| Place | Post Code |
|---|---|
| Houaykhang, Houaykhot | 06000 |
| Houaykhong, Houaykhot | 06000 |
| Houaykhot, Houaykhot | 06000 |
| Houayphaeng, Houaykhot | 06000 |
| Houaythao, Houaykhot | 06000 |
| Longsan, Houaykhot | 06000 |
| Nakha, Houaykhot | 06000 |
| Nam-Okhou, Houaykhot | 06000 |
| Nongkhouay, Houaykhot | 06000 |
| Pakveirk, Houaykhot | 06000 |
| Phonsavang, Houaykhot | 06000 |
| Saen-Oudom, Houaykhot | 06000 |
| Saenkoun, Houaykhot | 06000 |