Younger than 93% of compared French towns: half of Poissy is under 36.6
Households without a car make up 26%, against 11% in the typical compared French town. 40,983 residents in 18,110 households: that is Poissy at the 2023 Census. For Poissy, the census puts households headed by a retired person at 23%. Compared with other places, flats are common here: 82%, more than in 96% 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 Poissy
Immigrants
INSEE counts 10,200 immigrants in Poissy (people born abroad who weren’t French at birth, whatever their nationality now): 25% of residents, against 15% for the median compared commune in Yvelines. 21% are foreign nationals. Immigrants and foreign nationals ↓
A young town
Half of Poissy’s residents are under 36.6 and half over; the median of compared French towns is 44. 21% are under 15 and 17% are 65 or older. Ages ↓
Social housing
29% of households rent from a social landlord (HLM), 27% rent privately and 42% own their home. Homes & cars ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
Poissy grew +9% from 2012 to 2023, faster than 66% 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
Here the change came as −1% to 2017, then +10% to 2023. Medians for comparison: +5% across compared French towns, +7% in Yvelines.
Residents aged 65 and over: 17%, a lower share than 84% 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
■ Poissy 36.6. The median compared French town: 44.
About one in ten: that is how common residents aged 15 to 24 are in Poissy (10%). As a reference point, 22% of residents are 65 or over in the typical compared French town.
Women and men · all residents
52% women, 48% men
About 91 men for every 100 women. Median share of women: Yvelines 51.6%, France 51.8%.
A higher share of single-parent households than 90% of compared French towns, at 14%
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 average household has 2.2 people. On one-person households, Poissy sits higher than two thirds of compared French towns: 39%. By way of comparison, 10% of households are single parents in the typical compared French town. Against a figure of 25% in the typical compared French town, the share of couples with children in Poissy comes in at 26%.
Households in social housing make up 29% in Poissy, more than in 92% 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
11% of households moved in less than two years ago; 13% have been in their home 30 years or more. The share of households in social housing in the typical compared French town is 12%. Compared with other places, empty homes are scarce here: 5.1%, fewer than in 73% of compared French towns. Second homes are about as common here as in the typical compared French town, at 1.3%.
Half above, half below €27,030 a year in 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.
At €27,030 a year per consumption unit, the median standard of living here is higher than in 61% of compared French towns. As for poverty, 18.0% of residents are below the line.
Households headed by a manager or professional make up 25% in Poissy, more than in 94% 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 manual worker: 9.9%, below 77% of compared French towns. The wider picture: 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).
Poissy sits above 96% of compared French towns for immigrants (25%)
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, Poissy has 21%. 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 higher than in 96% 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.
More single residents than 84% of compared French towns: 31%
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
Two in five residents 15 and over are married (typical compared French town: 43%). Single residents make up 25% in the typical compared French town.
Graduates of higher education: 45%, a higher share than 88% of compared French towns
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
Here, 19% of adults out of school have no qualification. The usual figure: 30% of adults out of school hold a higher-education qualification in the typical compared French town.
Of 41 French towns its size (38,324 to 44,002 people), the 12th youngest
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 Stains (32.4), the youngest, and La Ciotat (49.9), the oldest.
4 of 6 neighbors are older than Poissy
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Poissy | 36.6 | 17% | 1.3% | 25% |
| Carrières-sous-Poissy 20,825 · 1.2 mi | 32.6 | 9.1% | 1.9% | 27% |
| Chambourcy 5,847 · 1.6 mi | 44.4 | 20% | 1.8% | 16% |
| Villennes-sur-Seine 5,952 · 2.2 mi | 43 | 18% | 6.9% | 13% |
| Achères 22,241 · 2.6 mi | 35.7 | 12% | 0.7% | 23% |
| Saint-Germain-en-Laye 45,931 · 2.8 mi | 41.3 | 18% | 4.2% | 19% |
| Orgeval 7,252 · 3.1 mi | 41.1 | 16% | 1.7% | 10% |
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 Poissy
What is the population of Poissy?
40,983 at INSEE’s 2023 census, 9% more than in 2012 (37,597).
How old are Poissy’s residents?
The median age is 36.6, younger than 93% of compared French towns. 24% are under 18 and 17% 65 or older.
How many second homes are there in Poissy?
250, with occasional dwellings: 1.3% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Poissy?
INSEE counts 10,240 immigrants (born abroad, not French at birth), 25% of residents, and 8,710 foreign nationals (21%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Poissy?
€27,030 a year per consumption unit in 2023 (median of compared French towns €25,970); 18.0% 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 9, 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.