Photo: Christophe Godart · CC BY-SA 4.0A median age of 35.9: Éragny-sur-Oise is younger than 94% of compared French towns
Against a figure of 25% in the typical compared French town, the share of couples with children in Éragny-sur-Oise comes in at 32%. The town’s 7,270 households held 18,436 residents at the 2023 Census. The share of empty homes stands at 4%. On households in social housing, Éragny-sur-Oise sits higher than 88% of compared French towns: 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 Éragny-sur-Oise
A young town
Half of Éragny-sur-Oise’s residents are under 35.9 and half over; the median of compared French towns is 44. 23% are under 15 and 14% are 65 or older. Ages ↓
Immigrants
INSEE counts 3,200 immigrants in Éragny-sur-Oise (people born abroad who weren’t French at birth, whatever their nationality now): 17% of residents, against 16% for the median compared commune in Val-d'Oise. 12% are foreign nationals. Immigrants and foreign nationals ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
+9% since 2012, a pace 66% of compared French towns didn’t match
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 +3%, and from 2017 to 2023 +6%; the median compared French town changed +5% and the median Val-d'Oise town +8%.
A lower share of residents aged 65 and over than 92% of compared French towns, at 14%
Shares of residents by age at the 2023 census.
Age groups · share of residents
Median age of the 3,798 compared French towns
■ Éragny-sur-Oise 35.9. The median compared French town: 44.
Compared with 11% in the typical compared French town, just over one in ten residents are 15 to 24 here. The usual figure: 22% of residents are 65 or over in the typical compared French town.
Women and men · all residents
53% women, 47% men
About 90 men for every 100 women. Median share of women: Val-d'Oise 51.5%, France 51.8%.
Above 98% of compared French towns: 16% of households are single parents
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
A household here holds 2.5 people on average. Compared with other places, one-person households are scarce here: 30%, fewer than in 79% of compared French towns. In the typical compared French town, one in ten households are single parents.
A higher share of flats than 83% of compared French towns, at 59%
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
Without a car: one household in seven, against 11% in the median compared French town. In the typical compared French town, 30% of homes are flats. 15% of households have no car, or about one in seven. At 0.8%, the share of second homes is lower than in 86% of compared French towns.
A typical living standard of €27,610 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 midpoint of living standards here is €27,610 a year per consumption unit, higher than in 67% of compared French towns. As for poverty, 14.0% of residents are below the line.
23% of households are headed by a retired person, fewer than in 90% 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
Compared with 9.4% in the typical compared French town, 19% of households are headed by a manager or professional here. To put it in context, 32% of households are headed by a retired person in the typical compared French town. The share of households headed by a manual worker stands at 13%.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
Éragny-sur-Oise ranks above 89% of compared French towns on immigrants: 17%
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.
Set against 4.3% in the typical compared French town, just over one in ten residents are foreign nationals in Éragny-sur-Oise. Measured more widely, 6.5% of residents are immigrants 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.
In Éragny-sur-Oise, 31% of residents 15 and over are single, more than in 82% 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
Locally, 42% of residents 15 and over are married. The benchmark for single residents in the typical compared French town: 25%.
More graduates of higher education than 74% of compared French towns: 38%
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
At 18%, the share of adults with no qualification is lower than in 55% of compared French towns. As a yardstick, 30% of adults out of school hold a higher-education qualification in the typical compared French town.
Ranked by age, 4th youngest of 41 French towns this size
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 33.2 in Moissy-Cramayel to 59.7 in Sanary-sur-Mer.
Around Éragny-sur-Oise, 3 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 |
|---|---|---|---|---|
| Éragny-sur-Oise | 35.9 | 14% | 0.8% | 17% |
| Conflans-Sainte-Honorine 36,958 · 1.4 mi | 39.1 | 16% | 1.3% | 17% |
| Saint-Ouen-l'Aumône 25,578 · 1.7 mi | 35.3 | 12% | 0.6% | 25% |
| Pontoise 31,970 · 2.2 mi | 34.2 | 13% | 2.2% | 23% |
| Maurecourt 4,454 · 2.3 mi | 40.7 | 17% | 1.5% | 12% |
| Pierrelaye 10,130 · 2.5 mi | 35.2 | 12% | 0.8% | 20% |
| Herblay-sur-Seine 31,779 · 2.8 mi | 37.3 | 13% | 0.7% | 15% |
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 Éragny-sur-Oise
What is the population of Éragny-sur-Oise?
18,436 at INSEE’s 2023 census, 9% more than in 2012 (16,914).
How old are Éragny-sur-Oise’s residents?
The median age is 35.9, younger than 94% of compared French towns. 27% are under 18 and 14% 65 or older.
How many second homes are there in Éragny-sur-Oise?
64, with occasional dwellings: 0.8% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Éragny-sur-Oise?
INSEE counts 3,170 immigrants (born abroad, not French at birth), 17% of residents, and 2,270 foreign nationals (12%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Éragny-sur-Oise?
€27,610 a year per consumption unit in 2023 (median of compared French towns €25,970); 14.0% 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.