| Place | Post Code |
|---|---|
| Chomcheo Kao, Phonxai | 02000 |
| Houay An, Phonxai | 02000 |
| Houayhong, Phonxai | 02000 |
| Houaymeune, Phonxai | 02000 |
| Naboua, Phonxai | 02000 |
| Phonxay, Phonxai | 02000 |
| Thenglong, Phonxai | 02000 |
| All postal codes in May | |
|---|---|
| Houaykop, May | |
| Kounglouk, May | |
| Nalam, May | |
| Namnga, May | |
| Pakphae, May | |
| Palan, May | |
| Phialo, May | |
| Phonxai, May | |
| Poungyang, May | |
| Sophoun, May | |