The canton Plénée-Jugon has 11 communes.
| Code | Name | Population ▼ |
|---|---|---|
| 22046 | Le Mené | 6 556 |
| 22185 | Plénée-Jugon | 2 579 |
| 22084 | Jugon-les-Lacs | 2 541 |
| 22015 | Bréhand | 1 684 |
| 22175 | Plédéliac | 1 662 |
| 22193 | Plestan | 1 635 |
| 22345 | Trébry | 844 |
| 22341 | Tramain | 704 |
| 22296 | Saint-Glen | 664 |
| 22165 | Penguily | 617 |
| 22332 | Saint-Trimoël | 526 |