The canton La Montagne d'Alaric has 29 communes.
| Code | Name | Population ▼ |
|---|---|---|
| 11397 | Trèbes | 5 361 |
| 11068 | Capendu | 1 453 |
| 11037 | Berriac | 979 |
| 11027 | Barbaira | 805 |
| 11122 | Douzens | 784 |
| 11023 | Badens | 749 |
| 11251 | Val-de-Dagne | 731 |
| 11261 | Moux | 719 |
| 11220 | Marseillette | 697 |
| 11151 | Fontiès-d'Aude | 560 |
| 11146 | Floure | 405 |
| 11337 | Saint-Couat-d'Aude | 387 |
| 11422 | Villedubert | 349 |
| 11095 | Comigne | 328 |
| 11042 | Blomac | 264 |
| 11257 | Monze | 243 |
| 11043 | Bouilhonnac | 226 |
| 11378 | Serviès-en-Val | 221 |
| 11318 | Roquecourbe-Minervois | 150 |
| 11387 | Taurize | 108 |
| 11179 | Labastide-en-Val | 88 |
| 11314 | Rieux-en-Val | 84 |
| 11016 | Arquettes-en-Val | 83 |
| 11248 | Montirat | 70 |
| 11083 | Caunettes-en-Val | 56 |
| 11133 | Fajac-en-Val | 54 |
| 11227 | Mayronnes | 42 |
| 11440 | Villetritouls | 34 |
| 11414 | Villar-en-Val | 23 |