Longnes ranks above 97% of compared French towns on couples with children: 38%
In Longnes, 11% of homes are flats, beside 30% in the typical compared French town. This Yvelines town had 1,601 residents in 630 households at the 2023 census. The share of residents aged 65 and over stands at 14%. Households in social housing are rarer here than in 99% 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 Longnes
A town of families
38% of households are couples with children and 7.6% single parents with children; 21% of residents are under 15. Households ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
A +9% change since 2012: Longnes grew faster than 67% 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 −1%, and from 2017 to 2023 +11%; the median compared French town changed +5% and the median Yvelines town +7%.
Longnes is younger than 78% of compared French towns: a median age of 40.2
Shares of residents by age at the 2023 census.
Age groups · share of residents
Median age of the 3,798 compared French towns
■ Longnes 40.2. The median compared French town: 44.
In the typical compared French town, the share of residents aged 15 to 24 is 11%; Longnes has 10%.
Women and men · all residents
50% women, 50% men
About an even split. Median share of women: Yvelines 51.6%, France 51.8%.
A lower share of one-person households than 98% of compared French towns, at 22%
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
Here 7.6% of households are single parents, where the figure in the typical compared French town is 10%. The share of one-person households in the typical compared French town is 35%. On average, 2.5 people share a household.
In Longnes, 5.2% of households have no car, fewer than in 86% 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
Recent arrivals (under two years) make up one in ten households; long-stayers (30 years or more) 21%. The benchmark for households without a car in the typical compared French town: 11%. Longnes has more second homes than 74% of compared French towns, at 4.4%. Here 7.8% of homes stand empty, where the figure in the typical compared French town is 6.7%.
Median standard of living: €29,780 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.
The midpoint of living standards here is €29,780 a year per consumption unit, higher than in 83% of compared French towns.
Households headed by a retired person: 27%, a lower share than 77% 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
Households headed by a manager or professional: 13%, above 71% of compared French towns. For Longnes, the census puts households headed by a manual worker at 18%. By way of comparison, 32% of households are headed by a retired person in the typical compared French town.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
A smaller share of immigrants than 60% of compared French towns: 5.3%
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.
Where 4.3% of residents are foreign nationals in the typical compared French town, Longnes has 3.2%. The share of immigrants in the typical compared French town is 6.5%. The median compared commune in Yvelines has 15%; immigrants here make up a share lower than in three fifths of compared French towns.
INSEE publishes no country of birth or ethnicity by commune in these tables, and the census doesn’t ask about religion.
Longnes sits below 93% of compared French towns for single residents (20%)
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
49% 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 72% of compared French towns: 15%
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 Longnes, 32% of adults out of school hold a higher-education qualification, beside 30% in the typical compared French town. Against that, 19% of adults out of school have no qualification in the typical compared French town.
Ranked by age, 3rd 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.
At the ends of the range sit Villejust (37.2), the youngest, and Prayssac (62.3), the oldest.
2 of 6 neighbors are older than Longnes
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Longnes | 40.2 | 14% | 4.4% | 5.3% |
| Rosny-sur-Seine 7,328 · 5.6 mi | 37 | 14% | 1.1% | 20% |
| Magnanville 6,383 · 5.7 mi | 43.1 | 22% | 0.5% | 16% |
| Buchelay 3,360 · 5.9 mi | 38.3 | 18% | 1.5% | 16% |
| Ivry-la-Bataille 2,609 · 6.2 mi | 43.6 | 23% | 3.8% | 9.3% |
| Mantes-la-Ville 22,332 · 6.7 mi | 35.2 | 14% | 0.7% | 24% |
| Mantes-la-Jolie 43,526 · 7.2 mi | 35.1 | 15% | 0.5% | 30% |
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 Longnes
What is the population of Longnes?
1,601 at INSEE’s 2023 census, 9% more than in 2012 (1,464).
How old are Longnes’ residents?
The median age is 40.2, younger than 78% of compared French towns. 25% are under 18 and 14% 65 or older.
How many second homes are there in Longnes?
32, with occasional dwellings: 4.4% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Longnes?
INSEE counts 85 immigrants (born abroad, not French at birth), 5.3% of residents, and 51 foreign nationals (3.2%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Longnes?
€29,780 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.