Saint-Pol-sur-Mer is a former commune in the Nord department in northern France. Since 9 December 2010, it is part of the commune of Dunkirkā¦Saint-Pol-sur-Mer is a former commune in the Nord department in northern France. Since 9 December 2010, it is part of the commune of Dunkirk. In 2022 it had 20,346 inhabitants. It is the second-largest suburb of the city of Dunkirk, and is almost encircled by it.