| Mackay | C. M. | Queenslea Drive, Claremont | - | C 87 | Claremont Municipality | 1919 |
| MacKay | C. M. | Grange Street, Claremont | Buick | 71 | Metro Private Car | 1926-27 |
| Mackay | Caroline | Queenslea Drive Claremont | Daimler | 334 | Metro Private Car | 1922-23 |
| Mackay | E. F. | Gosnells | Darracq | GS ● 34 | Gosnells Road Board | 1924-25 |
| Mackay | F. | Collie | Ford Charabanc | CM 117 | Collie Municipality | 1925-26 |
| Mackay | F. | Collie | Ford Charabane | CM 117 | Collie Municipality | 1926-27 |
| Mackay | H. D. | Crawley Baths | Columbia | 12951 | Metro Private Car | 1927-28 |
| Mackay | J. R. | 13 Francisco Street, South Fremantle | Overland | 9204 | Metro Private Car | 1927-28 |
| MacKay | J. S. | Fitzgerald Street | Chevrolet | N 72 | Northam Municipality | 1927-28 |
| Mackay | John S. | Nullagine | 20 H.P. | NG 1 | Nullagine Road Board | 1915 |
| Mackay | John S. | Roy Hill, Nullagine (Pastoralist) | Overland 20 H.P. | NU 3 | Nullagine Road Board | 1916 |
| Mackay | K. S. | Roebourne | Buick | R ● 20 | Roebourne Road Board | 1923-24 |
| Mackay | K. S. | Roebourne | Ford | R ● 30 | Roebourne Road Board | 1923-24 |
| Mackay | Mrs | Queensland Drive, Claremont | Car | C ● 87 | Claremont Municipality | 1917-18 |
| Mackay | Mrs C. M. | Queenslea Drive, Claremont | Buick | 71 | Metro Private Car | 1923-24 |
| Mackay | Mrs C. M. | Queenslea Drive Claremont | Buick | 71 | Metro Private Car | 1925-26 |
| Mackay | Mrs C. M. | Grange Street Claremont | Buick | 71 | Metro Private Car | 1926-27 |
| Mackay | S. P. | Perth | Wolseley 16-20 H.P. | P 668 | Perth Municipality | 1915 |
| Mackay | S. P. | Esplanade Hotel | Wolsley 20 H.P. | P 813 | Perth Municipality | 1916 |
| Mackay | S. P. | Buckland | Essex | N ● 20 | Northam Road Board | 1922-23 |
| MacKay | S. P. | Mundabullanganna Station | Ford | PH ● 11 | Port Hedland Road Board | 1922-23 |
| MacKay | S. P. | Mundabullangana Station | Ford | PH ● 11 | Port Hedland Road Board | 1923-24 |
| MacKay | T. F. | Hannan Street | Chevrolet | KMC 120 | Kalgoorlie Municipal Council | 1925-26 |
| Mackay & Co | - | 38-42 Monger Street, Perth | Ford Wagon | 9188 | Metro Private Car | 1925-26 |
| Mackay & Co | - | Monger Street, Perth | Ford Wagon | 6777 | Metro Private Car | 1925-26 |
| Mackay & Co | - | Monger Street, Perth | Ford Wagon | 4641 | Metro Private Car | 1926-27 |
| Mackay & Co | - | Monger Street, Perth | Ford Wagon | 6777 | Metro Private Car | 1926-27 |
| Mackay & Co | - | Monger Street, Perth | Ford Truck | 13995 | Metro Private Car | 1926-27 |
| Mackay & Co | - | 38-42 Monger Street, Perth | Ford Wagon | 9188 | Metro Private Car | 1926-27 |
| Mackay & Co | - | 38-42 Monger Street, Perth | Ford Wagon | 9421 | Metro Private Car | 1926-27 |
| MacKay & Co | - | Monger Street, Perth | Ford Wagon | 6777 | Metro Private Car | 1927-28 |
| Mackay & Co | - | 38-42 Mongar Street, Perth | Ford Wagon | 9188 | Metro Private Car | 1927-28 |
| Mackay & Co | - | 38-42 Monger Street, Perth | Ford Wagon | 9421 | Metro Private Car | 1927-28 |
| Mackay & Co | - | Monger Street, Perth | Ford Wagon | 4641 | Metro Private Car | 1927-28 |
| Mackay & Co | - | Monger Street, Perth | Ford Truck | 13995 | Metro Private Car | 1927-28 |
| Mackay Bros | - | Buckland | Ford | N ● 32 | Northam Road Board | 1922-23 |
| Mackay Bros | - | Buckland | Triumph Motorcycle | N ● 41 | Northam Road Board | 1922-23 |
| Mackay Bros | - | Wyola | Studebaker Truck | ME ● 294 | Meckering Road Board | 1926-27 |
| Mackay Bros. | - | Bucklands | Talbot 20 H.P. | N 20 | Northam Road Board | 1919 |
| Mackay Bros. | - | Bucklands | Ford Lorry 20 H.P. | N 32 | Northam Road Board | 1919 |
| Mackay Bros. | - | - | Triumph | N 41 | Northam Road Board | 1919 |
| Mackay Bros. | - | Buckland | Ford | N ● 32 | Northam Road Board | 1923-24 |
| Mackeney | T. J. | 6 Johnston Street | Ford | K ● 168 | Kalgoorlie Road Board | 1927-28 |
| Mackenstsock | J. | Mount Hawthorn | Dodge | 2438 | Metro Private Car | 1926-27 |
| Mackenzie | A. | Forbes & Lake Streets, Perth | Chrysler | 342 | Metro Private Car | 1927-28 |
| MacKenzie | D. | Hines Hill | Dodge | MD ● 211 | Merredin Road Board | 1926-27 |
| Mackenzie | Dr D. | 197 Murray Street, Perth | Essex | 11558 | Metro Private Car | 1926-27 |
| MacKenzie | F. C. | Hines Hill | Dodge | MD ● 69 | Merredin Road Board | 1925-26 |
| MacKenzie | F. C. | Hines Hill | Dodge | MD ● 69 | Merredin Road Board | 1926-27 |
| Mackenzie | J. T. C. | Broome | Dodge | BM ● 31 | Broome Road Board | 1926-27 |
