| Place | Post Code |
|---|---|
| Amuyong, Alfonso | 4123 |
| Barangay I, Alfonso | 4123 |
| Barangay II, Alfonso | 4123 |
| Barangay III, Alfonso | 4123 |
| Barangay IV, Alfonso | 4123 |
| Barangay V, Alfonso | 4123 |
| Bilog, Alfonso | 4123 |
| Buck Estate, Alfonso | 4123 |
| Esperanza Ibaba, Alfonso | 4123 |
| Esperanza Ilaya, Alfonso | 4123 |
| Kaysuyo, Alfonso | 4123 |
| Kaytitinga I, Alfonso | 4123 |
| Kaytitinga II, Alfonso | 4123 |
| Kaytitinga III, Alfonso | 4123 |
| Luksuhin, Alfonso | 4123 |
| Luksuhin Ilaya, Alfonso | 4123 |
| Mangas I, Alfonso | 4123 |
| Mangas II, Alfonso | 4123 |
| Marahan I, Alfonso | 4123 |
| Marahan II, Alfonso | 4123 |
| Matagbak I, Alfonso | 4123 |
| Matagbak II, Alfonso | 4123 |
| Pajo, Alfonso | 4123 |
| Palumlum, Alfonso | 4123 |
| Santa Teresa, Alfonso | 4123 |
| Sikat, Alfonso | 4123 |