| Locality | Postal Code |
|---|---|
| Postal/ZIP Codes in Piedra Ita Pucu, Mercedes | W3470 XAP |
| Postal/ZIP Codes in Rincón de Yaguary, Mercedes | W3460 XAZ |
| Postal/ZIP Codes in Rincón Tranquera General, Mercedes | W3470 XAQ |
| Postal/ZIP Codes in Salto Ita Jhase, Mercedes | W3470 XAR |
| Postal/ZIP Codes in San Carlos, Mercedes | W3472 XAA |
| Postal/ZIP Codes in San Eduardo, Mercedes | W3472 XAB |
| Postal/ZIP Codes in San Nicolás, Mercedes | W3472 XAC |
| Postal/ZIP Codes in Tacural, Mercedes | W3470 XAX |
| Postal/ZIP Codes in Tacural Mercedes, Mercedes | W3471 XAD |
| Postal/ZIP Codes in Tarangullo, Mercedes | W3472 XAH |
| Postal/ZIP Codes in Tatare, Mercedes | W3472 XAD |
| Postal/ZIP Codes in Uguay, Mercedes | W3471 XAE |
| Postal/ZIP Codes in Yuquerí, Mercedes | W3470 XAA |