Serviceable Areas
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domestic
| Region | Province | City | Barangay | Zip code |
|---|---|---|---|---|
| Luzon | Isabela | Santiago City | Mabini | 3311 |
| Luzon | Isabela | Santiago City | Malvar | 3311 |
| Luzon | Isabela | Santiago City | Nabbuan | 3311 |
| Luzon | Isabela | Santiago City | Naggasican | 3311 |
| Luzon | Isabela | Santiago City | Patul | 3311 |
| Luzon | Isabela | Santiago City | Plaridel | 3311 |
| Luzon | Isabela | Santiago City | Rizal | 3311 |
| Luzon | Isabela | Santiago City | Rosario | 3311 |
| Luzon | Isabela | Santiago City | Sagana | 3311 |
| Luzon | Isabela | Santiago City | Salvador | 3311 |
