A small part of Orly International Airport lies on the territory of the commune of Chilly-Mazarin.

Inhabitants of Chilly-Mazarin are known as Chiroquois.

Chilly-Mazarin developed around a Roman villa named Cailliacum which evolved into Chailly then Chilly. The suffix -Mazarin was added in 1822 to distinguish it from other French villages named Chilly and refers to the Mazarinettes, the famed nieces of Cardinal Mazarin who, for several years, lived at a mansion in Chilly. The fourth niece, Hortense Mancini, pass down to her son the titles of Marquess of Chilly and Duke of Mazarin which were ultimately passed to the House of Grimaldi, reigning house of Monaco.

Historical population

Year Pop. ±% p.a. 1793 449 —     1800 435 −0.45% 1806 469 +1.26% 1821 369 −1.59% 1831 377 +0.21% 1836 353 −1.31% 1841 360 +0.39% 1846 332 −1.61% 1851 346 +0.83% 1856 344 −0.12% 1861 360 +0.91% 1866 371 +0.60% 1872 341 −1.40% 1876 397 +3.87% 1881 381 −0.82% 1886 412 +1.58% 1891 396 −0.79% 1896 456 +2.86%	Year Pop. ±% p.a. 1901 422 −1.54% 1906 429 +0.33% 1911 415 −0.66% 1921 398 −0.42% 1926 1,023 +20.78% 1931 1,507 +8.06% 1936 1,681 +2.21% 1946 1,697 +0.09% 1954 2,188 +3.23% 1962 3,411 +5.71% 1968 9,923 +19.48% 1975 16,236 +7.29% 1982 17,271 +0.89% 1990 16,939 −0.24% 1999 17,737 +0.51% 2007 18,577 +0.58% 2012 19,213 +0.68% 2017 20,181 +0.99%
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Source: EHESS and INSEE (1968-2017)

Chilly-Mazarin is served by Chilly-Mazarin station on Paris RER line C.

There are:

• Seven preschools (écoles maternelles): du Centre, du Château, Les Roseaux, Les Saules, Pasteur, and Pauline Kergomard
• Four elementary schools: du Château, Jean-de-la-Fontaine, Pasteur, and Pierre et Marie Curie

There is a junior high school, Collège les Dînes Chiens, which opened in 1968.

High schools in the area include:

• Lycée Marguerite-Yourcenar - Morangis
• Lycée Jacques-Prévert - Longjumeau
• Lycée des Métiers Jean-Perrin – Longjumeau

• Communes of the Essonne department

Wikimedia Commons has media related to Chilly-Mazarin.

• Official website (in French)
• Base Mérimée: Search for heritage in the commune, Ministère français de la Culture. (in French)
• Mayors of Essonne Association (in French)

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