Serviceable Areas
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domestic
| Region | Province | City | Barangay | Zip code |
|---|---|---|---|---|
| North Luzon | Isabela | Santiago City | Calaocan | 3311 |
| North Luzon | Isabela | Santiago City | Centro East (Pob.) | 3311 |
| North Luzon | Isabela | Santiago City | Centro West (Pob.) | 3311 |
| North Luzon | Isabela | Santiago City | Divisoria | 3311 |
| North Luzon | Isabela | Santiago City | Dubinan East | 3311 |
| North Luzon | Isabela | Santiago City | Dubinan West | 3311 |
| North Luzon | Isabela | Santiago City | Luna | 3311 |
| North Luzon | Isabela | Santiago City | Mabini | 3311 |
| North Luzon | Isabela | Santiago City | Malvar | 3311 |
| North Luzon | Isabela | Santiago City | Nabbuan | 3311 |
