| Locality | Postal Code |
|---|---|
| San Andrés Osuna, Siquinalá | 05018 |
| Siquinalá, Siquinalá | 05004 |
| Postal Codes in Escuintla | |
|---|---|
| Tiquisate | Siquinalá |
| Santa Lucía Cotzumalguapa | San Vicente Pacaya |
| San José | Palín |
| Nueva Concepción | Masagua |
| La Gomera | La Democracia |
| Iztapa | Guanagazapa |
| Escuintla | |