| Place | Post Code |
|---|---|
| Anonang Mayor, Caoayan | 2702 |
| Anonang Menor, Caoayan | 2702 |
| Baggoc, Caoayan | 2702 |
| Callaguip, Caoayan | 2702 |
| Caparacadan, Caoayan | 2702 |
| Don Alejandro Quirolgico, Caoayan | 2702 |
| Don Dimas Querubin, Caoayan | 2702 |
| Don Lorenzo Querubin, Caoayan | 2702 |
| Fuerte, Caoayan | 2702 |
| Manangat, Caoayan | 2702 |
| Naguilian, Caoayan | 2702 |
| Nansuagao, Caoayan | 2702 |
| Pandan, Caoayan | 2702 |
| Pantay-Quitiquit, Caoayan | 2702 |
| Pantay Tamurong, Caoayan | 2702 |
| Puro, Caoayan | 2702 |
| Villamar, Caoayan | 2702 |