A median age of 38.2: Ermont is younger than 88% of compared French towns
The figure for empty homes is 3% in Ermont and 6.7% in the typical compared French town. Meanwhile, more single-parent households than in 84% of compared French towns: 13%. The town’s 12,720 households held 29,489 residents at the 2023 Census. For Ermont, the census puts households headed by a retired person at 26%.
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 Ermont
Immigrants
INSEE counts 5,700 immigrants in Ermont (people born abroad who weren’t French at birth, whatever their nationality now): 19% of residents, against 16% for the median compared commune in Val-d'Oise. 14% are foreign nationals. Immigrants and foreign nationals ↓
A young town
Half of Ermont’s residents are under 38.2 and half over; the median of compared French towns is 44. 20% are under 15 and 17% are 65 or older. Ages ↓
Social housing
31% of households rent from a social landlord (HLM), 18% rent privately and 50% own their home. Homes & cars ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
Ermont grew +8% from 2012 to 2023, faster than 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 the whole period the median compared French town changed +5%, and the median Val-d'Oise town +8%. The years 2012 to 2017 brought +6%; 2017 to 2023, +1%.
Residents aged 65 and over make up 17% in Ermont, less than in 83% 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
■ Ermont 38.2. The median compared French town: 44.
Just over one in ten residents are 15 to 24, more than in 56% of compared French towns. Set beside that, 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%.
Couples with children: 29%, a higher share than 69% 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
With one-person households at 37%, Ermont is ahead of 58% of compared French towns on that count. On average, 25% of households are couples with children in the typical compared French town. Each household has 2.3 people on average.
Ermont ranks above 93% of compared French towns on households in social housing: 31%
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
Compared with 30% in the typical compared French town, 72% of homes are flats here. The usual figure: just over one in ten households rent social housing (HLM) in the typical compared French town. Households without a car account for 24%. 0.8% of homes are second homes, fewer than in 87% of compared French towns.
A median standard of living of €27,950 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.
The median standard of living in Ermont is €27,950 a year per consumption unit: higher than in 70% of compared French towns. Poverty touches 17.6% of residents.
21% of households are headed by a manager or professional, more than in 89% 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
In the typical compared French town, the share of households headed by a manual worker is 14%; Ermont has 9.8%. Across the comparison, 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).
In Ermont, 19% of residents are immigrants, more than in 92% 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 median compared commune in Val-d'Oise has 16%; immigrants here make up a share higher than in 92% of compared French towns. Foreign nationals account for 14%. In the typical compared French town, immigrants come to 6.5%.
INSEE publishes no country of birth or ethnicity by commune in these tables, and the census doesn’t ask about religion.
Ermont ranks above 83% of compared French towns on single residents: 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
Just over two in five residents 15 and over are married, against 43% in the typical compared French town. In the typical compared French town, single residents come to 25%.
Ermont ranks above 87% of compared French towns on graduates of higher education: 44%
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
Census figures put adults with no qualification at 18% in Ermont. Elsewhere, 30% of adults out of school hold a higher-education qualification in the typical compared French town.
Among 41 French towns of 28,046 to 31,148 people, the 16th 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.
Clichy-sous-Bois is the youngest (30.5); Agde the oldest (56.2).
Median age: 5 of the 6 towns around Ermont are older
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Ermont | 38.2 | 17% | 0.8% | 19% |
| Eaubonne 26,211 · 1 mi | 38.7 | 16% | 1.5% | 18% |
| Le Plessis-Bouchard 8,518 · 1.1 mi | 40.6 | 17% | 0.9% | 11% |
| Sannois 26,924 · 1.1 mi | 38.2 | 15% | 0.9% | 20% |
| Franconville 37,754 · 1.2 mi | 36.6 | 15% | 0.9% | 19% |
| Saint-Prix 7,612 · 1.3 mi | 43 | 19% | 0.8% | 13% |
| Margency 3,012 · 1.6 mi | 42 | 19% | 1% | 13% |
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 Ermont
What is the population of Ermont?
29,489 at INSEE’s 2023 census, 8% more than in 2012 (27,352).
How old are Ermont’s residents?
The median age is 38.2, younger than 88% of compared French towns. 24% are under 18 and 17% 65 or older.
How many second homes are there in Ermont?
110, with occasional dwellings: 0.8% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Ermont?
INSEE counts 5,730 immigrants (born abroad, not French at birth), 19% of residents, and 4,270 foreign nationals (14%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Ermont?
€27,950 a year per consumption unit in 2023 (median of compared French towns €25,970); 17.6% 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.