Leuilly-sous-Coucy is a commune located in the Aisne department in the Hauts-de-France region of northern France. Administratively, it is situated within the arrondissement of Laon and is part of the canton of Vic-sur-Aisne.
The commune is characterized by its rural landscape, covering an area of approximately 12.69 square kilometers (4.90 square miles). It is positioned geographically near the historic town of Coucy-le-Château-Auffrique, a location reflected in its name, as "sous-Coucy" translates to "under" or "near" Coucy. The surrounding terrain is primarily agricultural, typical of the Picardy plateau.
Historically, Leuilly-sous-Coucy was impacted by the military engagements of World War I. Situated in a region that saw heavy fighting, particularly near the Chemin des Dames and the Hindenburg Line, the village suffered significant damage during the conflict. Much of the local infrastructure was rebuilt during the interwar period.
Demographically, Leuilly-sous-Coucy is a small community. According to data provided by the National Institute of Statistics and Economic Studies (INSEE), the population has historically fluctuated within a range typical of small rural municipalities in the department. The local government consists of a mayor and a municipal council who oversee communal affairs and land management. The commune is also a member of the Communauté de communes Picardie des Châteaux, an intercommunal structure aimed at coordinating local development and public services.
