The canton Lavaur Cocagne has 23 communes.
| Code | Name | Population ▼ |
|---|---|---|
| 81140 | Lavaur | 10 965 |
| 81116 | Labastide-Saint-Georges | 2 002 |
| 81076 | Cuq-Toulza | 702 |
| 81159 | Massac-Séran | 523 |
| 81298 | Teulat | 495 |
| 81050 | Cambon-lès-Lavaur | 362 |
| 81157 | Marzens | 311 |
| 81173 | Montcabrier | 304 |
| 81179 | Montgey | 272 |
| 81324 | Viviers-lès-Lavaur | 268 |
| 81001 | Aguts | 238 |
| 81006 | Algans | 223 |
| 81025 | Belcastel | 216 |
| 81022 | Bannières | 210 |
| 81205 | Péchaudier | 183 |
| 81126 | Lacougotte-Cadoul | 173 |
| 81310 | Veilhes | 143 |
| 81229 | Roquevidal | 141 |
| 81318 | Villeneuve-lès-Lavaur | 139 |
| 81162 | Maurens-Scopont | 135 |
| 81214 | Puéchoursi | 114 |
| 81189 | Mouzens | 111 |
| 81127 | Lacroisille | 98 |