| Locality | Post Code |
|---|---|
| San Jose, San Carlos | 91000 |
| San Pancho, San Carlos | 91000 |
| Santa Elena, San Carlos | 91000 |
| Santa Isabel, San Carlos | 91000 |
| Santa Julia, San Carlos | 91000 |
| Santa Rita, San Carlos | 91000 |
| Santo Domingo, San Carlos | 91000 |
| Vivienda Progresiva, San Carlos | 91000 |
| Río San Juan Postal Codes | |
|---|---|
| San Miguelito | San Juan del Norte |
| San Carlos | Morrito |
| El Castillo | El Almendro |