| Place | Post Code |
|---|---|
| Donekhong, Houaykong | 16000 |
| Huaychot, Houaykong | 16000 |
| Huaykong, Houaykong | 16000 |
| Keokhounmouang, Houaykong | 16000 |
| Laxa-In, Houaykong | 16000 |
| Namhaan, Houaykong | 16000 |
| Namleng, Houaykong | 16000 |
| Namtaan, Houaykong | 16000 |
| Namtieng, Houaykong | 16000 |
| Namtuad, Houaykong | 16000 |
| Nankhong, Houaykong | 16000 |
| Nong-E-Oi, Houaykong | 16000 |
| Nongphanuay, Houaykong | 16000 |
| Nongtheuam, Houaykong | 16000 |
| Oubpaxa, Houaykong | 16000 |
| Ta-Ote, Houaykong | 16000 |
| Tayikseua, Houaykong | 16000 |
| Thongyao, Houaykong | 16000 |
| Xenamnoi, Houaykong | 16000 |