| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Angostura, Mostazal | 2890000 |
| Postal/ZIP Codes in La Punta, Mostazal | 2890000 |
| Postal/ZIP Codes in O'Higgins De Pilai, Mostazal | 2890000 |
| Postal/ZIP Codes in Peuco, Mostazal | 2890000 |
| Postal/ZIP Codes in San Francisco De Mostazal, Mostazal | 2890000 |