ErmontâÂÂEaubonne is a railway station between Ermont and Eaubonne, in the department of Val-d'Oise, France. It is an interchange station for commuter traffic in the northwestern suburbs of Paris. It is situated on the railway from Paris to Pontoise, and branch lines towards Valmondois, Argenteuil and Saint-Ouen. With 23 million passengers per year (2024), it is the busiest station of Val-d'Oise.