Serviceable Areas
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domestic
| Region | Province | City | Barangay | Zip code |
|---|---|---|---|---|
| Luzon | Isabela | Echague | Cabugao | 3309 |
| Luzon | Isabela | Echague | Caniguing | 3309 |
| Luzon | Isabela | Echague | Carulay | 3309 |
| Luzon | Isabela | Echague | Castillo | 3309 |
| Luzon | Isabela | Echague | Dammang East | 3309 |
| Luzon | Isabela | Echague | Dammang West | 3309 |
| Luzon | Isabela | Echague | Diasan | 3309 |
| Luzon | Isabela | Echague | Dicaraoyan | 3309 |
| Luzon | Isabela | Echague | Dugayong | 3309 |
| Luzon | Isabela | Echague | Fugu | 3309 |
