| Location | States or Territories | Abbreviation | Postcode |
|---|---|---|---|
| Icy Creek | Victoria | VIC | 3833 |
| Iguana Creek | Victoria | VIC | 3875 |
| Illabarook | Victoria | VIC | 3351 |
| Illawarra | Victoria | VIC | 3381 |
| Illowa | Victoria | VIC | 3282 |
| Indented Head | Victoria | VIC | 3223 |
| Indigo Valley | Victoria | VIC | 3688 |
| Inglewood | Victoria | VIC | 3517 |
| Ingliston | Victoria | VIC | 3342 |
| Inkerman | Victoria | VIC | 3472 |
| Invergordon | Victoria | VIC | 3636 |
| Inverleigh | Victoria | VIC | 3321 |
| Inverloch | Victoria | VIC | 3996 |
| Invermay | Victoria | VIC | 3352 |
| Invermay Park | Victoria | VIC | 3350 |
| Iona | Victoria | VIC | 3815 |
| Iraak | Victoria | VIC | 3494 |
| Irishtown | Victoria | VIC | 3451 |
| Ironbark | Victoria | VIC | 3550 |
| Irrewarra | Victoria | VIC | 3249 |
