The canton Redon has 15 communes.
| Code | Name | Population ▼ |
|---|---|---|
| 35236 | Redon | 9 542 |
| 35176 | Guipry-Messac | 7 354 |
| 35219 | Pipriac | 3 859 |
| 35013 | Bains-sur-Oust | 3 535 |
| 35328 | Sixt-sur-Aff | 2 273 |
| 35294 | Sainte-Marie | 2 247 |
| 35145 | Langon | 1 423 |
| 35064 | La Chapelle-de-Brain | 1 114 |
| 35285 | Saint-Just | 1 107 |
| 35289 | Saint-Malo-de-Phily | 1 081 |
| 35237 | Renac | 1 027 |
| 35045 | Bruc-sur-Aff | 855 |
| 35151 | Lieuron | 811 |
| 35155 | Lohéac | 702 |
| 35268 | Saint-Ganton | 413 |