Gagny Population and Area (Seine-Saint-Denis)
Largest city in France 2026: up-to-date figures for Gagny (Seine-Saint-Denis)
Gagny: Population and Area
With 42,524 inhabitants (INSEE total population in force on January 1, 2026), Gagny is the 185th most populous town in France in 2026 and the 19th most populous in the Seine-Saint-Denis department, out of 39 communes. It covers 6.83 km² (25,394th largest area in France, 13th largest in the department), with a population density of 6,226 inhabitants per km², or 57 times the national average (110 inhabitants/km²), which ranks it 97th in France for density.
Gagny is located in the Seine-Saint-Denis department (93), in the Île-de-France region, where it ranks 62nd by population out of 1,266 communes. The most populous town in the Seine-Saint-Denis department is Saint-Denis (149,936 inhabitants); the department is home to 1,710,659 people over 236 km².
See the full ranking of communes in the Seine-Saint-Denis department and the regional ranking: largest city in Île-de-France.
Towns of similar size in the Seine-Saint-Denis department: La Courneuve (pop. 47,285), Noisy-le-Sec (pop. 45,634), Bagnolet (pop. 43,234), Villepinte (pop. 41,579), Stains (pop. 41,471), Neuilly-sur-Marne (pop. 39,891).
Sources: INSEE, official population figures in force on January 1, 2026 (total population); areas: IGN / Observatoire des territoires; INSEE code 93032. Rankings are calculated across the 34,858 communes of metropolitan and overseas France in our database.