Arrondissements of the Bouches-du-Rhône department
The four arrondissements of the Bouches-du-Rhône department are:
 Arrondissement of Aix-en-Provence, (subprefecture: Aix-en-Provence) with 48 communes. The population of the arrondissement was 450,153 in 2016. Arrondissement of Arles, (subprefecture: Arles) with 29 communes. The population of the arrondissement was 171,684 in 2016. Arrondissement of Istres, (subprefecture: Istres) with 21 communes. The population of the arrondissement was 327,971 in 2016. Arrondissement of Marseille, (prefecture of the Bouches-du-Rhône department: Marseille) with 21 communes. The population of the arrondissement was 1,069,909 in 2016. History

In 1800 the arrondissements of Marseille, Aix and Tarascon were established. In 1817 Arles replaced Tarascon as subprefecture. The arrondissement of Istres was created in 1981. The borders of the arrondissements of Bouches-du-Rhône were modified in March 2017:
 two communes from the arrondissement of Aix-en-Provence to the arrondissement of Istres
 one commune from the arrondissement of Aix-en-Provence to the arrondissement of Marseille
 six communes from the arrondissement of Arles to the arrondissement of Aix-en-Provence
 two communes from the arrondissement of Arles to the arrondissement of Istres
 one commune from the arrondissement of Marseille to the arrondissement of Aix-en-Provence

References

Bouches-du-Rhone