One-person households: 21%, a lower share than 99% of compared French towns
The share of households in social housing is 4.1%, against 12% in the typical compared French town. Saint-Lambert has more households headed by a retired person than 93% of compared French towns, at 45%. The 2023 Census counted 447 residents in 170 households. Flats account for 11%.
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 Saint-Lambert
Many graduates
64% of residents 15 and over who have left education hold a diploma above the bac, 36% a master’s or more (bac+5). Qualifications ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
Saint-Lambert changed by +2% from 2012 to 2023, behind 63% 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
From 2012 to 2017 the population moved +3%, and from 2017 to 2023 −1%; the median compared French town changed +5% and the median Yvelines town +7%.
A median age of 46.6: Saint-Lambert is older than 67% 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
■ Saint-Lambert 46.6. The median compared French town: 44.
In the typical compared French town, the share of residents aged 15 to 24 is 11%; Saint-Lambert has 9.6%. 22% of residents are 65 or over, or about one in five.
Women and men · all residents
49% women, 51% men
About an even split. Median share of women: Yvelines 51.6%, France 51.8%.
In Saint-Lambert, 6.1% of households are single parents, fewer than in 96% 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
In the typical compared French town, the share of couples with children is 25%; Saint-Lambert has 31%. Typically, one in ten households are single parents in the typical compared French town. On average, 2.5 people share a household.
In Saint-Lambert, 3.4% of households have no car, fewer than in 97% 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
6.7% of homes stand empty in the typical compared French town, against 5.2% in Saint-Lambert. The usual figure: 11% of households have no car in the typical compared French town. Census figures put second homes at 2.4% locally.
€43,780 a year: the median standard of living
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.
Half of Saint-Lambert’s residents live in households with a standard of living below €43,780 a year per consumption unit, and half above: higher than in 99% of compared French towns.
Saint-Lambert sits above 94% of compared French towns for households headed by a manager or professional (25%)
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
Households headed by a manual worker are rarer here than in 99% of compared French towns. Across the comparison, nearly one in ten 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).
Foreign nationals make up 2.3% in Saint-Lambert, less than in 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 lower than in 51% of compared French towns. The usual figure: 4.3% of residents are foreign nationals in the typical compared French town. 6.4% of residents are immigrants.
INSEE publishes no country of birth or ethnicity by commune in these tables, and the census doesn’t ask about religion.
49% of residents 15 and over are married, a share 86% of compared French towns don’t reach
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
In Saint-Lambert, 21% of residents 15 and over are single, beside 25% in the typical compared French town. The share of married residents in the typical compared French town is 43%.
A higher share of graduates of higher education than 98% of compared French towns, at 64%
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
6.9% of adults out of school have no qualification; in the typical compared French town the figure is 19%. As a reference point, 30% of adults out of school hold a higher-education qualification in the typical compared French town.
The 18th oldest of 41 French towns of 447 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.
The youngest is Villejust (37.2), the oldest Prayssac (62.3).
Saint-Lambert sits below 1 of its 6 closest neighbors on median age
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Saint-Lambert | 46.6 | 22% | 2.4% | 6.4% |
| Chevreuse 5,502 · 2.1 mi | 46 | 21% | 4% | 10% |
| Voisins-le-Bretonneux 10,624 · 2.5 mi | 44.9 | 21% | 1.7% | 11% |
| Le Mesnil-Saint-Denis 7,276 · 2.8 mi | 43.2 | 20% | 1.9% | 8.9% |
| Saint-Rémy-lès-Chevreuse 7,747 · 3.1 mi | 47.7 | 24% | 4.2% | 11% |
| Montigny-le-Bretonneux 32,465 · 3.1 mi | 39.7 | 15% | 2.4% | 16% |
| La Verrière 5,994 · 3.2 mi | 35.4 | 15% | 0.8% | 26% |
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 Saint-Lambert
What is the population of Saint-Lambert?
447 at INSEE’s 2023 census, 2% more than in 2012 (440).
How old are Saint-Lambert’s residents?
The median age is 46.6, older than 67% of compared French towns. 23% are under 18 and 22% 65 or older.
How many second homes are there in Saint-Lambert?
4, with occasional dwellings: 2.4% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Saint-Lambert?
INSEE counts 29 immigrants (born abroad, not French at birth), 6.4% of residents, and 10 foreign nationals (2.3%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Saint-Lambert?
€43,780 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.