Avernes (French pronunciation: [avɛʁn] ) is a commune in the Val-d'Oise department in Île-de-France in northern France. On 1 January 2018, the former commune of Gadancourt was merged into Avernes.

Historical population

Year Pop. ±% p.a. 1793 667 —     1800 531 −3.21% 1806 555 +0.74% 1821 540 −0.18% 1831 536 −0.07% 1836 551 +0.55% 1841 511 −1.50% 1846 553 +1.59% 1851 564 +0.39% 1856 548 −0.57% 1861 538 −0.37% 1866 547 +0.33% 1872 519 −0.87% 1876 519 +0.00% 1881 513 −0.23% 1886 487 −1.03% 1891 507 +0.81% 1896 523 +0.62%	Year Pop. ±% p.a. 1901 533 +0.38% 1906 504 −1.11% 1911 485 −0.77% 1921 591 +2.00% 1926 597 +0.20% 1931 522 −2.65% 1936 483 −1.54% 1946 563 +1.54% 1954 596 +0.71% 1962 477 −2.75% 1968 491 +0.48% 1975 602 +2.95% 1982 715 +2.49% 1990 704 −0.19% 1999 776 +1.09% 2007 921 +2.16% 2012 909 −0.26% 2017 852 −1.29%
Source: EHESS and INSEE (1968-2017)

• Communes of the Val-d'Oise department

• Base Mérimée: Search for heritage in the commune, Ministère français de la Culture. (in French)
• Association of Mayors of the Val d'Oise (in French)