| Locality | Postal Code |
|---|---|
| Postal/ZIP Codes in Agua Blanca, Castro Barros | F5356 |
| Postal/ZIP Codes in Aguada, Castro Barros | F5301 XBB |
| Postal/ZIP Codes in Aminga, Castro Barros | F5301 |
| Postal/ZIP Codes in Anillaco, Castro Barros | F5330 |
| Postal/ZIP Codes in Anjullón, Castro Barros | F5303 |
| Postal/ZIP Codes in Chuquis, Castro Barros | F5306 |
| Postal/ZIP Codes in Ismiango, Castro Barros | F5301 XBC |
| Postal/ZIP Codes in Los Molinos, Castro Barros | F5328 AAA, F5328 ABA, F5328 … |
| Postal/ZIP Codes in Pinchas, Castro Barros | F5307 |
| Postal/ZIP Codes in San Pedro, Castro Barros | F5309 |
| Postal/ZIP Codes in Santa Cruz, Castro Barros | F5301 XBA |
| Postal/ZIP Codes in Santa Vera Cruz, Castro Barros | F5326 |