The canton Saint-Florentin has 22 communes.
| Code | Name | Population ▼ |
|---|---|---|
| 89345 | Saint-Florentin | 4 164 |
| 89201 | Héry | 1 784 |
| 89439 | Vergigny | 1 486 |
| 89382 | Seignelay | 1 476 |
| 89096 | Chemilly-sur-Yonne | 887 |
| 89276 | Neuvy-Sautour | 873 |
| 89268 | Mont-Saint-Sulpice | 781 |
| 89425 | Turny | 645 |
| 89282 | Ormoy | 638 |
| 89031 | Beaumont | 618 |
| 89069 | Chailley | 533 |
| 89186 | Germigny | 530 |
| 89101 | Chéu | 522 |
| 89205 | Jaulges | 418 |
| 89200 | Hauterive | 390 |
| 89398 | Sormery | 374 |
| 89474 | Villiers-Vineux | 288 |
| 89041 | Beugnon | 279 |
| 89061 | Butteaux | 264 |
| 89292 | Percey | 248 |
| 89402 | Soumaintrain | 211 |
| 89219 | Lasson | 141 |