Communes du district
| Commune | NPA | Habitants |
|---|---|---|
| Aedermannsdorf | 4714 +3 | 593 |
| Balsthal | 4710 +1 | 6 560 |
| Herbetswil | 4715 +1 | 608 |
| Holderbank (SO) | 4718 +1 | 779 |
| Laupersdorf | 4712 +1 | 1 880 |
| Matzendorf | 4713 +1 | 1 409 |
| Mümliswil-Ramiswil | 4717 +3 | 2 481 |
| Welschenrohr-Gänsbrunnen | 4716 | 1 209 |