| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Chomcheo Kao, Phonxai | 02000 |
| Postal/ZIP Codes in Houay An, Phonxai | 02000 |
| Postal/ZIP Codes in Houayhong, Phonxai | 02000 |
| Postal/ZIP Codes in Houaymeune, Phonxai | 02000 |
| Postal/ZIP Codes in Naboua, Phonxai | 02000 |
| Postal/ZIP Codes in Phonxay, Phonxai | 02000 |
| Postal/ZIP Codes in Thenglong, Phonxai | 02000 |