| Place | Post Code |
|---|---|
| Aschau, Birkfeld | 8190, 8191 |
| Birkfeld, Birkfeld | 8190 |
| Gschaid bei Birkfeld, Birkfeld | 8190 |
| Haslau bei Birkfeld, Birkfeld | 8172, 8190, 8190 |
| Piregg, Birkfeld | 8190 |
| Rabendorf, Birkfeld | 8190, 8191 |
| Rossegg, Birkfeld | 8172, 8184, 8191 |
| Sallegg, Birkfeld | 8172, 8190, 8191 |
| Waisenegg, Birkfeld | 8190 |