Le Mesnil-Saint-Denis (French pronunciation: [lə menil sɛ̃ dəni] ) is a commune in the Yvelines department in the Île-de-France region in north-central France.

Historical population

Year Pop. ±% p.a. 1793 474 —     1800 529 +1.58% 1806 450 −2.66% 1821 491 +0.58% 1831 519 +0.56% 1836 503 −0.62% 1841 489 −0.56% 1846 534 +1.78% 1851 505 −1.11% 1856 445 −2.50% 1861 504 +2.52% 1866 491 −0.52% 1872 498 +0.24% 1876 518 +0.99% 1881 518 +0.00% 1886 536 +0.69% 1891 553 +0.63% 1896 657 +3.51%	Year Pop. ±% p.a. 1901 670 +0.39% 1906 650 −0.60% 1911 654 +0.12% 1921 623 −0.48% 1926 633 +0.32% 1931 758 +3.67% 1936 792 +0.88% 1946 1,046 +2.82% 1954 1,161 +1.31% 1962 1,727 +5.09% 1968 4,061 +15.32% 1975 5,381 +4.10% 1982 6,594 +2.95% 1990 6,528 −0.13% 1999 6,518 −0.02% 2007 6,622 +0.20% 2012 6,593 −0.09% 2017 6,789 +0.59%
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Source: EHESS and INSEE (1968-2017)

The commune has two public preschools, Maternelle de Champmesnil and Maternelle du Bois du Fay, as well as two public elementary schools, Élémentaire de Champmesnil and Élémentaire du Bois du Fay. It also hosts two junior high schools, the public Collège Philippe de Champaigne and the private Collège privé Saint Thérèse. Collège Philippe de Champaigne also serves residents of La Verrière.

• Hankensbüttel, Germany since 1983

• Communes of the Yvelines department

• Home page (in French)