Saint-Gratien Population and Area (Val-d'Oise)
Largest city in France 2026: up-to-date figures for Saint-Gratien (Val-d'Oise)
Saint-Gratien Population
21,427 inhabitantsTOP #448
Saint-Gratien: Population and Area
With 21,427 inhabitants (INSEE total population in force on January 1, 2026), Saint-Gratien is the 448th most populous town in France in 2026 and the 21st most populous in the Val-d'Oise department, out of 183 communes. It covers 2.42 km² (34,075th largest area in France, 173rd largest in the department), with a population density of 8,854 inhabitants per km², or 81 times the national average (110 inhabitants/km²), which ranks it 54th in France for density.
Saint-Gratien is located in the Val-d'Oise department (95), in the Île-de-France region, where it ranks 163rd by population out of 1,266 communes. The most populous town in the Val-d'Oise department is Argenteuil (106,546 inhabitants); the department is home to 1,290,942 people over 1,246 km².
See the full ranking of communes in the Val-d'Oise department and the regional ranking: largest city in Île-de-France.
Towns of similar size in the Val-d'Oise department: Deuil-la-Barre (pop. 23,287), Montigny-lès-Cormeilles (pop. 22,555), Montmorency (pop. 21,993), Éragny-sur-Oise (pop. 18,573), Soisy-sous-Montmorency (pop. 18,148), Osny (pop. 18,107).
Sources: INSEE, official population figures in force on January 1, 2026 (total population); areas: IGN / Observatoire des territoires; INSEE code 95555. Rankings are calculated across the 34,858 communes of metropolitan and overseas France in our database.