Serviceable Areas
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domestic
| Region | Province | City | Barangay | Zip code |
|---|---|---|---|---|
| Luzon | Isabela | San Mariano | Zone I | 3332 |
| Luzon | Isabela | San Mariano | Zone II | 3332 |
| Luzon | Isabela | San Mariano | Zone III | 3332 |
| Luzon | Isabela | San Mateo | Bacare | 3318 |
| Luzon | Isabela | San Mateo | Bagong Sikat | 3318 |
| Luzon | Isabela | San Mateo | Barangay I | 3318 |
| Luzon | Isabela | San Mateo | Barangay II | 3318 |
| Luzon | Isabela | San Mateo | Barangay III | 3318 |
| Luzon | Isabela | San Mateo | Barangay IV | 3318 |
| Luzon | Isabela | San Mateo | Bella Luz | 3318 |
