| Place | Post Code |
|---|---|
| Boungkeo, Sompoy | 17000 |
| Saenkeo, Sompoy | 17000 |
| Sompoi, Sompoy | 17000 |
| Tangao, Sompoy | 17000 |
| Vangvien, Sompoy | 17000 |
| All postal codes in Sanamxay | |
|---|---|
| Baengvilai, Sanamxay | |
| Hatxaysoung, Sanamxay | |
| Hinlat, Sanamxay | |
| Nonghin, Sanamxay | |
| Oudomsouk, Sanamxay | |
| Pakbo, Sanamxay | |
| Pouy, Sanamxay | |
| Sompoy, Sanamxay | |