Le Mesnil-Saint-Denis () is a commune in the Yvelines department in the Île-de-France region in north-central France. Demographics Schools The commune has two public preschools, Maternelle de Champmesnil and Maternelle du Bois du Fay, as well as two public elementary schools, Élémentaire de Champmesnil and Élémentaire du Bois du Fay. It also hosts two junior high schools, the public Collège Philippe de Champaigne and the private Collège privé Saint Thérèse. Collège Philippe de Champaigne also serves residents of La Verrière. Twin towns Hankensbüttel, Germany since 1983 See also Communes of the Yvelines department References External links Home page Communes of Yvelines