Cagayan Valley Area Codes
| Batanes | Basco | 78 |
| Cagayan Valley | Aparri, Ballesteros, Buguey, Camalaniugan, Claveria, Enrile, Gonzaga, Lal-lo, Sanchez-Mira, Solana, Tuguegarao | 78 |
| Isabela | Alicia, Aurora, Cabagan, Cabatuan, Cauayan, Echague, Ilagan, Isabela (Northern Province), Mallig, Roxas, San Manuel, San Mateo, San Miguel, Santiago, Tumauini | 78 |
| Nueva Vizcaya | Bagabag, Bambang, Bayombong, Quezon, Solano | 78 |
| Quirino | Cabarroguis | 78 |
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