| Place | Post Code |
|---|---|
| Donkhoum, Viengkham | 10000 |
| Hattha, Viengkham | 10000 |
| Kaenghai, Viengkham | 10000 |
| Kaengnang, Viengkham | 10000 |
| Kokkieng, Viengkham | 10000 |
| Naxae, Viengkham | 10000 |
| Nayao, Viengkham | 10000 |
| Viengkeo, Viengkham | 10000 |
| Viengkham, Viengkham | 10000 |
| All postal codes in Keo Oudom | |
|---|---|
| Keokou, Keo Oudom | |
| Namgum, Keo Oudom | |
| Phongnaeng, Keo Oudom | |
| Thetsaban, Keo Oudom | |
| Viengkham, Keo Oudom | |