On August 7, 1850, a part of the territory of Saint-Gratien was detached and merged with a part of the territory of Deuil-la-Barre, a part of the territory of Soisy-sous-Montmorency, and a part of the territory of Épinay-sur-Seine to create the commune of Enghien-les-Bains. On that occasion the commune of Saint-Gratien lost the scenic lake now known as the Lake of Enghien.

Historical population

Year Pop. ±% p.a. 1793 368 —     1800 424 +2.04% 1806 468 +1.66% 1821 380 −1.38% 1831 430 +1.24% 1836 487 +2.52% 1841 517 +1.20% 1846 568 +1.90% 1851 580 +0.42% 1856 720 +4.42% 1861 916 +4.93% 1866 1,046 +2.69% 1872 1,202 +2.34% 1876 1,241 +0.80% 1881 1,327 +1.35% 1886 1,656 +4.53% 1891 1,547 −1.35% 1896 1,632 +1.08%	Year Pop. ±% p.a. 1901 1,774 +1.68% 1906 2,091 +3.34% 1911 2,539 +3.96% 1921 3,307 +2.68% 1926 4,485 +6.28% 1931 5,702 +4.92% 1936 5,847 +0.50% 1946 6,100 +0.42% 1954 7,204 +2.10% 1962 9,248 +3.17% 1968 14,947 +8.33% 1975 20,338 +4.50% 1982 20,470 +0.09% 1990 19,338 −0.71% 1999 19,226 −0.06% 2007 20,588 +0.86% 2012 20,937 +0.34% 2017 20,682 −0.24%
Graphs are unavailable due to technical issues. Updates on reimplementing the Graph extension, which will be known as the Chart extension, can be found on Phabricator and on MediaWiki.org.
Source: EHESS and INSEE (1968-2017)

Saint-Gratien is served by Saint-Gratien station on Paris RER line and by the bus number 138 going to Paris — Porte de Clichy.

• Communes of the Val-d'Oise department

• Official website (in French)
• 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)

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