The canton Grands Lacs has 13 communes.
| Code | Name | Population ▼ |
|---|---|---|
| 40046 | Biscarrosse | 15 836 |
| 40217 | Parentis-en-Born | 7 586 |
| 40287 | Sanguinet | 4 741 |
| 40332 | Ychoux | 2 338 |
| 40227 | Pissos | 1 505 |
| 40257 | Sainte-Eulalie-en-Born | 1 443 |
| 40295 | Saugnac-et-Muret | 1 382 |
| 40108 | Gastes | 925 |
| 40200 | Moustey | 798 |
| 40163 | Lüe | 621 |
| 40156 | Liposthey | 603 |
| 40032 | Belhade | 227 |
| 40171 | Mano | 149 |