Serviceable Areas
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domestic
| Region | Province | City | Barangay | Zip code |
|---|---|---|---|---|
| Luzon | Isabela | Santo Tomas | Ammugauan | 3327 |
| Luzon | Isabela | Santo Tomas | Antagan | 3327 |
| Luzon | Isabela | Santo Tomas | Bagabag | 3327 |
| Luzon | Isabela | Santo Tomas | Bagutari | 3327 |
| Luzon | Isabela | Santo Tomas | Balelleng | 3327 |
| Luzon | Isabela | Santo Tomas | Barumbong | 3327 |
| Luzon | Isabela | Santo Tomas | Biga Occidental | 3327 |
| Luzon | Isabela | Santo Tomas | Biga Oriental | 3327 |
| Luzon | Isabela | Santo Tomas | Bolinao-Culalabo | 3327 |
| Luzon | Isabela | Santo Tomas | Bubug | 3327 |
