| Locality | Post Code |
|---|---|
| Benítez, Chivilcoy | B6632 XAA |
| Chivilcoy, Chivilcoy | B6620, B6622 |
| Emilio Ayarza, Chivilcoy | B6628 XAF |
| Gorostiaga, Chivilcoy | B6632 XAB |
| Haras El Carmen, Chivilcoy | B6627 XAC |
| Henry Bell, Chivilcoy | B6621 XAC |
| Indacochea, Chivilcoy | B6623 XAA |
| La Carlota, Chivilcoy | B6628 XAG |
| La Dormilona, Chivilcoy | B6628 XAH |
| La Rica, Chivilcoy | B6623 XAB |
| Puente Batalla, Chivilcoy | B6620 XAA |
| Ramón Biaus, Chivilcoy | B6627 XAB |
| San Sebastián, Chivilcoy | B6623 XAC |
| Villa Moquehua, Chivilcoy | B6625 |