The commune of Achères lies on the south bank of the Seine in a loop of the river, on the edge of the Forest of Saint-Germain-en-Laye. It borders Saint-Germain-en-Laye and Poissy on the south, Andrésy and Carrières-sous-Poissy on the west, Conflans-Sainte-Honorine and Herblay on the north, and Maisons-Laffitte and La Frette-sur-Seine on the east.

Inhabitants of Achères are called Achérois.

Between 18 December 1898 and 29 April 1899 the first six world land speed records were set in Achères, as Gaston de Chasseloup-Laubat and Camille Jenatzy alternately raised the world record speed from 39.245 miles per hour (63.159 km/h) to 65.792 miles per hour (105.882 km/h).

Gaston de Chasseloup-Laubat drove his electric powered Jeantaud, while Camille Jenatzy used the electric car, built by the de: Compagnie Générale des Transports Automobiles (CITA), Nº 25, La Jamais Contente, the first purpose-designed land speed racer, and set the first record over 100 km/h (60 mph).

• 
  Count Gaston de Chasseloup-Laubat
  in the Jeantaud Duc Profilée
• 
  Camille Jenatzy in "La Jamais Contente" in 1899, the first automobile to reach 100 km/h.

Historical population

Year Pop. ±% p.a. 1793 349 —     1800 415 +2.51% 1806 416 +0.04% 1821 433 +0.27% 1831 479 +1.01% 1836 506 +1.10% 1841 508 +0.08% 1846 553 +1.71% 1851 585 +1.13% 1856 595 +0.34% 1861 660 +2.10% 1866 648 −0.37% 1872 715 +1.65% 1876 853 +4.51% 1881 874 +0.49% 1886 847 −0.63% 1891 801 −1.11% 1896 944 +3.34%	Year Pop. ±% p.a. 1901 1,158 +4.17% 1906 1,260 +1.70% 1911 1,496 +3.49% 1921 1,703 +1.30% 1926 2,374 +6.87% 1931 3,109 +5.54% 1936 3,641 +3.21% 1946 3,936 +0.78% 1954 4,459 +1.57% 1962 5,390 +2.40% 1968 10,444 +11.66% 1975 15,172 +5.48% 1982 15,351 +0.17% 1990 15,039 −0.26% 1999 18,942 +2.60% 2007 19,789 +0.55% 2012 19,469 −0.33% 2017 21,017 +1.54%
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Source: EHESS and INSEE (1968–2017)

Achères is served by Achères-Ville and Achères–Grand-Cormier stations on Paris RER line , as well as Line L on the Transilien Paris-Saint-Lazare suburban rail.

By road, it is accessible from the N184, the Route de Poissy, and the D30.

Achères is twinned with:

• Amarante, Portugal
• Großkrotzenburg, Germany
• Stonehaven, Scotland, United Kingdom

• Communes of the Yvelines department

Wikimedia Commons has media related to Achères, Yvelines.

• Official website (in French)

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