Les Ulis Population and Area (Essonne)
Largest city in France 2026: up-to-date figures for Les Ulis (Essonne)
Les Ulis: Population and Area
With 25,986 inhabitants (INSEE total population in force on January 1, 2026), Les Ulis is the 357th most populous town in France in 2026 and the 17th most populous in the Essonne department, out of 194 communes. It covers 5.18 km² (29,220th largest area in France, 147th largest in the department), with a population density of 5,017 inhabitants per km², or 46 times the national average (110 inhabitants/km²), which ranks it 139th in France for density.
Les Ulis is located in the Essonne department (91), in the Île-de-France region, where it ranks 134th by population out of 1,266 communes. The most populous town in the Essonne department is Évry-Courcouronnes (67,272 inhabitants); the department is home to 1,351,891 people over 1,804 km².
See the full ranking of communes in the Essonne department and the regional ranking: largest city in Île-de-France.
Towns of similar size in the Essonne department: Brétigny-sur-Orge (pop. 27,000), Grigny (pop. 26,888), Brunoy (pop. 26,090), Montgeron (pop. 24,316), Gif-sur-Yvette (pop. 23,077), Longjumeau (pop. 22,131).
Sources: INSEE, official population figures in force on January 1, 2026 (total population); areas: IGN / Observatoire des territoires; INSEE code 91692. Rankings are calculated across the 34,858 communes of metropolitan and overseas France in our database.