The canton Haute Lande Armagnac has 47 communes.
| Code | Name | Population ▼ |
|---|---|---|
| 40134 | Labouheyre | 2 906 |
| 40245 | Roquefort | 1 990 |
| 40102 | Gabarret | 1 283 |
| 40246 | Sabres | 1 213 |
| 40307 | Sore | 1 179 |
| 40288 | Sarbazan | 1 167 |
| 40267 | Saint-Justin | 1 008 |
| 40135 | Labrit | 842 |
| 40094 | Escource | 824 |
| 40056 | Brocas | 721 |
| 40131 | Labastide-d'Armagnac | 673 |
| 40167 | Luxey | 654 |
| 40218 | Parleboscq | 451 |
| 40085 | Commensacq | 440 |
| 40105 | Garein | 424 |
| 40081 | Cère | 420 |
| 40149 | Lencouacq | 378 |
| 40303 | Solférino | 374 |
| 40165 | Luglon | 373 |
| 40014 | Arue | 356 |
| 40087 | Créon-d'Armagnac | 331 |
| 40053 | Bourriot-Bergonce | 326 |
| 40262 | Saint-Gor | 308 |
| 40164 | Retjons | 301 |
| 40158 | Losse | 286 |
| 40319 | Trensacq | 284 |
| 40323 | Vert | 235 |
| 40058 | Cachen | 233 |
| 40170 | Maillères | 230 |
| 40327 | Vielle-Soubiran | 226 |
| 40093 | Escalans | 215 |
| 40297 | Le Sen | 215 |
| 40140 | Lagrange | 185 |
| 40064 | Canenx-et-Réaut | 179 |
| 40033 | Bélis | 166 |
| 40060 | Callen | 153 |
| 40124 | Herré | 143 |
| 40169 | Maillas | 125 |
| 40039 | Betbezer-d'Armagnac | 124 |
| 40265 | Saint-Julien-d'Armagnac | 108 |
| 40176 | Mauvezin-d'Armagnac | 105 |
| 40242 | Rimbez-et-Baudiets | 104 |
| 40096 | Estigarde | 100 |
| 40008 | Argelouse | 92 |
| 40161 | Lubbon | 85 |
| 40015 | Arx | 57 |
| 40030 | Baudignan | 50 |