JossignyJossigny is a commune in the Seine-et-Marne department in the Île-de-France region in north-central France. It is located in the Val de Bussy sector of Marne-la-Vallée. As of 2018, its population was 671.DemographicsInhabitants are called Jossignaciens.SchoolThe municipality has a single preschool and elementary school.