The 3 arrondissements of the Val-d'Oise department are:
Arrondissement of Argenteuil, (subprefecture: Argenteuil) with 17 communes. The population of the arrondissement was 425,515 in 2021. Arrondissement of Pontoise, (prefecture of the Val-d'Oise department: Pontoise) with 105 communes. The population of the arrondissement was 349,407 in 2021. Arrondissement of Sarcelles, (subprefecture: Sarcelles) with 62 communes. The population of the arrondissement was 481,685 in 2021.
History
As parts of the department Seine-et-Oise, the arrondissement of Pontoise was established in 1800, the arrondissement of Montmorency in 1962 and the arrondissement of Argenteuil in 1966.Ancien département : Seine-et-Oise In 1968 the department Val-d'Oise was created from part of the former department Seine-et-Oise, and the arrondissements of Pontoise, Argenteuil and Montmorency became part of it.Historique du Val-d'Oise In March 2000 Sarcelles replaced Montmorency as subprefecture.Décret n° 2000-186 du 3 mars 2000 portant transfert du chef-lieu de l'arrondissement de Montmorency à Sarcelles (Val-d'Oise)
The borders of the arrondissements of Val-d'Oise were modified in January 2017: 10 communes from the arrondissement of Pontoise to the arrondissement of Argenteuil two communes from the arrondissement of Pontoise to the arrondissement of Sarcelles one commune from the arrondissement of Sarcelles to the arrondissement of Pontoise
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