Saint-Gratien sits below 99% of compared French towns for flats (0.5%)
In Saint-Gratien, 0.6% of households rent social housing (HLM), beside 12% in the typical compared French town. Locally, 1.3% of households have no car. Few places have so few one-person households: 23% here, fewer than in 97% of compared French towns. The 2023 Census counted 383 residents in 160 households.
Throughout this page, the Somme 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.
Saint-Gratien’s population moved +4% on 2012, less than in 55% 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 +2%, and from 2017 to 2023 +2%; the median compared French town changed +5% and the median Somme town −3%.
Saint-Gratien sits above 61% of compared French towns for residents aged 65 and over (24%)
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 43.6. The median compared French town: 44.
The median age in Saint-Gratien is 43.6, lower than in 53% of compared French towns. 11% of residents are 15 to 24, or about one in nine. Measured more widely, 22% of residents are 65 or over in the typical compared French town.
Women and men · all residents
48% women, 52% men
About 108 men for every 100 women. Median share of women: Somme 52.5%, France 51.8%.
Saint-Gratien sits above 99% of compared French towns for single-parent households (19%)
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 Somme median and the France median
Living alone · share
Couples with children: 31%, above 79% of compared French towns. Households here average 2.4 people each. The usual figure: one in ten households are single parents in the typical compared French town.
Fewer empty homes than 86% of compared French towns: 4.1%
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
30% of households have been in place 30 years or more; 9.4% moved in within the last two years. On second homes, Saint-Gratien sits higher than 72% of compared French towns: 4.1%. To put it in context, 6.7% of homes stand empty in the typical compared French town.
At the median, €27,700 a year to live on
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.
Per consumption unit, half of residents live on more than €27,700 a year: higher than in 68% of compared French towns.
Below 94% of compared French towns: 5.9% of households are headed by a manual worker
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
By its share of households headed by a manager or professional (20%), Saint-Gratien is above 88% of compared French towns. Across the comparison, 14% of households are headed by a manual worker in the typical compared French town. Households headed by a retired person: 36% of the total.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
A lower share of immigrants than 99% of compared French towns, at 1.1%
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.
0.5% of residents are foreign nationals, against 4.3% in the typical compared French town. In the typical compared French town, the share of immigrants is 6.5%.
INSEE publishes no country of birth or ethnicity by commune in these tables, and the census doesn’t ask about religion.
21% of residents 15 and over are single, fewer than in 87% of compared French towns
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 the typical compared French town, 43% of residents 15 and over are married; in Saint-Gratien, 45%. For single residents, the comparison in the typical compared French town is 25%.
Adults with no qualification: 10%, a lower share than 94% 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
Set against 30% in the typical compared French town, 37% of adults out of school hold a higher-education qualification in Saint-Gratien. As a reference point, nearly a fifth of adults out of school have no qualification in the typical compared French town.
The 15th youngest of 41 French towns of 383 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.
Ages run from 37.2 in Villejust to 62.3 in Prayssac.
Saint-Gratien sits below 4 of its 6 closest neighbors on median age
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
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?
383 at INSEE’s 2023 census, 4% more than in 2012 (370).
How old are Saint-Gratien’s residents?
The median age is 43.6, younger than 53% of compared French towns. 23% are under 18 and 24% 65 or older.
How many second homes are there in Saint-Gratien?
7, with occasional dwellings: 4.1% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Saint-Gratien?
INSEE counts 4 immigrants (born abroad, not French at birth), 1.1% of residents, and 2 foreign nationals (0.5%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Saint-Gratien?
€27,700 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 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.