Serviceable Areas
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domestic
| Region | Province | City | Barangay | Zip code |
|---|---|---|---|---|
| Luzon | Isabela | San Mariano | Bitabian | 3332 |
| Luzon | Isabela | San Mariano | Buyasan | 3332 |
| Luzon | Isabela | San Mariano | Cadsalan | 3332 |
| Luzon | Isabela | San Mariano | Casala | 3332 |
| Luzon | Isabela | San Mariano | Cataguing | 3332 |
| Luzon | Isabela | San Mariano | Daragutan East | 3332 |
| Luzon | Isabela | San Mariano | Daragutan West | 3332 |
| Luzon | Isabela | San Mariano | Del Pilar | 3332 |
| Luzon | Isabela | San Mariano | Dibuluan | 3332 |
| Luzon | Isabela | San Mariano | Dicamay | 3332 |
