Mont-de-Marsan Population and Area (Landes)
Largest city in France 2026: up-to-date figures for Mont-de-Marsan (Landes)
Mont-de-Marsan: Population and Area
With 32,981 inhabitants (INSEE total population in force on January 1, 2026), Mont-de-Marsan is the 255th most populous town in France in 2026 and the most populous in the Landes department, out of 327 communes. It covers 37 km² (2,491st largest area in France, 71st largest in the department), with a population density of 894 inhabitants per km², or 8.2 times the national average (110 inhabitants/km²), which ranks it 1,064th in France for density.
Mont-de-Marsan is located in the Landes department (40), in the Nouvelle-Aquitaine region (formerly Aquitaine), where it ranks 17th by population out of 4,293 communes. It is the most populous town in the Landes department, which is home to 445,828 people over 9,243 km².
See the full ranking of communes in the Landes department and the regional ranking: largest city in Nouvelle-Aquitaine.
Towns of similar size in the Landes department: Dax (pop. 22,972), Biscarrosse (pop. 16,203), Saint-Paul-lès-Dax (pop. 14,981).
Sources: INSEE, official population figures in force on January 1, 2026 (total population); areas: IGN / Observatoire des territoires; INSEE code 40192. Rankings are calculated across the 34,858 communes of metropolitan and overseas France in our database.