 In effect, from 1973, Sainte-Marie-sur-Mer possessed a status of associated commune with Pornic and removed the deputy mayor of Sainte-Marie, Jean-François Cossé who had opposed the amalgamation of the two communes.On July 1, 2007, after the acceptance by the prefect of the amalgamation of the communes of Pornic and Sainte-Marie-sur-Mer, the latter lost its status as associated commune and became a subdivision of Pornic .After the amalgamation with the town of Pornic, Sainte-Marie-sur-Mer and the aforementioned Pornic came to represent a single electoral zone.