| Place | Post Code |
|---|---|
| Bouakkhouay, Houay-ot | 06000 |
| Houay-Od, Houay-ot | 06000 |
| Houay-Oun, Houay-ot | 06000 |
| Houayhoom, Houay-ot | 06000 |
| Houaylern, Houay-ot | 06000 |
| Houaypha, Houay-ot | 06000 |
| Kangkhuang, Houay-ot | 06000 |
| Kokngiou, Houay-ot | 06000 |
| Phadangkhouay, Houay-ot | 06000 |
| Phapon, Houay-ot | 06000 |
| Phouloy, Houay-ot | 06000 |
| Yanang, Houay-ot | 06000 |
| All postal codes in Park Ou | |
|---|---|
| Hatkho, Park Ou | |
| Hatpang, Park Ou | |
| Houay-ot, Park Ou | |
| Nasavang, Park Ou | |
| Pak-Ou, Park Ou | |
| Pakchaek, Park Ou | |
| Phonsavang, Park Ou | |
| Somsanouk, Park Ou | |