| Inkpen | Roy | York | Chevrolet 19 H.P. | Y 3 | York Municipality | 1922-23 |
| Inkpen | Roy | York | Chevrolet 19 H.P. | Y 3 | York Municipality | 1923-24 |
| Inkpen | Roy | York | Chevrolet | Y 3 | York Municipality | 1924-25 |
| Inkpen | Roy | York | Chevrolet | Y 3 | York Municipality | 1925-26 |
| Inkpen | Roy | York | Chevrolet | Y 3 | York Municipality | 1926-27 |
| Inkpen | Roy | York | Chevrolet | Y 3 | York Municipality | 1927-28 |
| Inman | E. S. | Booralaming | Ford | D ● 126 | Dowerin Road Board | 1926-27 |
| Inman | E. S. | Booralaming | Ford | D ● 126 | Dowerin Road Board | 1927-28 |
| Inman | E. S. | Booralaming | Chevrolet Truck | D ● 207 | Dowerin Road Board | 1927-28 |
| Innes | A. M. | Chapman Road, Geraldton | Gray Truck | GN 68 | Geraldton Municipality | 1926-27 |
| Innes | James C. | Manager, Union Brewery | Little 14 H.P. | P 451 | Perth Municipality | 1916 |
| Innes | James C. | Manager, Union Brewery | Half Lorry | P 476 | Perth Municipality | 1916 |
| Innes | James C. | Manager, Union Brewery | Ford 15 H.P. | P 545 | Perth Municipality | 1916 |
| Innes | R. | 41 Amherst Road, West Midland | Ford Wagon | 3151 | Metropolitan Hire and Trade Cars | 1923-24 |
| Innes | R. | 41 Arnhurst Road, West Midland | Ford Wagon | 3151 | Metro Private Car | 1924-25 |
| Innes | R. | 41 Arnhurst Road, West Midland | Republic Wagon | 3151 | Metro Hire or Trade | 1925-26 |
| Innes | R. | 12 Frederick Street, Midland Junction | Commerce | 10206 | Metro Hire or Trade | 1926-27 |
| Innes | R. | 12 Frederick Street, Midland Junction | Republic | 3151 | Metro Hire or Trade | 1926-27 |
| Innes | R. | 12 Frederick Street, Midland Junction | Republic | 3151 | Metro Hire or Trade | 1927-28 |
| Innes | R. | 12 Frederick Street, Midland Junction | Commerce | 10206 | Metro Hire or Trade | 1927-28 |
| Ins. Office of Australia | - | Perth | Ford 20 H.P. | PG ● 12 | Peppermint Grove Road Board | 1917-18 |
| Insem | J. S. | Balbarrup | Ford Truck | WA ● 71 | Manjimup Road Board | 1925-26 |
| Insem | J. S. | Balbarrup | Ford Truck | WA ● 71 | Manjimup Road Board | 1926-27 |
| Insem | J. S. | Balbarrup | Ford Truck | WA ● 71 | Manjimup Road Board | 1927-28 |
| Inspec. Mach. Department | - | - | De Dion | P 576 | Perth Municipality | 1915 |
| Inspec. Mach. Department | - | - | De Dion | P 577 | Perth Municipality | 1915 |
| Inspec. Mach. Department | - | - | Darracq | P 578 | Perth Municipality | 1915 |
| Inspec. Mach. Department | - | - | Hurtu | P 579 | Perth Municipality | 1915 |
| Inspection of Machinery Department | - | - | De Deon | P 576 | Perth Municipality | 1916 |
| Inspection of Machinery Department | - | - | De Deon | P 577 | Perth Municipality | 1916 |
| Inspection of Machinery Department | - | - | Darracq | P 578 | Perth Municipality | 1916 |
| Inspection of Machinery Department | - | - | Hurtin | P 579 | Perth Municipality | 1916 |
| Inspection of Machinery Department | - | - | Ford | P 615 | Perth Municipality | 1916 |
| Inspection of Machinery Department | - | - | Ford 20 H.P. | P 750 | Perth Municipality | 1916 |
| Inspector of Mines | - | Leonora | Ford 20 H.P. | MG 6 | Mount Margaret Road Board | 1919 |
| Instone | F. | 171 Hill Street, Fremantle | Willys-Knight | 7070 | Metro Private Car | 1925-26 |
| Instone | F. | 171 Hill Street, Fremantle | Willys-Knight | 7070 | Metro Private Car | 1926-27 |
| Instone | F. | 171 Hill Street, Fremantle | Willys-Knight | 7070 | Metro Private Car | 1927-28 |
| Instone & Co | - | Essex Street, Fremantle | Overland | 6054 | Metro Private Car | 1924-25 |
| Instone & Co | - | Essex Street, Fremantle | Overland | 6054 | Metro Private Car | 1925-26 |
| Instone & Co | - | Essex Street, Fremantle | Overland | 6054 | Metro Private Car | 1926-27 |
| Instone & Co | - | Essex Street, Fremantle | Chevrolet | 7140 | Metro Private Car | 1927-28 |
| Instone & Co | - | Essex Fremantle Fremantle | Overland | 6054 | Metro Private Car | 1927-28 |
| Instone & Co | F. | Essex Street, Fremantle | Overland | 7140 | Metro Private Car | 1925-26 |
| Insurance Office Aust. | - | Perth | Ford 20 H.P. | Ce ● 52 | Cuballing Road Board | 1917-18 |
| Insurance Office of Aust | - | Saint George's Terrace | Chevrolet | 13612 | Metro Private Car | 1927-28 |
| Insurance Office of Aust. | - | Saint George's Terrace, Perth | Ford | 1172 | Metro Private Car | 1922-23 |
| Insurance Office of Aust. | - | Saint George's Terrace | Chevrolet | 13612 | Metro Private Car | 1926-27 |
| Insurance Office of Australia | - | Perth | Ford 24 H.P. | Ce 52 | Cottesloe Municipality | 1916 |
| Insurance Office of Australia | - | Perth | Ford 20 H.P. | PG 12 | Peppermint Grove Road Board | 1919 |
