowerin | Oldsmobile | D ● 76 | Dowerin Road Board | 1927-28 |
| McKintosh | A. J. | 80 Monmouth Street, North Perth | Ford | 5809 | Metro Private Car | 1924-25 |
| McKittrick | G. A | Nannup | Chevrolet | BL ● 44 | Nannup Road Board | 1926-27 |
| Mcknight | H. A. | Wagin | Ford | WN 51 | Wagin Municipality | 1926-27 |
| McKnight | H. A. | Wagin | Ford | WN 51 | Wagin Municipality | 1927-28 |
| McKnow | W. A. | Karalee | Ford | YL ● 32 | Yilgarn Road Board | 1926-27 |
| McKormack | - | 2 Mann Street, Cottesloe | Overland | 9243 | Metro Private Car | 1926-27 |
| McKower McBeath & Co | - | William Street | Dodge | 13880 | Metro Private Car | 1926-27 |
| McKumon | A. | Marble Bar | Ford Truck | MB ● 35 | Marble Bar Road Board | 1926-27 |
| McLachlan | A. | 10 Roy Street, Mount Lawley | Chevrolet | 5639 | Metro Private Car | 1924-25 |
| McLachlan | D. | Redcliffe Park Belmont | Oldsmobile | 3354 | Metro Private Car | 1924-25 |
| McLachlan | D. | Redcliffe Belmont | Chevrolet | 6722 | Metro Private Car | 1924-25 |
| McLachlan | D. | Redcliffe Park Belmont | Oldsmobile | 3354 | Metro Hire or Trade | 1925-26 |
| McLachlan | D. | Redcliffe Belmont | Ford | 6722 | Metro Private Car | 1925-26 |
| McLachlan | D. | Redcliffe Belmont | Ford | 6722 | Metro Private Car | 1926-27 |
| McLachlan | D. | Redcliffe Belmont | Ford | 6722 | Metro Private Car | 1927-28 |
| McLachlan | H. | 5 North Street, Midland Junction | Chevrolet | 5220 | Metro Private Car | 1926-27 |