| Locality | Post Code |
|---|---|
| López, San Jerónimo | S2255 |
| Maciel, San Jerónimo | S2209 |
| Monje, San Jerónimo | S2212 |
| Oroño, San Jerónimo | S2253 XAB |
| Puente Colastine, San Jerónimo | S2242 XAB |
| Puerto Aragón, San Jerónimo | S2246 XAA |
| Puerto Gaboto, San Jerónimo | S2208 XAA |
| Rigby, San Jerónimo | S2255 XAB |
| San Eugenio, San Jerónimo | S2256 |
| San Fabián, San Jerónimo | S2243 |
| San Genaro, San Jerónimo | S2146 |
| San Genaro Norte, San Jerónimo | S2147 |
| San Martín de Tours, San Jerónimo | S2255 XAC |
| Villa Biota, San Jerónimo | S2147 XAA |
| Villa Guastalla, San Jerónimo | S2148 XAA |