Each edition grades its towns against each other only.
A town of 29,778 in Yvelines, Île-de-France.
Guyancourt grades B overall: better than 63% of compared French towns, and #41 of 91 in Yvelines. Its weakest subject is cost of living (D): at the median price, a 70 m² home costs 9.4 times the median annual income per consumption unit in the intercommunality. Its strongest is walkability (A+): 99% of residents live within 800 m of a bakery, and 38% of working residents walk, cycle or take public transport to work.
Hazard risk isn’t graded in France yet: national flood maps cover only some areas. The overall grade uses the other six subjects.
The 3 things Guyancourt does most differently from other towns.
Each subject compares Guyancourt with other French towns of 2,500 or more, ordered by how far its rank is from the middle. American and UK towns are graded separately.
How TownRatings grades French towns →
Guyancourt has 1 historic monument on the Culture ministry’s list, none at the highest level (classé).
1.2% of its homes were built before 1919, against 7.4% in the median compared French town.
Paul-Marie Leroy, born in 1733, is the one person born in Guyancourt before 1900 that Wikidata records.
Heritage, gardens and other places to visit in and near Guyancourt. Best known first.
GardenJardin de Versailles5 km northeast, in Versailles
GardenPotager du roi4.9 km northeast, in Versailles
MuseumMusée national de Port-Royal des Champs4.7 km southwest, in Magny-les-HameauxGardenGardenJardin des Gogottesin townGardenGardenJardin Partagé des Saulesin townPhotos from Wikimedia Commons, each under its own licence (our copy, resized).
Data highlights are ordered by what stands out in Guyancourt.
Children under 15 make up 22%, above Yvelines’ towns (20%) and compared French towns (17%) alike. Young adults of 15 to 24 are 13% of the population. Graduates make up 48% of adults.
51% women, 49% men
About 95 men for every 100 women. Median share of women: Yvelines 51.6%, France 51.8%.
| Guyancourt | Yvelines median | France median | |
|---|---|---|---|
| Under 15 | 22% | 20% | 17% |
| 15–24 | 13% | 12% | 11% |
| 25–44 | 29% | 25% | 23% |
| 45–64 | 25% | 26% | 26% |
| 65+ | 11% | 17% | 22% |
| No diploma | 15% | 13% | 19% |
| CAP or BEP | 16% | 16% | 26% |
| Baccalauréat | 18% | 16% | 18% |
| Higher education | 48% | 49% | 30% |
INSEE, census 2023 · Yvelines median and France median: the median of compared communes
Half of residents lived on more than €27,570 a year per consumption unit, lower than Yvelines’ towns (€32,600) yet higher than compared French towns (€25,970). The unemployment rate comes to 11.7%. 37,550 jobs are based in Guyancourt, for 13,800 working residents (2.7 per worker).
Source: INSEE, census 2023 (commuting, employment, jobs at place of work); INSEE, Filosofi 2023 · Licence Ouverte
Rents are the ministry’s estimates of advertised rents, not rents actually paid.
The split in Guyancourt: €4,214/m² for houses, €3,685/m² for apartments. The estimated advertised rent is €19.00/m² a month, near Yvelines’ towns (€18.40/m²) and higher than compared French towns (€12.41/m²). The market here: 501 sales of houses and apartments between July 2023 and June 2026.
| By type | Median per m² | Sales |
|---|---|---|
| Houses | €4,214/m² | 129 |
| Apartments | €3,685/m² | 372 |
Source: DGFiP, DVF property sales (Etalab geolocated); Housing Ministry, Carte des loyers 2025; INSEE, Filosofi 2023 · Licence Ouverte
Care access and life expectancy are shown for context, not graded.
Adjusted mortality in Guyancourt: 77 deaths for every 100 expected. From 2016 to 2025, 1,067 residents of Guyancourt died, against 1,239 expected from France’s death rates at each age: 14% fewer. At birth, a girl in Yvelines can expect 86.8 years and a boy 82.3 (2025); across France, 85.9 and 80.3. Also worth knowing: there are 16 general practitioners locally.
Source: INSEE, deaths by commune of residence 2016–2025 and censuses; Eurostat, death rates by age (© European Union); INSEE, BPE 2025; DREES, APL 2024; INSEE, life expectancy by département 2025 · Licence Ouverte · Allowing for care homes is a TownRatings estimate, not a published statistic.
France has no History Grade yet: this card describes, it doesn’t grade.
The Culture ministry lists 1 historic monument in Guyancourt, none of them classé, France’s highest protection. 1.2% of its homes were built before 1919, against 7.4% in the median compared French town.
Ministère de la Culture, Mérimée (Licence Ouverte 2.0) · INSEE, census 2023, homes by build period
Primary schools aren’t graded: France doesn’t publish their results by school.
