The canton Couserans Ouest has 29 communes.
| Code | Name | Population ▼ |
|---|---|---|
| 09261 | Saint-Girons | 6 008 |
| 09214 | Moulis | 794 |
| 09119 | Eycheil | 522 |
| 09085 | Castillon-en-Couserans | 428 |
| 09111 | Engomer | 315 |
| 09062 | Bordes-Uchentein | 219 |
| 09035 | Balaguères | 196 |
| 09014 | Argein | 195 |
| 09290 | Sentein | 175 |
| 09095 | Cescau | 163 |
| 09219 | Orgibet | 162 |
| 09267 | Saint-Lary | 156 |
| 09026 | Audressein | 144 |
| 09017 | Arrien-en-Bethmale | 134 |
| 09059 | Bonac-Irazein | 126 |
| 09129 | Galey | 114 |
| 09055 | Bethmale | 108 |
| 09018 | Arrout | 92 |
| 09027 | Augirein | 80 |
| 09011 | Antras | 74 |
| 09141 | Illartein | 73 |
| 09201 | Montégut-en-Couserans | 70 |
| 09025 | Aucazein | 65 |
| 09034 | Balacet | 51 |
| 09069 | Buzan | 47 |
| 09279 | Salsein | 47 |
| 09335 | Villeneuve | 42 |
| 09263 | Saint-Jean-du-Castillonnais | 33 |
| 09297 | Sor | 29 |