| Place | Post Code |
|---|---|
| Dan, Houayhoy | 06000 |
| Houayhoy, Houayhoy | 06000 |
| Houaylong, Houayhoy | 06000 |
| Houayme, Houayhoy | 06000 |
| Namphak, Houayhoy | 06000 |
| Phatonglom, Houayhoy | 06000 |
| Sisaath, Houayhoy | 06000 |
| Thongkhang, Houayhoy | 06000 |
| All postal codes in Nan | |
|---|---|
| Houayhoy, Nan | |
| Khoktom, Nan | |
| Namuang, Nan | |
| Pakmon, Nan | |
| Pakneun, Nan | |
| Sibounhuang, Nan | |
| Sivilai, Nan | |
| Thali, Nan | |
| Thetsaban, Nan | |