Vocational results within 5 km: 87% passed the bac pro, of 403 candidates at 5 lycées. On results, collèges and lycées here come #31 of 94 in Yvelines.
| School | Level | Candidates | Passed, 2025 |
|---|---|---|---|
| Collège Paul ÉluardNearest collègeCollège | Collège | 130 | 74%−14 pts |
| Lycée de VillaroyNearest lycéeGeneral lycée | General lycée | 302 | 89%−6 pts |
| Lycée Émilie de BreteuilBest against expectations: 8 points above the expected rateVocational lycée | Vocational lycée | 23 | 91%+8 pts |
Ministry of Education (DEPP) · brevet and bac 2025, value added (IVAC, IVAL) · Licence Ouverte
573 offenses were reported in Guyancourt during 2025. Violence against people averaged 7.5 per 1,000 residents a year over 2023–2025; graded property crimes averaged 12.1. More of the graded crimes here were criminal damage than anything else (2025).
Not in the gradeTheft without violence, drug use and fraud are shown for information but left out of the Safety Grade, which counts violence plus burglaries, vehicle thefts, thefts from vehicles and criminal damage per resident.
Source: SSMSI (Interior Ministry), recorded crime by commune, 2023–2025 · Licence Ouverte · For armed robbery, this figure isn’t published when it’s small (five or fewer in at least one of the last three years); the index uses the département’s average instead, 0.2% of the index here. The count covers the offense categories the Safety Grade uses.
Guyancourt has one historic monument; beside it, the nearest classé monuments in other towns, within 15.5 mi.
Église Saint-Victor: Photo: Langladure · CC BY-SA 3.0
One notable person was born in Guyancourt.
The nearest towns of 2,500 or more. The map uses IGN’s commune boundaries. See them on the map →
| Town | People | Miles | Overall | Cost | Safety | Health |
|---|---|---|---|---|---|---|
| Guyancourt | 29,778 | — | B | D | B | A− |
| Voisins-le-Bretonneux | 10,624 | 1.1 | A− | D− | B+ | A |
| Montigny-le-Bretonneux | 32,465 | 1.4 | B+ | D− | B | A |
| Saint-Cyr-l'École | 21,268 | 2.1 | C+ | D | B− | B |
| Buc | 5,816 | 2.7 | A | D | B+ | A+ |
| Fontenay-le-Fleury | 13,680 | 2.8 | B+ | C− | B+ | A |
| Bois-d'Arcy | 16,586 | 2.8 | B+ | C− | B− | A+ |
People: INSEE, census 2023. Miles: center to center.
It grades B for safety, #44 of 91 in Yvelines. In 2025 police and gendarmerie recorded 43 burglaries and 188 acts of criminal damage.
They grade C+, better than 41% of compared French towns and #31 of 94 in Yvelines. 89% of 302 candidates passed the bac at Lycée de Villaroy in 2025, 6 points below the expected rate given its pupils’ backgrounds. Primary schools aren’t graded: France doesn’t publish their results by school.
Incomes are higher than in most compared French towns, so Guyancourt grades D for cost of living.
Commune in Yvelines, Île-de-France
Guyancourt is a commune of 29,778 people in the Communauté d'agglomération de Saint-Quentin-en-Yvelines. TownRatings compares communes, France’s local unit: each has its own mayor and its own statistics. Its area takes in the town and the countryside around it.
Built from INSEE’s 2026 official geography (COG) and IGN Admin Express boundaries
Sources: INSEE, census 2023 (population, employment, commuting) · INSEE, Filosofi 2023 (income per consumption unit, poverty) · DGFiP, DVF property sales, July 2023 to June 2026 · Housing Ministry, Carte des loyers 2025 · SSMSI, recorded crime by commune, 2023–2025 · Ministry of Education (DEPP), brevet and bac results and value-added indicators, 2025 · INSEE, deaths by commune of residence 2016–2025 and censuses 2012–2023; Eurostat, death rates by age (© European Union); INSEE, BPE 2025 (care homes, emergency and maternity units, GPs, pharmacies); DREES, APL 2024; INSEE, life expectancy by département 2025 (provisional) · INSEE, BPE 2025 and Filosofi 200 m grid (walking distances) · IGN Admin Express (boundaries) · TownRatings grades: our own summary of the data, ranking French towns against each other only, updated October 30, 2026. Under the Licence Ouverte / Open Licence 2.0 (Etalab).
Contains public sector information under the Licence Ouverte / Open Licence 2.0 (Etalab): INSEE, DGFiP, the Interior Ministry’s statistics service (SSMSI), the Ministry of Education (DEPP), the Health Ministry’s statistics service (DREES) and the Housing Ministry (Carte des loyers). Commune boundaries: IGN Admin Express.