Chilly-Mazarin Population and Area (Essonne)
Largest city in France 2026: up-to-date figures for Chilly-Mazarin (Essonne)
Chilly-Mazarin: Population and Area
With 20,539 inhabitants (INSEE total population in force on January 1, 2026), Chilly-Mazarin is the 480th most populous town in France in 2026 and the 23rd most populous in the Essonne department, out of 194 communes. It covers 5.57 km² (28,291st largest area in France, 140th largest in the department), with a population density of 3,687 inhabitants per km², or 34 times the national average (110 inhabitants/km²), which ranks it 223rd in France for density.
Chilly-Mazarin is located in the Essonne department (91), in the Île-de-France region, where it ranks 175th 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: Longjumeau (pop. 22,131), Saint-Michel-sur-Orge (pop. 21,901), Morsang-sur-Orge (pop. 21,850), Juvisy-sur-Orge (pop. 19,375), Orsay (pop. 16,869), Mennecy (pop. 16,691).
Sources: INSEE, official population figures in force on January 1, 2026 (total population); areas: IGN / Observatoire des territoires; INSEE code 91161. Rankings are calculated across the 34,858 communes of metropolitan and overseas France in our database.