The canton of Dieppe-1 is an administrative division of the Seine-Maritime department, in northern France. It was created at the French canton reorganisation which came into effect in March 2015. Its seat is in Dieppe.Décret n° 2014-266 du 27 février 2014 portant délimitation des cantons dans le département de la Seine-Maritime

It consists of the following communes:

Ambrumesnil Aubermesnil-Beaumais Colmesnil-Manneville Dieppe (partly) Hautot-sur-Mer Longueil Martigny Offranville Ouville-la-Rivière Quiberville Rouxmesnil-Bouteilles Saint-Aubin-sur-Scie Saint-Denis-d'Aclon Sainte-Marguerite-sur-Mer Sauqueville Tourville-sur-Arques Varengeville-sur-Mer

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