| Mouchemore | B. B. | Augusta | Overland 30 H.P. | AU 3 | Augusta Road Board | 1916 |
| Mouchemore & Co | - | Albany | Dealers | A 96 | Albany Municipality | 1927-28 |
| Moulder | W. | Carnarvon | Ford 15 H.P. | GM ● 34 | Gascoyne-Minilya Road Board | 1919 |
| Moule | Dr E. E. | Wagin | Dodge | WM 7 | Wagin Municipality | 1922-23 |
| Moule | Dr E. E. | Wagin | Dodge | WN 7 | Wagin Municipality | 1925-26 |
| Moule | Dr E. E. | Wagin | Dodge | WN ● 7 | Wagin Municipality | 1926-27 |
| Moule | Dr E. E. | Wagin | Austin | WN 7 | Wagin Municipality | 1927-28 |
| Moule | Dr. E. E. | Wagin | Dodge 20 H.P. | WM ● 13 | Wagin Municipality | 1919 |
| Moule | Dr. E. E. | Wagin | Dodge | WM ● 7 | Wagin Municipality | 1923-24 |
| Moulin | A. W. | 133 Adelaide Terrace | Ford 20 H.P. | P 610 | Perth Municipality | 1916 |
| Moulin | A. W. | 42 Mount Street, Perth | Buick | 610 | Metro Private Car | 1923-24 |
| Moulle | J. | Forest House. Saint George's Terrace, Perth | Overland | 8213 | Metro Private Car | 1925-26 |
| Moullin | A. W. | 133 Adelaide Terrace | Ford 20 H.P. | P 610 | Perth Municipality | 1915 |
| Moullin | A. W. | 133 Adelaide Terrace | Buick 20 H.P. | P 610 | Perth Municipality | 1917-18 |
| Moullin | A. W. | 42 Mount Street | Buick 20 H.P. | P 610 | Perth Municipality | 1919 |
| Moullin | A. W. | 42 Mount Street, Perth | Buick | 610 | Metro Private Car | 1922-23 |
| Moullin | Alfred W. | Esplanade Peppermint Grove | Buick | 610 | Metro Private Car | 1925-26 |
| Moullin | Alfred. W. | Esplanade Peppermint Grove. | Buick | 610 | Metro Private Car | 1924-25 |
| Moullin | Marion | 42 Mount Street | Buick 15 H.P. | P 986 | Perth Municipality | 1917-18 |
| Moullin & Co | J. H. & A. | Saint George's Terrace, Perth | Trailer | 10736 | Metro Hire or Trade | 1927-28 |
| Moullin & Co Ltd | J. H. | 132 Saint George's Terrace | Brockway Truck | 10582 | Metro Hire or Trade | 1927-28 |
| Moullin Co Ltd | J. H. | Saint George's Terrace | Brookway Truck | 10658 | Metro Hire or Trade | 1927-28 |
| Moulton | B. J. | Beverley | Ford | BE ● 131 | Beverley Road Board | 1923-24 |
| Moulton | E. J. | Beverley | - | BO ● 40 | Brookton Road Board | 1924-25 |
| Moulton | E. J. | Beverley | Ford | BO ● 40 | Brookton Road Board | 1925-26 |
| Moulton | E. J. | Beverley | Ford | BO ● 40 | Brookton Road Board | 1926-27 |
| Moulton | E. J. | Beverley | Ford | BO ● 40 | Brookton Road Board | 1927-28 |
| Moulton | E. L. | Boyup Brook | Chevrolet | BU ● 15 | Upper Blackwood Road Board | 1927-28 |
| Moulton | J. | Beverley | Ford | BE ● 131 | Beverley Road Board | 1924-25 |
| Moulton | J. F. | Dale Beverly | Ford | BE ● 131 | Beverley Road Board | 1925-26 |
| Moulton | J. F. | Dale Beverley | Ford | BE ● 131 | Beverley Road Board | 1926-27 |
| Moulton | J. F. | Beverley | Ford | BE ● 131 | Beverley Road Board | 1927-28 |
| Moulton | J. M. | Dale Beverly | Chevrolet | BE ● 240 | Beverley Road Board | 1925-26 |
| Moulton | J. M. | Dale. Beverley | Chevrolet | BE ● 240 | Beverley Road Board | 1926-27 |
| Mound | J. | Sir Samuel | Overland | LA ● 11 | Lawlers Road Board | 1926-27 |
| Mounsey | R. | 210 Hampton Road, Nedlands | Morris Cowley | 14352 | Metro Private Car | 1927-28 |
| Mount | J. E. | 32 East Street, Maylands | Scat | 1075 | Metro Private Car | 1925-26 |
| Mount | J. E. | 32 East Street, Maylands | Dodge | 1571 | Metro Private Car | 1927-28 |
| Mount Augustus Pastoral Co | - | Mount Augustus | Dodge | GU ● 40 | Upper Gascoyne Road Board | 1924-25 |
| Mount Augustus Pastoral Co | - | Gascoyne Junction | Dodge | GU ● 40 | Upper Gascoyne Road Board | 1925-26 |
| Mount Augustus Pastoral Co | - | Mount Augustus Station | Dodge | GU ● 40 | Gascoyne Upper Road Board | 1927-28 |
| Mount Barker Estate | | Mount Barker | Dodge Truck | PL ● 33 | Plantagenet Road Board | 1926-27 |
| Mount Barker Estate | -- | Mount Barker | Dodge Truck | PL ● 33 | Plantagenet Road Board | 1925-26 |
| Mount Lawley Land & Estate Agency | - | 664 Beauford Street, Mount Lawley | Dodge | 761 | Metro Private Car | 1925-26 |
| Mount Lawley Land & Estate Agency | - | 664 Beaufort St | Dodge | 761 | Metro Private Car | 1926-27 |
| Mount Lawley Land & Estate Agency | - | 664 Beaufort Street | Dodge | 761 | Metro Private Car | 1927-28 |
| Mount Lyall Chemical Works | - | North Fremantle | Ford | 2764 | Metro Private Car | 1923-24 |
| Mount Marshall Road Board | - | Bencubbin | Overland | MM ● 45 | Mount Marshall Road Board | 1925-26 |
| Mount Marshall Road Board | - | Bencubbin | Overland | MM ● 45 | Mount Marshall Road Board | 1926-27 |
| Mount Marshall Road Board | - | Bencubbin | International Truck | MM ● 63 | Mount Marshall Road Board | 1927-28 |
