| Place | Post Code |
|---|---|
| Khangnongluang, Thonghai | 09000 |
| Latngon, Thonghai | 09000 |
| Muangpha, Thonghai | 09000 |
| Nadee, Thonghai | 09000 |
| Naheuang, Thonghai | 09000 |
| Nahoi, Thonghai | 09000 |
| Nakhoun, Thonghai | 09000 |
| Namthuang, Thonghai | 09000 |
| Nathao, Thonghai | 09000 |
| Phoukeng, Thonghai | 09000 |
| Phouvieng, Thonghai | 09000 |
| Sang, Thonghai | 09000 |
| Viengkham, Thonghai | 09000 |