Serviceable Areas
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domestic
| Region | Province | City | Barangay | Zip code |
|---|---|---|---|---|
| Luzon | Ilocos Sur | Caoayan | Don Alejandro Quirolgico | 2702 |
| Luzon | Ilocos Sur | Caoayan | Don Dimas Querubin | 2702 |
| Luzon | Ilocos Sur | Caoayan | Don Lorenzo Querubin | 2702 |
| Luzon | Ilocos Sur | Caoayan | Fuerte | 2702 |
| Luzon | Ilocos Sur | Caoayan | Manangat | 2702 |
| Luzon | Ilocos Sur | Caoayan | Naguilian | 2702 |
| Luzon | Ilocos Sur | Caoayan | Nansuagao | 2702 |
| Luzon | Ilocos Sur | Caoayan | Pandan | 2702 |
| Luzon | Ilocos Sur | Caoayan | Pantay Tamurong | 2702 |
| Luzon | Ilocos Sur | Caoayan | Pantay-Quitiquit | 2702 |
