| Lieu | Code postal |
|---|---|
| Chaeng, Houayhok | 04000 |
| Chongnang, Houayhok | 04000 |
| Chormxai, Houayhok | 04000 |
| Hai, Houayhok | 04000 |
| Huayhok, Houayhok | 04000 |
| Kornlouk, Houayhok | 04000 |
| Langching, Houayhok | 04000 |
| Mokkachork, Houayhok | 04000 |
| Mongkham, Houayhok | 04000 |
| Phangaamnoi, Houayhok | 04000 |
| Phayam, Houayhok | 04000 |
| Phouthong, Houayhok | 04000 |