| Locality | Post Code |
|---|---|
| Arroyo, Capital | N3300 XAH |
| Barrio Don Santiago, Capital | N3312 |
| Don Horacio, Capital | N3300 XAI |
| El Reposo, Capital | N3300 XAJ |
| El Tropezón, Capital | N3300 XAK |
| Fachinal, Capital | N3300 XAP |
| Garupá, Capital | N3304 |
| Kilometro 595, Capital | N3300 XAD |
| La Milagrosa, Capital | N3300 XAE |
| La Rotonda, Capital | N3300 XAB |
| Las Vertientes, Capital | N3300 XAF |
| Miguel Lanús, Capital | N3310 |
| Posadas, Capital | N3300, N3301, N3303, N3305 |
| Puerto Luján, Capital | N3300 XAA |
| San Isidro, Capital | N3300 XBA |
| Villa Emilia, Capital | N3300 XAC |
| Villa Lanus, Capital | N3300 XBF |
| Villalonga, Capital | N3300 XBG |