| Municipalities |
| Abulug, Cagayan |
| Alcala, Cagayan |
| Allacapan, Cagayan |
| Amulung, Cagayan |
| Aparri, Cagayan |
| Baggao, Cagayan |
| Ballesteros, Cagayan |
| Buguey, Cagayan |
| Calayan, Cagayan |
| Camalaniugan, Cagayan |
| Claveria, Cagayan |
| Enrile, Cagayan |
| Gattaran, Cagayan |
| Gonzaga, Cagayan |
| Iguig, Cagayan |
| Lal-lo, Cagayan |
| Lasam, Cagayan |
| Pamplona, Cagayan |
| Peñablanca, Cagayan |
| Piat, Cagayan |
| Rizal, Cagayan |
| Sanchez-Mira, Cagayan |
| Santa Ana, Cagayan |
| Santa Praxedes, Cagayan |
| Santa Teresita, Cagayan |
| Santo Niño, Cagayan |