In 1800 the arrondissements of Auch, Condom, Lectoure, Lombez and Mirande were established. The arrondissements of Lectoure and Lombez were disbanded in 1926.[3]
The borders of the arrondissements of Gers were modified in January 2017:[4]
13 communes from the arrondissement of Auch to the arrondissement of Condom
21 communes from the arrondissement of Auch to the arrondissement of Mirande
nine communes from the arrondissement of Condom to the arrondissement of Auch
five communes from the arrondissement of Mirande to the arrondissement of Auch