Saint-Denis is a commune in the northern suburbs of Paris, France. It is located from the centre of Paris. Saint-Denis is the second most populated suburb of Paris (after Boulogne-Billancourt), with a population of 113,116 at the 2020 census. It is a subprefecture (French: sous-préfecture) 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.