A lower share of flats than 99% of compared French towns, at 0.7%
Households in social housing: 1.4%, below 98% of compared French towns. The 2023 Census put Saint-Gervais’s population at 878, in 370 households. Put another way, about one in 29: 3.5% of households have no car. The median age here is 47.9, higher than in 74% 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-Gervais
A town of families
35% of households are couples with children and 6.8% single parents with children; 17% of residents are under 15. Households ↓
Fewer residents than in 2012
Saint-Gervais had 959 residents at the 2012 census and 878 in 2023, down 8%: slower growth than in 95% of compared French towns. Population ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
A −8% change since 2012: slower than 95% 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 −4% to 2017, then −5% to 2023.
Only 9.1% of residents are 15 to 24 in Saint-Gervais
Shares of residents by age at the 2023 census.
Age groups · share of residents
Median age of the 3,798 compared French towns
■ Saint-Gervais 47.9. The median compared French town: 44.
A fifth of Saint-Gervais’ residents are 65 or older, against 15% in the median Val-d'Oise town and 22% in the median compared French town; 20% are under 18.
Women and men · all residents
50% women, 50% men
About an even split. Median share of women: Val-d'Oise 51.5%, France 51.8%.
35% of households are couples with children, more than in 93% of compared French towns
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
One-person households: 26% here and 35% in the typical compared French town. Across Saint-Gervais, 6.8% of households are single parents. Couples with children: 25% in the typical compared French town, for comparison.
More second homes than 80% of compared French towns: 6.1%
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
The share of empty homes trails 69% of compared French towns: 5.4%. In the typical compared French town, second homes come to 2.1%. 5.7% of households arrived within the last two years, while 27% have stayed 30 years or more.
Half above, half below €32,380 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.
The median standard of living in Saint-Gervais is €32,380 a year per consumption unit: higher than in 92% of compared French towns.
Saint-Gervais: 24% of households are headed by a manager or professional, above 93% 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%. At 28%, the share of households headed by a retired person is lower than in 72% of compared French towns. The comparison figure for households headed by a manager or professional is 9.4% in the typical compared French town.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
Immigrants make up 6.2% of Saint-Gervais’ residents
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.
Immigrants make up a share lower than in 52% of compared French towns; the median compared commune in Val-d'Oise has 16%. The census found that 3.7% of residents are foreign nationals in Saint-Gervais.
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 89% of compared French towns: 50%
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, the share of single residents is 25%; Saint-Gervais has 22%. By way of comparison, 43% of residents 15 and over are married in the typical compared French town.
In Saint-Gervais, 39% of adults out of school hold a higher-education qualification, more than in 77% 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
Adults with no qualification: 14% here and 19% in the typical compared French town. Measured more widely, 30% of adults out of school hold a higher-education qualification in the typical compared French town.
The 15th oldest of 41 French towns of 878 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.
The youngest is Villejust (37.2), the oldest Prayssac (62.3).
Saint-Gervais is older than every town around it
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Saint-Gervais | 47.9 | 20% | 6.1% | 6.2% |
| Magny-en-Vexin 5,779 · 1.3 mi | 41.6 | 18% | 1.5% | 11% |
| Gisors 12,410 · 7.7 mi | 43.3 | 22% | 2.3% | 9.2% |
| Vexin-sur-Epte 6,015 · 8.3 mi | 42.7 | 19% | 12% | 3.8% |
| Chaumont-en-Vexin 3,338 · 8.6 mi | 44.2 | 25% | 3.4% | 7.5% |
| Gasny 3,062 · 9.3 mi | 44.3 | 23% | 2% | 4.8% |
| Marines 3,594 · 9.7 mi | 39.7 | 17% | 1.9% | 6.4% |
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-Gervais
What is the population of Saint-Gervais?
878 at INSEE’s 2023 census, 8% fewer than in 2012 (959).
How old are Saint-Gervais’ residents?
The median age is 47.9, older than 74% of compared French towns. 20% are under 18 and 20% 65 or older.
How many second homes are there in Saint-Gervais?
26, with occasional dwellings: 6.1% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Saint-Gervais?
INSEE counts 55 immigrants (born abroad, not French at birth), 6.2% of residents, and 32 foreign nationals (3.7%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Saint-Gervais?
€32,380 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.