Serviceable Areas
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domestic
| Region | Province | City | Barangay | Zip code |
|---|---|---|---|---|
| North Luzon | Ilocos Sur | Santa Catalina | Cabuloan | 2701 |
| North Luzon | Ilocos Sur | Santa Catalina | Pangada | 2701 |
| North Luzon | Ilocos Sur | Santa Catalina | Paratong | 2701 |
| North Luzon | Ilocos Sur | Santa Catalina | Poblacion | 2701 |
| North Luzon | Ilocos Sur | Santa Catalina | Sinabaan | 2701 |
| North Luzon | Ilocos Sur | Santa Catalina | Subec | 2701 |
| North Luzon | Ilocos Sur | Santa Catalina | Tamorong | 2701 |
| North Luzon | Ilocos Sur | Suyo | Poblacion (Kimpusa) | 2715 |
| North Luzon | Ilocos Sur | Vigan City | Ayusan Norte | 2700 |
| North Luzon | Ilocos Sur | Vigan City | Ayusan Sur | 2700 |
