Bailly-Romainvilliers is a commune in the Seine-et-Marne department in the Île-de-France region in north-central France. The inhabitants of the town of Bailly-Romainvilliers are "Romainvillersois, Romainvillersoises."
Wikipedia https://en.wikipedia.org/wiki/Bailly-Romainvilliers
Coordinates 48°50'48.537" N 2°49'16.652" E
