Guyancourt
| Guyancourt | |
|---|---|
| The Church of Saint-Victor in Guyancourt | |
| Location (in red) within Paris inner and outer suburbs | |
| Location of Guyancourt | |
| Coordinates: 48°46′17″N 2°04′26″E / 48.7714°N 2.0739°E | |
| Country | France | 
| Region | Île-de-France | 
| Department | Yvelines | 
| Arrondissement | Versailles | 
| Canton | Montigny-le-Bretonneux | 
| Intercommunality | Saint-Quentin-en-Yvelines | 
| Government | |
| • Mayor (2020–2026) | François Morton | 
| Area 1 | 13.0 km2 (5.0 sq mi) | 
| Population  (2022) | 29,758 | 
| • Density | 2,300/km2 (5,900/sq mi) | 
| Time zone | UTC+01:00 (CET) | 
| • Summer (DST) | UTC+02:00 (CEST) | 
| INSEE/Postal code | 78297 /78280 | 
| Elevation | 138 m (453 ft) | 
| 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] ⓘ) 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.