Serviceable Areas
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domestic
| Region | Province | City | Barangay | Zip code |
|---|---|---|---|---|
| Luzon | Ilocos Sur | San Ildefonso | Iboy | 2728 |
| Luzon | Ilocos Sur | San Ildefonso | Kinamantirisan | 2728 |
| Luzon | Ilocos Sur | San Ildefonso | Otol-Patac | 2728 |
| Luzon | Ilocos Sur | San Ildefonso | Poblacion East | 2728 |
| Luzon | Ilocos Sur | San Ildefonso | Poblacion West | 2728 |
| Luzon | Ilocos Sur | San Ildefonso | Sagneb | 2728 |
| Luzon | Ilocos Sur | San Ildefonso | Sagsagat | 2728 |
| Luzon | Ilocos Sur | San Juan | Asilang | 2731 |
| Luzon | Ilocos Sur | San Juan | Bacsil | 2731 |
| Luzon | Ilocos Sur | San Juan | Baliw | 2731 |
