| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Cachapoal, San Carlos | 3840000 |
| Postal/ZIP Codes in El Torreón, San Carlos | 3840000 |
| Postal/ZIP Codes in Las Arboledas, San Carlos | 3840000 |
| Postal/ZIP Codes in San Carlos, San Carlos | 3840000 |
| Postal/ZIP Codes in Villa Illinois, San Carlos | 3840000 |