| Locality | Postal Code |
|---|---|
| Postal/ZIP Codes in Puesto Nuevo, Capital | G4203 XAB |
| Postal/ZIP Codes in Quebracho Herrado, Capital | G4206 XBZ |
| Postal/ZIP Codes in Remes, Capital | G4203 XAC |
| Postal/ZIP Codes in San Isidro, Capital | G4206 XCN |
| Postal/ZIP Codes in San Lorenzo, Capital | G4203 XAD |
| Postal/ZIP Codes in Santa María, Capital | G4206 XCC |
| Postal/ZIP Codes in Santa Rosa, Capital | G4205 XAA |
| Postal/ZIP Codes in Santa Rosa Arraga, Capital | G4206 XCA |
| Postal/ZIP Codes in Santiago del Estero, Capital | G4200, G4202, G4204 |
| Postal/ZIP Codes in Tala Pozo, Capital | G4200 XAE |
| Postal/ZIP Codes in Upianita, Capital | G4200 XAF |
| Postal/ZIP Codes in Villa Constantina, Capital | G4200 XAJ |
| Postal/ZIP Codes in Villa de La Barranca, Capital | G4206 XCO |
| Postal/ZIP Codes in Villa Grimanesa, Capital | G4200 XAK |
| Postal/ZIP Codes in Villa Zanjon, Capital | G4206 XCP |