Amphoe Wiang Sa is a amphoe of Changwat Nan.
Boundaries: Royal Thai Survey Department, OCHA ROAP (https://data.humdata.org/dataset/thailand-administrative-boundaries) via geoBoundaries, CC BY 3.0 IGO (https://creativecommons.org/licenses/by/3.0/igo/); boundaries modified
| Ai Na Lai | no seat recorded | 7 k |
| Chom Chan | no seat recorded | 4 k |
| Khueng | no seat recorded | 4 k |
| Klang Wiang | Wiang Sa | 10 k |
| Lai Nan | no seat recorded | 3 k |
| Mae Khaning | no seat recorded | 4 k |
| Mae Sa | no seat recorded | 3 k |
| Mae Sakhon | no seat recorded | 3 k |
| Na Lueang | no seat recorded | 3 k |
| Nam Muap | no seat recorded | 3 k |
| Nam Pua | no seat recorded | 4 k |
| Pong Sanuk | no seat recorded | 1 k |
| San | no seat recorded | 7 k |
| Sanna Nong Mai | no seat recorded | 2 k |
| Tan Chum | no seat recorded | 4 k |
| Thung Si Thong | no seat recorded | 3 k |
| Yap Hua Na | no seat recorded | 5 k |
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