The commune of Saint-Pol-sur-Mer was created in 1877, by its territory being detached from Petite-Synthe. In 1972 the commune of Dunkerque absorbed Petite-Synthe and Rosendaël. In 1980, a large part of Petite-Synthe was detached from Dunkerque and merged into Grande-Synthe.
|The arms of Petite-Synthe are blazoned :
Argent, a cross moline gules between 4 bells sable.
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