The Canton of Aix-en-Provence-IV or Aix-en-Provence-Sud-Ouest is a former canton in the Bouches-du-Rhônedepartment of France. It was created 27 February 2003 by the decree 2003-156.[1] It was disbanded following the French canton reorganisation which came into effect in March 2015. At 70,749 inhabitants (2012), it was the most populous canton in France.[2]