Castelnau-le-Lez Population and Area (Hérault)
Largest city in France 2026: up-to-date figures for Castelnau-le-Lez (Hérault)
Castelnau-le-Lez: Population and Area
With 26,449 inhabitants (INSEE total population in force on January 1, 2026), Castelnau-le-Lez is the 349th most populous town in France in 2026 and the 6th most populous in the Hérault department, out of 341 communes. It covers 11 km² (17,055th largest area in France, 204th largest in the department), with a population density of 2,366 inhabitants per km², or 22 times the national average (110 inhabitants/km²), which ranks it 382nd in France for density.
Castelnau-le-Lez is located in the Hérault department (34), in the Occitanie region (formerly Languedoc-Roussillon), where it ranks 20th by population out of 4,446 communes. The most populous town in the Hérault department is Montpellier (313,712 inhabitants); the department is home to 1,248,501 people over 6,101 km².
See the full ranking of communes in the Hérault department and the regional ranking: largest city in Occitanie.
Towns of similar size in the Hérault department: Sète (pop. 45,901), Agde (pop. 30,340), Lunel (pop. 26,923), Frontignan (pop. 24,383), Lattes (pop. 17,540), Mauguio (pop. 16,695).
Sources: INSEE, official population figures in force on January 1, 2026 (total population); areas: IGN / Observatoire des territoires; INSEE code 34057. Rankings are calculated across the 34,858 communes of metropolitan and overseas France in our database.