| Clark | J. | Denmark | Chevrolet | DE ● 1 | Denmark Road Board | 1925-26 |
| Clark | J. | Yalgoo Hotel | Overland | YA ● 1 | Yalgoo Road Board | 1925-26 |
| Clark | J. | Yalgoo Hotel | Fiat | YA ● 3 | Yalgoo Road Board | 1925-26 |
| Clark | J. | Fields Find, Yalgoo | Overland | YA ● 79 | Yalgoo Road Board | 1925-26 |
| Clark | J. | Fields Find, Yalgoo | Overland | YA ● 79 | Yalgoo Road Board | 1926-27 |
| Clark | J. | Fields Find | Ford Truck | YA ● 90 | Yalgoo Road Board | 1927-28 |
| Clark | J. & Co. | Onslow | Ford Truck | AS ● 48 | Ashburton Road Board | 1924-25 |
| Clark | J. A. | Bunbury | Jewett | BY 126 | Bunbury Municipality | 1925-26 |
| Clark | J. A. | C/o Bushells 303 Beaufort Street, Perth | Bean Wagon | 3834 | Metro Hire or Trade | 1926-27 |
| Clark | J. B. | Wellington Street, Cottesloe Beach | Ford Wagon | 3279 | Metropolitan Hire and Trade Cars | 1923-24 |
| Clark | J. B. | Wellington Street, Cottesloe Beach | Ford Wagon | 3279 | Metro Private Car | 1924-25 |
| Clark | J. E. | Yalgoo Hotel | Hupmobile | YA ● 16 | Yalgoo Road Board | 1922-23 |
| Clark | J. E. | Yalgoo Motor, Garage | Overland | YA ● 1 | Yalgoo Road Board | 1926-27 |
| Clark | J. E. | Motor Garage, Yalgoo | IHC Truck | YA ● 83 | Yalgoo Road Board | 1926-27 |
| Clark | J. E. | Motor Garage, Yalgoo | I.H.C. Truck | YA ● 83 | Yalgoo Road Board | 1927-28 |
| Clark | J. E. | Yalgoo Motor Garage | Overland | YA ● 1 | Yalgoo Road Board | 1927-28 |
| Clark | J. G. | 31 Dudley Street, Maylands | Ford Wagon | 9865 | Metro Private Car | 1926-27 |
| Clark | J. G. | 31 Dudley Street, Maylands | Chevrolet | 13241 | Metro Private Car | 1926-27 |
| Clark | J. G. | 31 Dudley Street, Maylands | Essex | 13241 | Metro Private Car | 1927-28 |
| Clark | J. H. | - | Dodge | N ● 22 | Northam Road Board | 1927-28 |
| Clark | J. K. | Onslow | Ford | AS ● 31 | Ashburton Road Board | 1923-24 |
| Clark | J. K. | Onslow | Ford | AS ● 31 | Ashburton Road Board | 1924-25 |
| Clark | J. K. | Gleney | Ford | AS ● 31 | Ashburton Road Board | 1925-26 |
| Clark | J. K. | Glenroy | Dodge | AS ● 65 | Ashburton Road Board | 1925-26 |
| Clark | J. K. | Glenroy | Dodge | AS ● 31 | Ashburton Road Board | 1926-27 |
| Clark | J. K. | Glenroy | Dodge | AS ● 65 | Ashburton Road Board | 1926-27 |
| Clark | J. K. | Glenroy | Ford | AS ● 31 | Ashburton Road Board | 1927-28 |
| Clark | J. K. | Glenroy | Dodge | AS ● 65 | Ashburton Road Board | 1927-28 |
| Clark | J. M. | Bickley | Thornycroft | DR ● 63 | Darling Range Road Board | 1926-27 |
| Clark | J. M. | Bickley | Thornycroft | DR ● 63 | Darling Range Road Board | 1927-28 |
| Clark | J. P. | Mount Magnet | Triumph 3½ H.P. Motorcycle | MA ● 8 | Mount Magnet Road Board | 1922-23 |
| Clark | J. R. | 72 Central Avenue, Maylands | Ford | 5153 | Metro Private Car | 1925-26 |
| Clark | J. R. | 72 Central Avenue, Maylands | Ford Wagon | 8765 | Metro Private Car | 1926-27 |
| Clark | James | Victoria Avenue, Claremont | Car | CL ● 11 | Claremont Road Board | 1917-18 |
| Clark | James | Victoria Avenue | - | CL ● 11 | Claremont Road Board | 1919 |
| Clark | James | Onslow | Dodge | AS ● 32 | Ashburton Road Board | 1925-26 |
| Clark | James | Onslow | Ford | AS ● 57 | Ashburton Road Board | 1925-26 |
| Clark | James | Onslow | Chevrolet | AS ● 32 | Ashburton Road Board | 1926-27 |
| Clark | James | Onslow | Ford | AS ● 57 | Ashburton Road Board | 1926-27 |
| Clark | James | Onslow | | AS ● 32 | Ashburton Road Board | 1927-28 |
| Clark | James | Onslow | Ford | AS ● 57 | Ashburton Road Board | 1927-28 |
| Clark | John | Yalgoo Hotel | Overland 30 H.P. | YA ● 3 | Yalgoo Road Board | 1919 |
| Clark | John | Yalgoo Hotel | Overland 30 H.P. | YA ● 17 | Yalgoo Road Board | 1919 |
| Clark | John | Denmark | Ford | DE ● 1 | Denmark Road Board | 1922-23 |
| Clark | John | Yalgoo Hotel | Overland | YA ● 1 | Yalgoo Road Board | 1922-23 |
| Clark | John | Yalgoo Hotel | Fiat | YA ● 3 | Yalgoo Road Board | 1922-23 |
| Clark | John | Yalgoo Hotel | Overland | YA ● 1 | Yalgoo Road Board | 1923-24 |
| Clark | John | Yalgoo Hotel | Fiat | YA ● 3 | Yalgoo Road Board | 1923-24 |
| Clark | John | Denmark | Ford | DE ● 1 | Denmark Road Board | 1923-24 |
| Clark | John | Yalgoo | Overland | YA ● 1 | Yalgoo Road Board | 1924-25 |
