Guyancourt, Île-de-France
Guyancourt: commune in Yvelines, France
About
Quick Facts about Guyancourt
| Population | 624 |
| Country | France |
| State | Île-de-France (France) |
| County | Yvelines |
| Postal code | 78280 |
| Area | 13 km2 |
| Official name | Guyancourt |
| Latitude & Longitude | 48.7733,2.0739 |
| Male population | 14153 |
| Female population | 14480 |
| Altitude | 548 feet / 167 meters |
| Time Zone | Central European Summer Time, UTC+02:00, UTC+01:00 |
| Local time | 18:59:54 (15th April 2026) |
Geography
Guyancourt is located at 48°46'24"N 2°4'26"E (48.7733400, 2.0739300). It has 6 neighbors: Voisins le Bretonneux, Versailles, Montigny le Bretonneux, Magny les Hameaux, Chateaufort and Buc.
Guyancourt map
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Official website of Guyancourt
Official WebsiteDemographics
| Year | Population | % Change | Method |
|---|---|---|---|
| 1793 | 548 | - | census |
| 1800 | 561 | 2.32% | statistical updating |
| 1806 | 594 | 5.56% | census |
| 1821 | 610 | 2.62% | statistical updating |
| 1836 | 585 | -4.27% | census |
| 2013 | 27,546 | 97.88% | census |
| 2014 | 27,328 | -0.8% | census |
| 2015 | 27,801 | 1.7% | census |
| 2016 | 28,839 | 3.6% | census |
| 2017 | 28,633 | -0.72% | census |
| 2018 | 624 | -4488.62% | statistical updating |
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