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List of Towns, Ilocos Sur, Region I, Philippines
| Ilocos Sur Towns | Zip |
|---|---|
| Alilem | 2716 |
| Banayoyo | 2708 |
| 2727 | |
| Burgos | 2724 |
| Cabugao | 2732 |
| Candon | 2710 |
| Caoayan | 2702 |
| Cervantes | 2718 |
| Galimuyod | 2709 |
| Gregorio del Pilar | 2720 |
| Lidlida | 2723 |
| Magsingal | 2730 |
| Nagbukel | 2725 |
| Narvacan | 2704 |
| Quirino | 2721 |
| Salcedo | 2711 |
| San Emilio | 2722 |
| San Esteban | 2706 |
| San Ildefonso | 2728 |
| San Juan | 2731 |
| San Vicente | 2726 |
| Santa | 2703 |
| Santa Catalina | 2701 |
| Santa Cruz | 2713 |
| Santa Lucia | 2712 |
| Santa Maria | 2705 |
| Santiago | 2707 |
| Santo Domingo | 2729 |
| Sicay | 2719 |
| Sinait | 2733 |
| Sugpon | 2717 |
| Suyo | 2715 |
| Tagudin | 2714 |
| Vigan | 2700 |
