Île d'Oléron
The island was divided in two cantons: Canton du Château-d'Oléron and Canton de Saint-Pierre-d'Oléron, with 4 communes each. In 27 February 2014, the number of cantons was reduced and the two cantons of the island were combined to form only one: the Canton de l'Île d'Oléron, divided in 8 communes.