Parmain is a commune in the Val-d'Oise department in Île-de-France in northern France. L'Isle-Adam–Parmain station has rail connections t…Parmain is a commune in the Val-d'Oise department in Île-de-France in northern France. L'Isle-Adam–Parmain station has rail connections to Persan, Creil, Pontoise and Paris.