| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Houy Keo, Koup | 12000 |
| Postal/ZIP Codes in Keng, Koup | 12000 |
| Postal/ZIP Codes in Koub, Koup | 12000 |
| Postal/ZIP Codes in Mouang Neua, Koup | 12000 |
| Postal/ZIP Codes in Na Khoun, Koup | 12000 |
| Postal/ZIP Codes in Nam None, Koup | 12000 |
| Postal/ZIP Codes in Or, Koup | 12000 |
| Postal/ZIP Codes in Phon Yeng, Koup | 12000 |
| Postal/ZIP Codes in Tew, Koup | 12000 |
| Postal/ZIP Codes in Yang, Koup | 12000 |