| Locality | Post Code |
|---|---|
| 15 de Agosto, Arroyito | 011202 |
| Arroyito, Arroyito | 011203 |
| Arroyo de Oro, Arroyito | 011206 |
| Cañada San Juan, Arroyito | 011203 |
| Choferes del Chaco, Arroyito | 011203 |
| Cuero Fresco, Arroyito | 011201 |
| Nucleo 2, Arroyito | 011204 |
| Nucleo 3, Arroyito | 011205 |
| Nucleo 4, Arroyito | 011205 |
| Nucleo 5, Arroyito | 011204 |
| Nucleo 6, Arroyito | 011204 |
| Nucleo 7, Arroyito | 011202 |
| Paso Mbutu, Arroyito | 011203 |
| Primavera, Arroyito | 011206 |
| San Antonio 2, Arroyito | 011202 |
| San Blas, Arroyito | 011204 |
| Tacuara, Arroyito | 011202 |
| Concepción Postal Codes | |
|---|---|
| Yby Yaú | Sargento José Félix López |
| San Lázaro | San Carlos Del Apa |
| San Alfredo | Paso Barreto |
| Loreto | Horqueta |
| Concepción | Belén |
| Azotey | Arroyito |