| Place | Post Code |
|---|---|
| Buamlao, Longnamchan | 06000 |
| Buamxieng, Longnamchan | 06000 |
| Chok, Longnamchan | 06000 |
| Huay On, Longnamchan | 06000 |
| Huaymieng, Longnamchan | 06000 |
| Huaytham, Longnamchan | 06000 |
| Keuab, Longnamchan | 06000 |
| Khoksawaang, Longnamchan | 06000 |
| Phounangwaang B, Longnamchan | 06000 |
| Xam Or, Longnamchan | 06000 |