| Place | Post Code |
|---|---|
| Bok, Oudomsouk | 17000 |
| Donphai, Oudomsouk | 17000 |
| Donsoung, Oudomsouk | 17000 |
| Hatphila, Oudomsouk | 17000 |
| Hatyao, Oudomsouk | 17000 |
| Hinsombat, Oudomsouk | 17000 |
| Mitsamphan, Oudomsouk | 17000 |
| Muang, Oudomsouk | 17000 |
| Oudom, Oudomsouk | 17000 |
| Oudomxai, Oudomsouk | 17000 |
| Somsanouk, Oudomsouk | 17000 |
| Tapark, Oudomsouk | 17000 |
| Tha-Ouan, Oudomsouk | 17000 |
| Thadeua, Oudomsouk | 17000 |
| Thahin, Oudomsouk | 17000 |
| Viengxai, Oudomsouk | 17000 |
| Vongxai, Oudomsouk | 17000 |
| All postal codes in Sanamxay | |
|---|---|
| Baengvilai, Sanamxay | |
| Hatxaysoung, Sanamxay | |
| Hinlat, Sanamxay | |
| Nonghin, Sanamxay | |
| Oudomsouk, Sanamxay | |
| Pakbo, Sanamxay | |
| Pouy, Sanamxay | |
| Sompoy, Sanamxay | |