The canton Lavardac has 20 communes.
| Code | Name | Population ▼ |
|---|---|---|
| 47143 | Lavardac | 2 307 |
| 47021 | Barbaste | 1 488 |
| 47078 | Damazan | 1 358 |
| 47043 | Buzet-sur-Baïse | 1 245 |
| 47097 | Feugarolles | 1 015 |
| 47318 | Vianne | 979 |
| 47186 | Montesquieu | 733 |
| 47214 | Puch-d'Agenais | 718 |
| 47041 | Bruch | 688 |
| 47249 | Saint-Laurent | 431 |
| 47327 | Xaintrailles | 378 |
| 47251 | Saint-Léon | 329 |
| 47220 | Razimet | 309 |
| 47267 | Saint-Pierre-de-Buzet | 274 |
| 47308 | Thouars-sur-Garonne | 228 |
| 47207 | Pompiey | 224 |
| 47177 | Monheurt | 190 |
| 47250 | Saint-Léger | 177 |
| 47176 | Montgaillard-en-Albret | 167 |
| 47008 | Ambrus | 110 |