Serviceable Areas
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domestic
| Region | Province | City | Barangay | Zip code |
|---|---|---|---|---|
| Luzon | Isabela | Echague | Santa Ana | 3309 |
| Luzon | Isabela | Echague | Santa Cruz | 3309 |
| Luzon | Isabela | Echague | Santa Maria | 3309 |
| Luzon | Isabela | Echague | Santa Monica | 3309 |
| Luzon | Isabela | Echague | Santo Domingo | 3309 |
| Luzon | Isabela | Echague | Silauan Norte | 3309 |
| Luzon | Isabela | Echague | Silauan Sur | 3309 |
| Luzon | Isabela | Echague | Sinabbaran | 3309 |
| Luzon | Isabela | Echague | Soyung | 3309 |
| Luzon | Isabela | Echague | Taggappan | 3309 |
