| Municipality | ZIP Code |
|---|---|
| Cauayan | 3305 |
| Location | Municipality | Province | Region | ZIP Code |
|---|---|---|---|---|
| Turayong | Cauayan | Isabela | Cagayan Valley | 3305 |
| Union | Cauayan | Isabela | Cagayan Valley | 3305 |
| Villa Concepcion | Cauayan | Isabela | Cagayan Valley | 3305 |
| Villaflor | Cauayan | Isabela | Cagayan Valley | 3305 |
| Villa Luna | Cauayan | Isabela | Cagayan Valley | 3305 |
