Communes du district
| Commune | NPA | Habitants |
|---|---|---|
| Boningen | 4618 +1 | 813 |
| Däniken | 4658 | 3 073 |
| Dulliken | 4657 +1 | 5 450 |
| Eppenberg-Wöschnau | 5012 | 340 |
| Fulenbach | 4629 | 1 821 |
| Gretzenbach | 5014 +1 | 2 789 |
| Gunzgen | 4617 +2 | 1 696 |
| Hägendorf | 4614 +2 | 5 299 |
| Kappel (SO) | 4616 +1 | 3 562 |
| Olten | 4600 +2 | 19 051 |
| Rickenbach (SO) | 4613 | 1 211 |
| Schönenwerd | 5012 | 5 337 |
| Starrkirch-Wil | 4656 +2 | 1 980 |
| Walterswil (SO) | 5746 | 772 |
| Wangen bei Olten | 4612 +1 | 5 532 |