Serviceable Areas
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domestic
| Region | Province | City | Barangay | Zip code |
|---|---|---|---|---|
| Luzon | Isabela | San Guillermo | Aringay | 3308 |
| Luzon | Isabela | San Guillermo | Burgos | 3308 |
| Luzon | Isabela | San Guillermo | Calaoagan | 3308 |
| Luzon | Isabela | San Guillermo | Centro 1 | 3308 |
| Luzon | Isabela | San Guillermo | Centro 2 | 3308 |
| Luzon | Isabela | San Guillermo | Colorado | 3308 |
| Luzon | Isabela | San Guillermo | Dietban | 3308 |
| Luzon | Isabela | San Guillermo | Dingading | 3308 |
| Luzon | Isabela | San Guillermo | Dipacamo | 3308 |
| Luzon | Isabela | San Guillermo | Estrella | 3308 |
