The canton Saint-Flour-1 has 24 communes.
| Code | Name | Population ▼ |
|---|---|---|
| 15187 | Saint-Flour | 6 391 |
| 15119 | Massiac | 1 796 |
| 15231 | Talizat | 592 |
| 15164 | Roffiac | 561 |
| 15004 | Andelat | 468 |
| 15055 | Coren | 445 |
| 15053 | Coltines | 427 |
| 15207 | Saint-Poncy | 339 |
| 15259 | Vieillespesse | 271 |
| 15127 | Molompize | 270 |
| 15069 | Ferrières-Saint-Mary | 235 |
| 15042 | La Chapelle-Laurent | 234 |
| 15203 | Saint-Mary-le-Plain | 188 |
| 15237 | Tiviers | 162 |
| 15022 | Bonnac | 158 |
| 15013 | Auriac-l'Église | 141 |
| 15130 | Montchamp | 137 |
| 15125 | Mentières | 121 |
| 15161 | Rézentières | 114 |
| 15097 | Lastic | 109 |
| 15098 | Laurie | 84 |
| 15126 | Molèdes | 77 |
| 15105 | Leyvaux | 37 |
| 15247 | Valjouze | 26 |