| Location | States or Territories | Abbreviation | Postcode |
|---|---|---|---|
| Jitarning | Western Australia | WA | 6365 |
| Jolimont | Western Australia | WA | 6014 |
| Joondalup | Western Australia | WA | 6027 |
| Joondalup Delivery Centre | Western Australia | WA | 6027 |
| Joondalup Delivery Centre, PO Boxes | Western Australia | WA | 6919 |
| Joondanna | Western Australia | WA | 6060 |
| Julimar | Western Australia | WA | 6567 |
| Juna Downs | Western Australia | WA | 6751 |
| Jurien Bay | Western Australia | WA | 6516 |
