Couples with children make up 38% in Boissy-le-Sec, more than in 97% of compared French towns
Households headed by a retired person make up 21%, against 32% in the typical compared French town. Boissy-le-Sec counted 690 residents and 270 households at the 2023 Census. Put another way, about one in 13: 8% of homes are flats. 15% of residents are 65 or over, a lower share than in 89% of compared French towns.
Throughout this page, the Essonne 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 Boissy-le-Sec
A town of families
38% of households are couples with children and 13% single parents with children; 20% of residents are under 15. Households ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
A ±0% change since 2012: slower than 70% 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
Medians for comparison: +5% across compared French towns, +6% in Essonne. Here the change came as −1% to 2017, then +1% to 2023.
Half of Boissy-le-Sec is under 41.9, younger than 66% 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
■ Boissy-le-Sec 41.9. The median compared French town: 44.
Residents aged 15 to 24 are about as common here as in the typical compared French town: 11%.
Women and men · all residents
49% women, 51% men
About 106 men for every 100 women. Median share of women: Essonne 51.3%, France 51.8%.
In Boissy-le-Sec, 23% of households are one person living alone, fewer than in 97% 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 Essonne median and the France median
Living alone · share
With single-parent households at 13%, Boissy-le-Sec is ahead of 87% of compared French towns on that count. One-person households: 35% in the typical compared French town, for comparison. Average household size: 2.5 people.
2.7% of households have no car, below 99% of compared French towns
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
Of all households, 12% moved in during the last two years and 19% have stayed three decades or more. Few places have so few households in social housing: 1.1% here, fewer than in 99% of compared French towns. In the typical compared French town, 11% of households have no car. The figure for second homes is 4.6% in Boissy-le-Sec and 2.1% in the typical compared French town.
A typical living standard of €31,090 a year
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 €31,090 a year: higher than in 89% of compared French towns.
More households headed by a manager or professional than 80% of compared French towns: 16%
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
In the typical compared French town, the share of households headed by a manual worker is 14%; Boissy-le-Sec has 16%. To put it in context, 9.4% of households are headed by a manager or professional in the typical compared French town.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
4.3% of residents are immigrants, fewer than in 71% 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.
On the census count, 4.2% of residents are foreign nationals. Against that, 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.
In Boissy-le-Sec, 20% of residents 15 and over are single, fewer than in 92% of compared French towns
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
46% of residents 15 and over are married (typical compared French town: 43%). Single residents make up 25% in the typical compared French town.
Fewer adults with no qualification than 68% of compared French towns: 16%
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
Graduates of higher education make up 35%, against 30% in the typical compared French town. The benchmark for adults with no qualification in the typical compared French town: 19%.
The 8th youngest of 41 French towns of 690 to 2,582 people
The 40 compared French towns nearest in population, by median age. Hover for each one’s second homes and immigrants; click for its page.
Villejust is the youngest (37.2); Prayssac the oldest (62.3).
Boissy-le-Sec is younger than 2 of its 6 nearest neighbors
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Boissy-le-Sec | 41.9 | 15% | 4.6% | 4.3% |
| Étampes 26,857 · 4.5 mi | 36 | 14% | 0.7% | 22% |
| Étréchy 6,986 · 4.6 mi | 43.8 | 23% | 1.6% | 8.5% |
| Dourdan 11,415 · 4.7 mi | 40.6 | 18% | 2.2% | 15% |
| Saint-Chéron 5,132 · 5.1 mi | 41.6 | 18% | 13% | 9.8% |
| Morigny-Champigny 4,412 · 5.3 mi | 47 | 24% | 1% | 6.2% |
| Breuillet 9,157 · 7.4 mi | 39.4 | 16% | 1.3% | 13% |
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 Boissy-le-Sec
What is the population of Boissy-le-Sec?
690 at INSEE’s 2023 census, about the same as in 2012 (690).
How old are Boissy-le-Sec’s residents?
The median age is 41.9, younger than 66% of compared French towns. 24% are under 18 and 15% 65 or older.
How many second homes are there in Boissy-le-Sec?
14, with occasional dwellings: 4.6% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Boissy-le-Sec?
INSEE counts 29 immigrants (born abroad, not French at birth), 4.3% of residents, and 29 foreign nationals (4.2%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Boissy-le-Sec?
€31,090 a year per consumption unit in 2023 (median of compared French towns €25,970). 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.