Saint-Denis is a commune in the northern suburbs of Paris, France. It is located 9.4 kilometres from the centre of Paris. Saint-Denis is the most populated suburb of Paris, with a population of 149,077 as of 2023. It is a subprefecture of the department of Seine-Saint-Denis, being the seat of the arrondissement of Saint-Denis. It is also part of the Métropole du Grand Paris.