Saint-Ouen-l'Aumône Population and Area (Val-d'Oise)
Largest city in France 2026: up-to-date figures for Saint-Ouen-l'Aumône (Val-d'Oise)
Saint-Ouen-l'Aumône Density
2,105 inhabitants/km²TOP #427
Saint-Ouen-l'Aumône: Population and Area
With 25,699 inhabitants (INSEE total population in force on January 1, 2026), Saint-Ouen-l'Aumône is the 361st most populous town in France in 2026 and the 17th most populous in the Val-d'Oise department, out of 183 communes. It covers 12 km² (15,525th largest area in France, 18th largest in the department), with a population density of 2,105 inhabitants per km², or 19 times the national average (110 inhabitants/km²), which ranks it 427th in France for density.
Saint-Ouen-l'Aumône is located in the Val-d'Oise department (95), in the Île-de-France region, where it ranks 136th 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: Cormeilles-en-Parisis (pop. 27,522), Sannois (pop. 27,266), Eaubonne (pop. 26,558), Deuil-la-Barre (pop. 23,287), Montigny-lès-Cormeilles (pop. 22,555), Montmorency (pop. 21,993).
Sources: INSEE, official population figures in force on January 1, 2026 (total population); areas: IGN / Observatoire des territoires; INSEE code 95572. Rankings are calculated across the 34,858 communes of metropolitan and overseas France in our database.