The canton Mirande-Astarac has 43 communes.
| Code | Name | Population ▼ |
|---|---|---|
| 32256 | Mirande | 3 457 |
| 32252 | Miélan | 1 129 |
| 32464 | Villecomtal-sur-Arros | 831 |
| 32389 | Saint-Martin | 434 |
| 32045 | Berdoues | 424 |
| 32152 | Haget | 363 |
| 32254 | Miramont-d'Astarac | 357 |
| 32394 | Saint-Médard | 343 |
| 32167 | Laas | 310 |
| 32172 | Labéjan | 290 |
| 32283 | Montégut-Arros | 280 |
| 32020 | Aux-Aussat | 269 |
| 32397 | Saint-Michel | 252 |
| 32181 | Laguian-Mazous | 248 |
| 32373 | Sainte-Dode | 230 |
| 32156 | Idrac-Respaillès | 212 |
| 32104 | Clermont-Pouyguillès | 164 |
| 32177 | Lagarde-Hachan | 164 |
| 32126 | Estampes | 162 |
| 32215 | Loubersan | 162 |
| 32042 | Belloc-Saint-Clamens | 136 |
| 32393 | Saint-Maur | 135 |
| 32187 | Lamazère | 129 |
| 32263 | Moncassin | 123 |
| 32039 | Beccas | 122 |
| 32278 | Montaut | 122 |
| 32116 | Duffort | 121 |
| 32281 | Mont-de-Marrast | 106 |
| 32028 | Barcugnan | 104 |
| 32050 | Betplan | 104 |
| 32419 | Sauviac | 103 |
| 32225 | Malabat | 100 |
| 32323 | Ponsampère | 98 |
| 32401 | Saint-Ost | 95 |
| 32466 | Viozan | 92 |
| 32363 | Sainte-Aurence-Cazaux | 89 |
| 32415 | Sarraguzan | 88 |
| 32375 | Saint-Élix-Theux | 85 |
| 32226 | Manas-Bastanous | 82 |
| 32238 | Marseillan | 82 |
| 32355 | Sadeillan | 79 |
| 32086 | Castex | 75 |
| 32034 | Bazugues | 63 |