A larger share of couples with children than 93% of compared French towns: 35%
Set against 9.4% in the typical compared French town, nearly a quarter of households are headed by a manager or professional in Saint-Prix. This Val-d'Oise town is home to 7,612 residents in 2,890 households, by the 2023 Census. The census found that 13% of residents are 15 to 24 locally. Second homes are rarer here than in 88% of compared French towns.
Throughout this page, the Val-d'Oise 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-Prix
A town of families
35% of households are couples with children and 9.4% single parents with children; 18% of residents are under 15. Households ↓
Many graduates
48% of residents 15 and over who have left education hold a diploma above the bac, 20% a master’s or more (bac+5). Qualifications ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
A growing town: +6% since 2012, faster than 53% 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
Over the same years the median compared French town changed +5%, the median Val-d'Oise town +8%. From 2012 to 2017 the change was −1%; from 2017 to 2023, +6%.
In Saint-Prix, 19% of residents are 65 or over, fewer than in 71% 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-Prix 43. The median compared French town: 44.
Half of Saint-Prix’s residents are under 43, younger than in 58% of compared French towns. The wider picture: 22% of residents are 65 or over in the typical compared French town.
Women and men · all residents
51% women, 49% men
About an even split. Median share of women: Val-d'Oise 51.5%, France 51.8%.
Only 25% of households are one person living alone in Saint-Prix
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 Val-d'Oise median and the France median
Living alone · share
On single-parent households, 9.4% here is much the same as in the typical compared French town. Set beside that, 35% of households are one person living alone in the typical compared French town. The average household has 2.5 people.
More households in social housing than 58% of compared French towns: 14%
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
One household in 10 has no car (median compared French town: 11%). Compared with other places, empty homes are scarce here: 6%, fewer than in three fifths of compared French towns. Set beside that, 12% of households rent social housing (HLM) in the typical compared French town. Households without a car make up about one in ten here (9.6%).
The median resident lives on €35,550 a year per consumption unit
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-Prix’s residents live in households with a standard of living below €35,550 a year per consumption unit, and half above: higher than in 96% of compared French towns. Poverty touches 8.0% of residents.
A smaller share of households headed by a manual worker than 91% of compared French towns: 6.8%
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
The share of households headed by a retired person trails 72% of compared French towns: 29%. For comparison, 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).
13% of residents are immigrants, a share 82% of compared French towns don’t reach
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 Val-d'Oise has 16%; immigrants here make up a share higher than in just over four fifths of compared French towns. In the typical compared French town, the share of immigrants is 6.5%. Foreign nationals: 8.9% of the total.
INSEE publishes no country of birth or ethnicity by commune in these tables, and the census doesn’t ask about religion.
More married residents than 84% of compared French towns: 48%
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
28% of residents 15 and over are single; in the typical compared French town the figure is 25%. Married residents make up 43% in the typical compared French town.
Saint-Prix sits above 91% of compared French towns for graduates of higher education (48%)
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
By its share of adults with no qualification (14%), Saint-Prix is below 78% of compared French towns. The share of graduates of higher education in the typical compared French town is 30%.
The 10th youngest of 41 French towns of 7,509 to 7,713 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.
At the ends of the range sit Saint-Maixent-l'École (35.5), the youngest, and Céret (57), the oldest.
Around Saint-Prix, 1 of 6 towns have a higher 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-Prix | 43 | 19% | 0.8% | 13% |
| Saint-Leu-la-Forêt 16,138 · 0.9 mi | 41.7 | 18% | 0.7% | 12% |
| Montlignon 3,038 · 1 mi | 43.9 | 19% | 0.7% | 9.9% |
| Le Plessis-Bouchard 8,518 · 1.2 mi | 40.6 | 17% | 0.9% | 11% |
| Margency 3,012 · 1.3 mi | 42 | 19% | 1% | 13% |
| Ermont 29,489 · 1.3 mi | 38.2 | 17% | 0.8% | 19% |
| Eaubonne 26,211 · 1.4 mi | 38.7 | 16% | 1.5% | 18% |
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-Prix
What is the population of Saint-Prix?
7,612 at INSEE’s 2023 census, 6% more than in 2012 (7,214).
How old are Saint-Prix’s residents?
The median age is 43, younger than 58% of compared French towns. 22% are under 18 and 19% 65 or older.
How many second homes are there in Saint-Prix?
24, with occasional dwellings: 0.8% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Saint-Prix?
INSEE counts 1,020 immigrants (born abroad, not French at birth), 13% of residents, and 680 foreign nationals (8.9%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Saint-Prix?
€35,550 a year per consumption unit in 2023 (median of compared French towns €25,970); 8.0% 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.