Photo: Franck devedjian · CC BY-SA 4.0A higher share of households headed by a manager or professional than 99% of compared French towns, at 41%
The share of flats tops 79% of compared French towns: 55%. Buc had 5,816 residents in 2,540 households at the 2023 census. 29% of households are couples with children. The median age locally is 42, lower than in nearly two thirds of compared French towns.
Throughout this page, the Yvelines median and the France median are the median of compared communes (those with an overall grade), each figure its own median. Source: INSEE, census 2023.
What stands out about the people of Buc
Many graduates
68% of residents 15 and over who have left education hold a diploma above the bac, 41% a master’s or more (bac+5). Qualifications ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
A +6% change since 2012: Buc grew faster than 57% of compared French towns
Residents at INSEE’s last three censuses, each recast in the 2026 commune boundaries. France has no yearly estimate by commune between censuses.
2012 to 2023
2017 to 2023
Against +5% for the median compared French town and +7% for the median Yvelines town, the change came in two steps: +7% from 2012 to 2017, then ±0% to 2023.
In Buc, 20% of residents are 65 or over, fewer than in 65% of compared French towns
Shares of residents by age at the 2023 census.
Age groups · share of residents
Median age of the 3,798 compared French towns
■ Buc 42. The median compared French town: 44.
By its share of residents aged 15 to 24 (12%), Buc is above 71% of compared French towns. In the typical compared French town, 22% of residents are 65 or over.
Women and men · all residents
52% women, 48% men
About 93 men for every 100 women. Median share of women: Yvelines 51.6%, France 51.8%.
In Buc, 8.6% of households are single parents, fewer than in 72% of compared French towns
A household is everyone who shares a main home (résidence principale). Household types come from INSEE’s fuller sample of a quarter of census forms.
Against the Yvelines median and the France median
Living alone · share
The typical household size is 2.3 people. Against that, one in ten households are single parents in the typical compared French town. Census figures put one-person households at 35% in Buc.
Buc sits below 81% of compared French towns for empty homes (4.5%)
Every home the census counted: main residences, second homes and occasional dwellings (INSEE counts them together), and empty homes. Owning and renting are on Cost of living.
All homes · share of homes
Type of home
Cars per household · share of households
Just over one in ten households rent social housing (HLM) in the typical compared French town, against 14% in Buc. This Yvelines town has fewer second homes than nearly three fifths of compared French towns, at 1.7%. Against that, 6.7% of homes stand empty in the typical compared French town. Households without a car make up about one in nine here (11%).
€39,130 a year is the median standard of living here
The standard of living (niveau de vie) is a household’s disposable income after taxes and benefits, divided by its consumption units (UC) to allow for its size and make-up: 1 for the first adult, 0.5 for each other person 14 or older, 0.3 for each child under 14.
Medians of compared communes. Source: INSEE, Filosofi 2023.
Per consumption unit, half of residents live on more than €39,130 a year: higher than in 98% of compared French towns. Some 4.0% of residents fall below the poverty line.
Households headed by a manual worker make up 2.2% in Buc, less than in 99% of compared French towns
Households by the socio-professional group (PCS) of their reference person, INSEE’s own categories. Jobs and commuting are on the Work & commute page.
Households by reference person’s group · share of households
28% of households are headed by a retired person (typical compared French town: 32%). Elsewhere, 14% of households are headed by a manual worker in the typical compared French town.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
Immigrants: 11%, a higher share than 74% of compared French towns
INSEE publishes two measures, which overlap but aren’t the same. Neither is the UK’s “born abroad”.
Share of residents · census 2023
Immigrant (immigré)
Born abroad, not French at birth. Someone stays an immigrant after becoming French. A French citizen born abroad (for example in Algeria before 1962) is not one.
Foreign national (étranger)
Not a French citizen today, wherever born. A child born in France to foreign parents can be a foreign national without being an immigrant.
