| Parker | S. L. | - | Ford Truck | CU ● 19 | Upper Chapman Road Board | 1926-27 |
| Parker | Stanley | Northam | Ford 20 H.P. | N 27 | Northam Road Board | 1916 |
| Parker | T. | Northam | Ford 20 H.P. | N ● 27 | Northam Road Board | 1917-18 |
| Parker | T. | Northam | Studebaker 20 H.P. | N 27 | Northam Road Board | 1919 |
| Parker | T. | Kukerin | Ford | DU ● 86 | Dumbleyung Road Board | 1927-28 |
| Parker | T. D. | 54 Fairfield Street, Mount Hawthorn | Ford | 7315 | Metro Private Car | 1925-26 |
| Parker | T. D. | 51 Fairfield Street, Mount Hawthorn | Chevrolet | 7584 | Metro Private Car | 1925-26 |
| Parker | T. D. | 54 Fairfield Street, Mount Hawthorn | Ford | 7315 | Metro Private Car | 1926-27 |
| Parker | T. D. | 51 Fairfield Street, Mount Hawthorn | Chevrolet | 7584 | Metro Private Car | 1926-27 |
| Parker | T. J. | York | Ford | Y 34 | York Municipality | 1924-25 |
| Parker | T. J. | - | Chevrolet Truck | NGN 63 | Narrogin Municipality | 1926-27 |
| Parker | T. J. | Narrogin | Chevrolet Truck | NO ● 90 | Narrogin Road Board | 1926-27 |
| Parker | T. J. | Narrogin | Chevrolet Truck | NGN 63 | Narrogin Municipality | 1927-28 |
| Parker | V. S. | 79 Victoria Avenue, Claremont | Hupmobile | 5648 | Metro Private Car | 1927-28 |
| Parker | W. | Hamersley | Dodge | Y ● 178 | York Road Board | 1927-28 |
| Parker | W. | Hardy | Ford | Y ● 181 | York Road Board | 1927-28 |
| Parker | W. B. | Northam | Ford | N ● 74 | Northam Road Board | 1923-24 |
| Parker | W. C. | Narrogin | B.S.A. 4 H.P. | NA 21 | Narrogin Road Board | 1919 |
| Parker | W. C. | - | Republic Truck | NGN 91 | Narrogin Municipality | 1926-27 |
| Parker | W. C. | Narrogin | Republic Truck | NGN 91 | Narrogin Municipality | 1927-28 |
| Parker | W. G. | York | Ford | Y 29 | York Municipality | 1926-27 |
| Parker | W. G. | York | Ford | Y 34 | York Municipality | 1926-27 |
| Parker | W. G. | York | Ford | Y 29 | York Municipality | 1927-28 |
| Parker | Wm Geo | York | Ford | Y 29 | York Municipality | 1924-25 |
| Parker | Wm. Geo. | York | Overland | Y 29 | York Municipality | 1925-26 |
| Parker | Wm. B. | Fitzgerald Street | Ford | N 87 | Northam Municipality | 1924-25 |
| Parker & Co | - | Woodstock Station | Chevrolet | PH ● 1 | Port Hedland Road Board | 1926-27 |
| Parker & Co | -- | Woodstock Station | Chevrolet | PH ● 1 | Port Hedland Road Board | 1925-26 |
| Parker & Hersey | - | Cannington | International Wagon | 8630 | Metro Private Car | 1925-26 |
| Parker & Hersey | - | Cannington | International Wagon | 8630 | Metro Private Car | 1926-27 |
| Parker & Son | - | Fitzgerald Street | Dodge | N 18 | Northam Municipality | 1924-25 |
| Parker & Son | - | Fitzgerald Street | Dodge | N 73 | Northam Municipality | 1924-25 |
| Parker & Son | - | Fitzgerald Street | Dodge | N 85 | Northam Municipality | 1924-25 |
| Parker & Son | - | Fitzgerald Street | Dodge | N 1 | Northam Municipality | 1925-26 |
| Parker & Son | - | Fitzgerald Street | Dodge | N 18 | Northam Municipality | 1925-26 |
| Parker & Son | - | Fitzgerald Street | Dodge | N 27 | Northam Municipality | 1925-26 |
| Parker & Son | - | Fitzgerald Street | Dodge | N 85 | Northam Municipality | 1925-26 |
| Parker & Son | - | Fitzgerald Street | Dodge | N 1 | Northam Municipality | 1926-27 |
| Parker & Son | - | Fitzgerald Street | Dodge | N 18 | Northam Municipality | 1926-27 |
| Parker & Son | - | Fitzgerald Street | Dodge | N 27 | Northam Municipality | 1926-27 |
| Parker & Son | - | Fitzgerald Street | Dodge | N 1 | Northam Municipality | 1927-28 |
| Parker & Son | - | Fitzgerald Street | Dodge | N 18 | Northam Municipality | 1927-28 |
| Parker & Son | S. F. A. | Fitzgerald Street | Dodge | N 1 | Northam Municipality | 1924-25 |
| Parker & Spargo | - | Merredin | Chevrolet | MD ● 128 | Merredin Road Board | 1927-28 |
| Parker & Spargo | - | Kellerberrin | Dealers | KE ● 330 | Kellerberrin Road Board | 1927-28 |
| Parker Bros | - | Waroona | Chevrolet Truck | DK ● 30 | Drakesbrook Road Board | 1926-27 |
| Parker Bros | - | Waroona | Chevrolet Truck | DK ● 30 | Drakesbrook Road Board | 1927-28 |
| Parker Bros. | - | Carnamah | Ford Truck | CA ● 245 | Carnamah Road Board | 1927-28 |
| Parker Jones Group. | T. | 39 Peel Estate | Essex | RO ● 16 | Rockingham Road Board | 1926-27 |
| Parkes | F. H. | Kalamunda | J.A.P. | DR ● 4 | Darling Range Road Board | 1919 |
