| Place | Post Code |
|---|---|
| Houaykhang, Pak-Ou | 06000 |
| Khok, Pak-Ou | 06000 |
| Khokkhamh, Pak-Ou | 06000 |
| Moklek, Pak-Ou | 06000 |
| Pak-Ou, Pak-Ou | 06000 |
| Phatao, Pak-Ou | 06000 |
| Xanghay, Pak-Ou | 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 | |