The canton Pechbonnieu has 26 communes.
| Code | Name | Population ▼ |
|---|---|---|
| 31410 | Pechbonnieu | 4 922 |
| 31117 | Castelmaurou | 4 524 |
| 31573 | Verfeil | 3 954 |
| 31358 | Montastruc-la-Conseillère | 3 708 |
| 31364 | Montberon | 3 158 |
| 31273 | Lapeyrouse-Fossat | 3 043 |
| 31228 | Gragnague | 2 553 |
| 31484 | Saint-Geniès-Bellevue | 2 495 |
| 31462 | Rouffiac-Tolosan | 2 363 |
| 31497 | Saint-Loup-Cammas | 2 334 |
| 31252 | Labastide-Saint-Sernin | 1 925 |
| 31212 | Garidech | 1 893 |
| 31407 | Paulhac | 1 256 |
| 31383 | Montjoire | 1 243 |
| 31459 | Roquesérière | 942 |
| 31579 | Villariès | 921 |
| 31285 | Lavalette | 793 |
| 31038 | Azas | 675 |
| 31049 | Bazus | 603 |
| 31216 | Gémil | 483 |
| 31501 | Saint-Marcel-Paulel | 483 |
| 31215 | Gauré | 464 |
| 31489 | Saint-Jean-Lherm | 443 |
| 31388 | Montpitol | 335 |
| 31074 | Bonrepos-Riquet | 324 |
| 31511 | Saint-Pierre | 268 |