Serviceable Areas
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domestic
| Region | Province | City | Barangay | Zip code |
|---|---|---|---|---|
| Luzon | Isabela | San Guillermo | Guam | 3308 |
| Luzon | Isabela | San Guillermo | Nakar | 3308 |
| Luzon | Isabela | San Guillermo | Palawan | 3308 |
| Luzon | Isabela | San Guillermo | Progreso | 3308 |
| Luzon | Isabela | San Guillermo | Rizal | 3308 |
| Luzon | Isabela | San Guillermo | San Francisco Norte | 3308 |
| Luzon | Isabela | San Guillermo | San Francisco Sur | 3308 |
| Luzon | Isabela | San Guillermo | San Mariano Norte | 3308 |
| Luzon | Isabela | San Guillermo | San Mariano Sur | 3308 |
| Luzon | Isabela | San Guillermo | San Rafael | 3308 |
