This department has 320 communes.
| Code | Name | Population |
|---|---|---|
| 42218 | Saint-Étienne | 173 136 |
| 42207 | Saint-Chamond | 35 646 |
| 42187 | Roanne | 35 409 |
| 42095 | Firminy | 17 060 |
| 42147 | Montbrison | 16 123 |
This department has 23 cantons.
| Code | Name | Central office |
|---|---|---|
| 4201 | Andrézieux-Bouthéon | Andrézieux-Bouthéon |
| 4202 | Boën-sur-Lignon | Boën-sur-Lignon |
| 4203 | Charlieu | Charlieu |
| 4204 | Le Coteau | Le Coteau |
| 4205 | Feurs | Feurs |
This department has 3 departmental arrondissements.
| Code | Name | Administrative seat |
|---|---|---|
| 421 | Montbrison | Montbrison |
| 422 | Roanne | Roanne |
| 423 | Saint-Étienne | Saint-Étienne |