The median compared commune in Yvelines has 15%; immigrants here make up a share higher than in 74% of compared French towns. The share of foreign nationals stands at 7%. As a reference point, 6.5% of residents are immigrants in the typical compared French town.
INSEE publishes no country of birth or ethnicity by commune in these tables, and the census doesn’t ask about religion.
A larger share of married residents than 79% of compared French towns: 47%
Residents 15 and over by how they live: the census asks both the legal status and whether people live as a couple.
Residents 15 and over · share
On the census count, 26% of residents 15 and over are single. In the typical compared French town, the share of married residents is 43%.
More graduates of higher education than 99% of compared French towns: 68%
Highest diploma of residents 15 and over who have left education, in French terms: the levels don’t map one-to-one to UK or U.S. ones.
Highest diploma · 15 and over, out of education
In Buc, nearly one in ten adults out of school have no qualification, beside 19% in the typical compared French town. As a yardstick, 30% of adults out of school hold a higher-education qualification in the typical compared French town.
Ranked by age, 14th youngest of 41 French towns this size
The 40 compared French towns nearest in population, by median age. Hover for each one’s second homes and immigrants; click for its page.
Ages run from 35.9 in Viry to 57.4 in Montmorillon.
No nearby town is as old as Buc
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Buc | 42 | 20% | 1.7% | 11% |
| Versailles 84,095 · 2.1 mi | 39 | 19% | 4.8% | 13% |
| Jouy-en-Josas 7,981 · 2.2 mi | 34.2 | 16% | 3.9% | 14% |
| Guyancourt 29,778 · 2.7 mi | 35.4 | 11% | 2.4% | 18% |
| Viroflay 17,237 · 2.9 mi | 40 | 17% | 2.4% | 13% |
| Vélizy-Villacoublay 23,011 · 2.9 mi | 36.8 | 17% | 4.7% | 15% |
| Saclay 4,437 · 3.2 mi | 40.4 | 16% | 2% | 9.5% |
Health, work, housing and schools
What this data can and can’t tell you
- Census 2023. INSEE’s census is a rolling survey: a fifth of small communes each year, 8% of homes in large ones each year. “2023” pools the surveys of 2021 to 2025, so the figures describe the town around 2023, not on one day.
- Medians of compared communes. The comparisons are the median of the département’s compared communes and of France’s (those with an overall grade), each figure its own median: not the total for the département or for France, which large cities pull towards their own figures.
- Immigrants and foreign nationals. INSEE’s two measures: an immigrant was born abroad without French nationality; a foreign national isn’t French today. Neither is a count of people born abroad, which INSEE doesn’t publish by commune.
- Second homes. Homes used for holidays or weekends, with occasional dwellings (kept for work, for example), which INSEE counts together. Their owners are counted where they live, not here.
- Standard of living. INSEE’s Filosofi: disposable income per consumption unit, from tax and benefit files, 2023. The poverty rate is the share of residents below 60% of France’s median. Not published for the smallest communes.
- What France doesn’t ask. The French census asks nothing about ethnicity, religion, language or health, so this page has no such section.
Questions about who lives in Buc
What is the population of Buc?
5,816 at INSEE’s 2023 census, 6% more than in 2012 (5,462).
How old are Buc’s residents?
The median age is 42, younger than 66% of compared French towns. 23% are under 18 and 20% 65 or older.
How many second homes are there in Buc?
45, with occasional dwellings: 1.7% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Buc?
INSEE counts 630 immigrants (born abroad, not French at birth), 11% of residents, and 410 foreign nationals (7%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Buc?
€39,130 a year per consumption unit in 2023 (median of compared French towns €25,970); 4.0% of residents live below the poverty line. Source: INSEE, Filosofi.
Sources: INSEE, census 2023 (population, ages, households, homes, marital status, diplomas, immigrants, foreign nationals, employment), 2026 geography · INSEE, Filosofi 2023 (standard of living, poverty) · IGN Admin Express (boundaries) · Medians and percentiles: TownRatings, over compared French towns, updated November 4, 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.