Herblay-sur-Seine Population and Area (Val-d'Oise)
Largest city in France 2026: up-to-date figures for Herblay-sur-Seine (Val-d'Oise)
Herblay-sur-Seine Density
2,515 inhabitants/km²TOP #359
Herblay-sur-Seine: Population and Area
With 32,044 inhabitants (INSEE total population in force on January 1, 2026), Herblay-sur-Seine is the 266th most populous town in France in 2026 and the 8th most populous in the Val-d'Oise department, out of 183 communes. It covers 13 km² (14,768th largest area in France, 15th largest in the department), with a population density of 2,515 inhabitants per km², or 23 times the national average (110 inhabitants/km²), which ranks it 359th in France for density.
Herblay-sur-Seine is located in the Val-d'Oise department (95), in the Île-de-France region, where it ranks 91st 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: Franconville (pop. 37,896), Bezons (pop. 36,551), Pontoise (pop. 32,475), Goussainville (pop. 31,413), Villiers-le-Bel (pop. 30,195), Ermont (pop. 29,691).
Sources: INSEE, official population figures in force on January 1, 2026 (total population); areas: IGN / Observatoire des territoires; INSEE code 95306. Rankings are calculated across the 34,858 communes of metropolitan and overseas France in our database.