The 3 arrondissements of the Isère department are:
Arrondissement of Grenoble, (prefecture of the Isère department: Grenoble) with 263 communes. The population of the arrondissement was 748,885 in 2021. Arrondissement of La Tour-du-Pin, (subprefecture: La Tour-du-Pin) with 136 communes. The population of the arrondissement was 315,625 in 2021. Arrondissement of Vienne, (subprefecture: Vienne) with 113 communes. The population of the arrondissement was 220,438 in 2021.
History
In 1800 the arrondissements of Grenoble, Saint-Marcellin, La Tour-du-Pin and Vienne were established. The arrondissement of Saint-Marcellin was disbanded in 1926.Historique de l'Isère
The borders of the arrondissements of Isère were modified in January 2017: 24 communes from the arrondissement of Grenoble to the arrondissement of Vienne one commune from the arrondissement of La Tour-du-Pin to the arrondissement of Vienne six communes from the arrondissement of Vienne to the arrondissement of La Tour-du-Pin
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