Serviceable Areas
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domestic
| Region | Province | City | Barangay | Zip code |
|---|---|---|---|---|
| Luzon | Isabela | Santiago City | Cabulay | 3311 |
| Luzon | Isabela | Santiago City | Calao East | 3311 |
| Luzon | Isabela | Santiago City | Calao West | 3311 |
| Luzon | Isabela | Santiago City | Calaocan | 3311 |
| Luzon | Isabela | Santiago City | Centro East | 3311 |
| Luzon | Isabela | Santiago City | Centro West | 3311 |
| Luzon | Isabela | Santiago City | Divisoria | 3311 |
| Luzon | Isabela | Santiago City | Dubinan East | 3311 |
| Luzon | Isabela | Santiago City | Dubinan West | 3311 |
| Luzon | Isabela | Santiago City | Luna | 3311 |
