| Municipalities |
|---|
| Egerkingen, Gäu |
| Härkingen, Gäu |
| Kestenholz, Gäu |
| Neuendorf, Gäu |
| Niederbuchsiten, Gäu |
| Oberbuchsiten, Gäu |
| Oensingen, Gäu |
| Wolfwil, Gäu |
| Codes postaux en Solothurn (Soleure) |
|---|
| Bucheggberg (Bucheggberg) |
| Dorneck (Dorneck) |
| Gäu (Gäu) |
| Gösgen (Gösgen) |
| Lebern (Lebern) |
| Olten (Olten) |
| Solothurn (Soleure) |
| Thal (Thal) |
| Thierstein (Thierstein) |
| Wasseramt (Wasseramt) |