Ermont

Ermont
Commune
The church of Saint-Flaive, in Ermont
Coat of arms
Location (in red) within Paris inner and outer suburbs
Location of Ermont
Ermont Show map of France Ermont Show map of Île-de-France (region)
Coordinates: 48°59′32″N 2°15′37″E / 48.9922°N 2.2603°E / 48.9922; 2.2603
Country	France
Region	Île-de-France
Department	Val-d'Oise
Arrondissement	Argenteuil
Canton	Ermont
Intercommunality	CA Val Parisis
Government
• Mayor (2020–2026)	Xavier Haquin1
Area 1	4.16 km2 (1.61 sq mi)
Population  (2023)2	29,489
• Density	7,090/km2 (18,400/sq mi)
Demonym	Ermontois·e
Time zone	UTC+01:00 (CET)
• Summer (DST)	UTC+02:00 (CEST)
INSEE/Postal code	95219 /95120
Elevation	43–65 m (141–213 ft)
1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries.

Ermont (French pronunciation: [ɛʁmɔ̃] ^ⓘ) is a commune in the Val-d'Oise department, in the northern suburbs of Paris, France. It is located 17.2 km (10.7 mi) from the center of Paris. It has around 29,000 inhabitants, which makes Ermont one of the most important cities in Val d'Oise. Ermont has experienced rapid urbanization thanks to railway transport and industrialization, with the population of Ermont being just 9,000 after the Second World War.

The Hôtel de Ville was built as a private residence and completed in 1868.³

Historical population
Year Pop. ±% p.a. 1793 518 —     1800 513 −0.14% 1806 574 +1.89% 1821 506 −0.84% 1831 580 +1.37% 1836 548 −1.13% 1841 522 −0.97% 1846 582 +2.20% 1851 587 +0.17% 1856 643 +1.84% 1861 647 +0.12% 1866 792 +4.13% 1872 1,065 +5.06% 1876 1,106 +0.95% 1881 1,320 +3.60% 1886 1,609 +4.04% 1891 1,683 +0.90% 1896 2,304 +6.48% 1901 3,101 +6.12%	Year Pop. ±% p.a. 1906 3,717 +3.69% 1911 4,647 +4.57% 1921 5,658 +1.99% 1926 7,110 +4.67% 1931 8,316 +3.18% 1936 8,812 +1.17% 1946 9,325 +0.57% 1954 11,068 +2.17% 1962 19,263 +7.17% 1968 23,842 +3.62% 1975 25,492 +0.96% 1982 24,394 −0.63% 1990 27,947 +1.71% 1999 27,494 −0.18% 2007 27,670 +0.08% 2012 27,352 −0.23% 2017 29,108 +1.25% 2023 29,489 +0.22%
Source: EHESS4 and INSEE (1968-2023)5

Ermont is served by Ermont–Eaubonne station which is an interchange station on Paris RER line C, on the Transilien Paris-Nord suburban rail line, and on the Transilien Paris-Saint-Lazare suburban rail line.

Ermont is also served by Cernay station which is an interchange station on Paris RER line C and on the Transilien Paris-Nord suburban rail line.

Finally, Ermont is also served by two stations on the Transilien Paris – Nord suburban rail line: Ermont-Halte and Gros Noyer–Saint-Prix.

• Anita Conti, explorer and photographer,
• Marc Foucan, athlete
• Yvonne Lefébure, concert pianist and teacher
• Pierre Leyris, translator
• Landing Sané, basketball player
• DJ Snake, DJ and record producer
• Alice Taglioni, actress

Ermont is twinned with:⁶