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