Coulommiers is a commune located in the Seine-et-Marne department in the Île-de-France region of northern France. It is situated in the eastern part of the region, positioned within the historical territory of the Brie province.
The city serves as a local administrative and residential hub. While it maintains its own distinct identity as a commune, it is characterized by its proximity to the capital city of Paris and the surrounding rural landscapes typical of the French countryside.