The Church of Saint-Victor in Guyancourt
The Church of Saint-Victor in Guyancourt
Coat of arms of Guyancourt
Location (in red) within Paris inner and outer suburbs
Location (in red) within Paris inner and outer suburbs
Location of Guyancourt
Guyancourt is located in France
Guyancourt is located in Île-de-France (region)
Coordinates: 48°46′17″N 2°04′26″E / 48.7714°N 2.0739°E / 48.7714; 2.0739Coordinates: 48°46′17″N 2°04′26″E / 48.7714°N 2.0739°E / 48.7714; 2.0739
 • Mayor (2020–2026) François Morton
13.0 km2 (5.0 sq mi)
 (Jan. 2019)[1]
 • Density2,300/km2 (5,900/sq mi)
Time zoneUTC+01:00 (CET)
 • Summer (DST)UTC+02:00 (CEST)
INSEE/Postal code
78297 /78280
1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries.

Guyancourt (French: [ɡɥi.jɑ̃.kuʁ] (listen)) is a commune in the Yvelines department in the Île-de-France region in north-central France. It is located in the south-western suburbs of Paris, 21.2 km (13.2 mi) from the center of Paris, in the "new town" of Saint-Quentin-en-Yvelines.


The commune of Guyancourt comprises several districts. The first of them, corresponding to the old village, is known as "le village", the others are named:

The bordering communes are Versailles to the northeast, Voisins-le-Bretonneux to the southwest, Montigny-le-Bretonneux to the west, Châteaufort to the southeast, Magny-les-Hameaux to the south and Saint-Cyr-l'Ecole in the northwest.

Although located in the Paris suburbs (in an Anglo-Saxon conception of suburbs), more than half of the territory of the commune of Guyancourt is covered in natural spaces: forests, wood, parks, gardens and ponds.



The site of the city was already inhabited by Neolithic tribes who left hundreds of vestiges such as arrows, flint scrapers, polished axes... which have been recovered in the districts of Bouviers, Troux and Villaroy.


The civilization continued through Roman times, as Mr. Leclère, a farmer, demonstrated in a fortuitous way in 1892 by unearthing an antique ballot box in his field.

The religious life

Work to restore the church Saint-Victor put the date of the sarcophages at the Merovingian era (from the seventh century). It is believed that the construction of the first church dates from the fourteenth century. Several funerary vases and a tomb stone dating from the sixteenth century were updated. The church was renovated in the fifteenth century, then entirely rebuilt in the sixteenth century. The most recent restoration goes back to 1998.

Guyancourt and the Palace of Versailles

Guyancourt forms part of the "Grand Parc" of the sun king Soleil (Louis XIV), which extended around the castle of Versailles. The essential vocation of the populous communes neighbouring the castle is market-gardening, to provide for the important needs for the Court.

French revolution

Thanks to the register of grievances sent to the governmental authorities (1789), we know that Guyancourtois, who were mostly modest peasants, lived with difficulty under conditions of famine.

The Franco-Prussian War of 1870

France is partly occupied by the Prussian armies. The enemy spreads terror, the houses are plundered, the inhabitants maltreated. Four hundred of them (an enormous figure for the time) prefer to flee.

The 1900s

At the beginning of the twentieth century, Guyancourt was a large village where one cultivates corn, oats, beets, fodder and potatoes. The trades were numerous, with almost 16 wine merchants for 614 inhabitants.

The war of 1914–1918 cost the lives of thirty-six Guyancourtois. The war of 1939–1945 also touched Guyancourt, which was liberated by August 25, 1944.

The end of the twentieth century

Starting from the beginning of the 1950s, the Paris area saw a considerable demographic growth. To structure the development of the suburbs, it was decided to create several new towns around Paris, one of which being Saint-Quentin-en-Yvelines. The new city of Saint-Quentin-en-Yvelines includes today seven communes (eleven in the beginning), one of which is Guyancourt. In 1950 Guyancourt was only one small village. The commune grew since 1970 to reach the figure of 27,000 inhabitants in 2004.


Historical population
YearPop.±% p.a.
1793 548—    
1800 561+0.34%
1806 594+0.96%
1821 610+0.18%
1831 628+0.29%
1836 585−1.41%
1841 683+3.15%
1846 699+0.46%
1851 645−1.60%
1856 577−2.20%
1861 624+1.58%
1866 630+0.19%
1872 636+0.16%
1876 665+1.12%
1881 698+0.97%
1886 652−1.35%
1891 708+1.66%
1896 710+0.06%
YearPop.±% p.a.
1901 614−2.86%
1906 644+0.96%
1911 636−0.25%
1921 684+0.73%
1926 848+4.39%
1931 852+0.09%
1936 824−0.67%
1946 856+0.38%
1954 1,010+2.09%
1962 1,244+2.64%
1968 1,493+3.09%
1975 3,450+12.71%
1982 10,983+17.99%
1990 18,307+6.60%
1999 25,079+3.56%
2007 28,563+1.64%
2012 28,039−0.37%
2017 28,633+0.42%
Source: EHESS[2] and INSEE (1968-2017)[3]


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International relations

Main article: List of twin towns and sister cities in France

Guyancourt is twinned with:

Notable people


Industrial fabric

Guyancourt accommodates not only many SME and trade, but also several large companies, such as:


Higher education and research

Primary and secondary schools

Junior high schools:

Senior high schools:


Guyancourt is served by no station of the Paris Métro, RER, or suburban rail network. The closest station to Guyancourt is Saint-Quentin-en-Yvelines–Montigny-le-Bretonneux station on Paris RER line C, on the Transilien La Défense suburban rail line, and on the Transilien Paris-Montparnasse suburban rail line. This station is located in the neighboring commune of Montigny-le-Bretonneux, 2.7 km (1.7 mi) from the town center of Guyancourt.

See also


  1. ^ "Populations légales 2019". The National Institute of Statistics and Economic Studies. 29 December 2021.
  2. ^ Des villages de Cassini aux communes d'aujourd'hui: Commune data sheet Guyancourt, EHESS. (in French)
  3. ^ Population en historique depuis 1968, INSEE
  4. ^ Linlithgow
  5. ^ "Bouygues reste fidèle à son architecte." Le Journal du Net. Retrieved on 7 July 2010.
  6. ^ "Collège Ariane." Guyancourt. Retrieved on September 3, 2016.
  7. ^ "Collège Les Saules." Guyancourt. Retrieved on September 3, 2016.
  8. ^ "Collège Paul-Eluard." Guyancourt. Retrieved on September 3, 2016.
  9. ^ "Lycée Polyvalent Descartes." Guyancourt. Retrieved on September 3, 2016.
  10. ^ "Lycée de Villaroy." Guyancourt. Retrieved on September 3, 2016.
  11. ^ "Lycée Émilie-de Breteuil." Guyancourt. Retrieved on September 3, 2016.
  12. ^ "Lycée d'État d'Hôtellerie et de Tourisme." Guyancourt. Retrieved on September 3, 2016.