The canton Trouy has 23 communes.
| Code | Name | Population ▼ |
|---|---|---|
| 18267 | Trouy | 4 055 |
| 18180 | Plaimpied-Givaudins | 2 101 |
| 18058 | Châteauneuf-sur-Cher | 1 360 |
| 18126 | Levet | 1 357 |
| 18273 | Venesmes | 782 |
| 18201 | Saint-Caprais | 747 |
| 18270 | Vallenay | 687 |
| 18218 | Saint-Just | 656 |
| 18254 | Soye-en-Septaine | 582 |
| 18008 | Arçay | 500 |
| 18248 | Senneçay | 443 |
| 18268 | Uzay-le-Venon | 414 |
| 18221 | Saint-Loup-des-Chaumes | 279 |
| 18006 | Annoix | 250 |
| 18288 | Vorly | 247 |
| 18129 | Lissay-Lochy | 231 |
| 18122 | Lapan | 229 |
| 18073 | Corquoy | 198 |
| 18046 | Chambon | 152 |
| 18063 | Chavannes | 151 |
| 18236 | Saint-Symphorien | 133 |
| 18250 | Serruelles | 66 |
| 18078 | Crézançay-sur-Cher | 61 |