Communes du district
| Commune | NPA | Habitants |
|---|---|---|
| Aarau | 5000 +2 | 22 710 |
| Biberstein | 5023 | 1 657 |
| Buchs (AG) | 5033 | 8 491 |
| Densbüren | 5026 +1 | 769 |
| Erlinsbach (AG) | 5018 +1 | 4 639 |
| Gränichen | 5722 +1 | 8 692 |
| Hirschthal | 5042 | 1 763 |
| Küttigen | 5024 +1 | 6 997 |
| Muhen | 5037 | 4 090 |
| Oberentfelden | 5036 | 8 946 |
| Suhr | 5034 +1 | 11 617 |
| Unterentfelden | 5035 | 4 550 |