| Place | Post Code |
|---|---|
| Amelup, Gnowangerup | 6338 |
| Borden, Gnowangerup | 6338 |
| Cowalellup, Gnowangerup | 6336 |
| Gnowangerup, Gnowangerup | 6335 |
| Jackitup, Gnowangerup | 6335 |
| Kebaringup, Gnowangerup | 6335 |
| Magitup, Gnowangerup | 6338 |
| Mills Lake, Gnowangerup | 6336 |
| Mindarabin, Gnowangerup | 6336 |
| Monjebup, Gnowangerup | 6338 |
| Nalyerlup, Gnowangerup | 6338 |
| North Stirlings, Gnowangerup | 6338 |
| Ongerup, Gnowangerup | 6336 |
| Pallinup, Gnowangerup | 6335 |
| Stirling Range National Park, Gnowangerup | 6338 |
| Toompup, Gnowangerup | 6336 |