| Place | Post Code |
|---|---|
| Hatxaikhoun, Muangkao | 10000 |
| Mouang Kao, Muangkao | 10000 |
| Nakheua, Muangkao | 10000 |
| Nanin, Muangkao | 10000 |
| Parkkayoung, Muangkao | 10000 |
| Veunsan, Muangkao | 10000 |
| All postal codes in Viengkham | |
|---|---|
| Donkouat, Viengkham | |
| Muangkao, Viengkham | |
| Phonmi, Viengkham | |