| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Dongmakphay, Mongkhai | 13000 |
| Postal/ZIP Codes in Dorntoum, Mongkhai | 13000 |
| Postal/ZIP Codes in Muangkhay Nua, Mongkhai | 13000 |
| Postal/ZIP Codes in Muangkhay Tai, Mongkhai | 13000 |
| Postal/ZIP Codes in Sisavang, Mongkhai | 13000 |