Half of Saint-Gratien is under 38.6, younger than 86% of compared French towns
Households without a car make up 26%, against 11% in the typical compared French town. Here, just over a fifth of households rent social housing (HLM). More single-parent households than in 88% of compared French towns: 13%. Saint-Gratien counted 21,336 residents and 9,130 households at the 2023 Census.
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-Gratien
Immigrants
INSEE counts 5,000 immigrants in Saint-Gratien (people born abroad who weren’t French at birth, whatever their nationality now): 24% of residents, against 16% for the median compared commune in Val-d'Oise. 17% are foreign nationals. Immigrants and foreign nationals ↓
A young town
Half of Saint-Gratien’s residents are under 38.6 and half over; the median of compared French towns is 44. 20% are under 15 and 18% are 65 or older. Ages ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
A change of +2% since 2012 leaves Saint-Gratien behind 62% 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 those years, the median Val-d'Oise town changed +8% and the median compared French town +5%. Between 2012 and 2017 the population moved −1%, then +3% to 2023.
Fewer residents aged 65 and over than 78% of compared French towns: 18%
Shares of residents by age at the 2023 census.
Age groups · share of residents
Median age of the 3,798 compared French towns
■ Saint-Gratien 38.6. The median compared French town: 44.
The share of residents aged 15 to 24 stands at 11%. As a yardstick, 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: Val-d'Oise 51.5%, France 51.8%.
Saint-Gratien sits above 66% of compared French towns for couples with children (28%)
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
Where 35% of households are one person living alone in the typical compared French town, Saint-Gratien has 38%. Couples with children make up 25% in the typical compared French town. Households average 2.3 people.
Saint-Gratien ranks above 92% of compared French towns on flats: 75%
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
There is little gap on empty homes: 5.9%, about the same as in the typical compared French town. 1.9% of homes are second homes, fewer than in 53% of compared French towns. Measured more widely, 30% of homes are flats in the typical compared French town.
A median standard of living of €26,600 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.
Half of Saint-Gratien’s residents live in households with a standard of living below €26,600 a year per consumption unit, and half above: higher than in 57% of compared French towns. The share living below the poverty line is 18.2%.
In Saint-Gratien, 20% of households are headed by a manager or professional, more than in 88% 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
11% of households are headed by a manual worker; in the typical compared French town the figure is 14%. The share of households headed by a retired person stands at 26%. In the typical compared French town, nearly one in ten households are headed by a manager or professional.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
Saint-Gratien: 24% of residents are immigrants, above 96% 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 share of foreign nationals is 17%, against 4.3% in the typical compared French town. Immigrants make up 6.5% 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.
A higher share of single residents than 85% of compared French towns, at 32%
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
Married residents: just over two fifths of the total. As a yardstick, a quarter of residents 15 and over are single in the typical compared French town.
Graduates of higher education: 42%, a higher share than 84% 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
Few places have so few adults with no qualification: 19% here, fewer than in 53% of compared French towns. For comparison, 30% of adults out of school hold a higher-education qualification in the typical compared French town.
The 15th youngest of 41 French towns of 20,690 to 22,020 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.
Carrières-sous-Poissy is the youngest (32.6); Concarneau the oldest (53.9).
Around Saint-Gratien, 4 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-Gratien | 38.6 | 18% | 1.9% | 24% |
| Enghien-les-Bains 11,432 · 1 mi | 40.8 | 21% | 3.5% | 18% |
| Épinay-sur-Seine 52,833 · 1.4 mi | 34.5 | 13% | 1.2% | 36% |
| Sannois 26,924 · 1.5 mi | 38.2 | 15% | 0.9% | 20% |
| Soisy-sous-Montmorency 18,008 · 1.7 mi | 40.9 | 19% | 1.4% | 19% |
| Eaubonne 26,211 · 1.7 mi | 38.7 | 16% | 1.5% | 18% |
| Deuil-la-Barre 23,099 · 1.9 mi | 39.1 | 16% | 1% | 24% |
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-Gratien
What is the population of Saint-Gratien?
21,336 at INSEE’s 2023 census, 2% more than in 2012 (20,937).
How old are Saint-Gratien’s residents?
The median age is 38.6, younger than 86% of compared French towns. 24% are under 18 and 18% 65 or older.
How many second homes are there in Saint-Gratien?
190, with occasional dwellings: 1.9% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Saint-Gratien?
INSEE counts 5,020 immigrants (born abroad, not French at birth), 24% of residents, and 3,610 foreign nationals (17%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Saint-Gratien?
€26,600 a year per consumption unit in 2023 (median of compared French towns €25,970); 18.2% 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.