| Place | Post Code |
|---|---|
| Azacruz, Cullhuas | 12420 |
| Casabamba, Cullhuas | 12420 |
| Chacapampa, Cullhuas | 12420 |
| Chuamba, Cullhuas | 12420 |
| Cullhuas, Cullhuas | 12420 |
| Huarisca, Cullhuas | 12420 |
| Ingahuasi, Cullhuas | 12420 |
| Paccha, Cullhuas | 12420 |
| Pampa Cruz, Cullhuas | 12420 |
| San Antonio de Pihuas, Cullhuas | 12420 |
| San Juan de Retama Centro, Cullhuas | 12420 |
| San Juan Leon de Retama Bajo, Cullhuas | 12420 |
| San Luis de Retama Alta, Cullhuas | 12420 |
| San Pedro de Pihuas, Cullhuas | 12420 |
| Santa Rosa de Potaca, Cullhuas | 12420 |
| Vista Mantaro, Cullhuas | 12420 |