| Locality | Post Code |
|---|---|
| Gonghe, Shuangxi (共和里) | 227003, 227004, 227201, 227302 |
| Mudan, Shuangxi (牡丹里) | 227001, 227004, 227061 |
| Pinglin, Shuangxi (平林里) | 227002, 227004, 227062, 227301 |
| Sandiao, Shuangxi (三貂里) | 227001, 227061 |
| Sangang, Shuangxi (三港里) | 227001, 227061 |
| Shanglin, Shuangxi (上林里) | 227002, 227062, 227062 |
| Shuangxi, Shuangxi (雙溪里) | 227004 |
| Taiping, Shuangxi (泰平里) | 227003, 227062, 227063 |
| Waigan, Shuangxi (外柑里) | 227002, 227062 |
| Xinji, Shuangxi (新基里) | 227000 |
| Yuxing, Shuangxi (魚行里) | 227003, 227063, 227064 |
| Zhangyuan, Shuangxi (長源里) | 227061, 227062 |