Épinay-sur-Seine is a commune in the Seine-Saint-Denis department, in the northern suburbs of Paris, France. It is located 11.3 km from the …Épinay-sur-Seine is a commune in the Seine-Saint-Denis department, in the northern suburbs of Paris, France. It is located 11.3 km from the center of Paris. The church of Notre-Dame-des-Missions-du-cygne d'Enghien, designed by Paul Tournon, may be found in the commune.