This department has 327 communes.
| Code | Name | Population |
|---|---|---|
| 40192 | Mont-de-Marsan | 31 592 |
| 40088 | Dax | 22 109 |
| 40046 | Biscarrosse | 15 836 |
| 40279 | Saint-Paul-lès-Dax | 14 481 |
| 40312 | Tarnos | 12 957 |
This department has 17 cantons.
| Code | Name | Central office |
|---|---|---|
| 4001 | Adour Armagnac | Aire-sur-l'Adour |
| 4002 | Chalosse Tursan | Hagetmau |
| 4003 | Côte d'Argent | Mimizan |
| 4004 | Coteau de Chalosse | Montfort-en-Chalosse |
| 4005 | Dax-1 | Dax |
This department has 2 departmental arrondissements.
| Code | Name | Administrative seat |
|---|---|---|
| 401 | Dax | Dax |
| 402 | Mont-de-Marsan | Mont-de-Marsan |