Osny ranks above 91% of compared French towns on couples with children: 34%
Here 4.1% of homes stand empty, where the figure in the typical compared French town is 6.7%. About one in ten: that is how common households headed by a manual worker are in Osny (9.9%). Few places have as many flats: 41% here, more than in 64% of compared French towns. The 2023 Census counted 17,954 residents in 6,400 households.
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 Osny
Immigrants
INSEE counts 3,200 immigrants in Osny (people born abroad who weren’t French at birth, whatever their nationality now): 18% of residents, against 16% for the median compared commune in Val-d'Oise. 12% are foreign nationals. Immigrants and foreign nationals ↓
A town of families
34% of households are couples with children and 13% single parents with children; 20% of residents are under 15. Households ↓
A young town
Half of Osny’s residents are under 38.6 and half over; the median of compared French towns is 44. 20% are under 15 and 17% are 65 or older. Ages ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
+10% since 2012, a pace 68% 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
The median compared French town changed +5% over the same years, the median Val-d'Oise town +8%. The change was +3% from 2012 to 2017 and +6% from 2017 to 2023.
Osny is younger than 86% of compared French towns: a median age of 38.6
Shares of residents by age at the 2023 census.
Age groups · share of residents
Median age of the 3,798 compared French towns
■ Osny 38.6. The median compared French town: 44.
In the typical compared French town, 22% of residents are 65 or over; in Osny, 17%. About one in eight: that is how common residents aged 15 to 24 are in Osny (13%).
Women and men · all residents
49% women, 51% men
About 105 men for every 100 women. Median share of women: Val-d'Oise 51.5%, France 51.8%.
Below 89% of compared French towns: 27% of households are one person living alone
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
The average household has 2.6 people. 13% of households are single parents, more than in 83% of compared French towns. For one-person households, the comparison in the typical compared French town is 35%.
A higher share of households in social housing than 66% of compared French towns, at 16%
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
0.9% of homes are second homes, against 2.1% in the typical compared French town. The benchmark for households in social housing in the typical compared French town: 12%. Turnover: 8.6% of households moved in less than two years ago, and 18% have lived in their home 30 years or more. Households without a car are more common here than in 53% of compared French towns.
Per consumption unit, the median standard of living is €29,260 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 residents live in households above €29,260 a year per consumption unit and half below; the level is higher than in 80% of compared French towns. Poverty touches 14.0% of residents.
Osny: 20% of households are headed by a manager or professional, above 87% 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
Households headed by a retired person: 29%, below just over two thirds of compared French towns. For households headed by a manager or professional, the comparison in the typical compared French town is 9.4%.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
A higher share of immigrants than 90% of compared French towns, at 18%
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 tops 87% of compared French towns: 12%. The comparison figure for immigrants is 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.
31% of residents 15 and over are single, a share 83% of compared French towns don’t reach
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
The figure for married residents is 45% in Osny and 43% in the typical compared French town. For comparison, 25% of residents 15 and over are single in the typical compared French town.
More graduates of higher education than 65% of compared French towns: 34%
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 20% in Osny. Against that, 30% of adults out of school hold a higher-education qualification in the typical compared French town.
Among 41 French towns of 17,325 to 18,582 people, the 9th 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.
Ages run from 33.2 in Moissy-Cramayel to 59.7 in Sanary-sur-Mer.
No nearby town is as old as Osny
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Osny | 38.6 | 17% | 0.9% | 18% |
| Pontoise 31,970 · 1.5 mi | 34.2 | 13% | 2.2% | 23% |
| Cergy 70,906 · 1.6 mi | 30.4 | 9.1% | 4.4% | 30% |
| Saint-Ouen-l'Aumône 25,578 · 2.8 mi | 35.3 | 12% | 0.6% | 25% |
| Courdimanche 7,311 · 3 mi | 36 | 9.6% | 0.7% | 17% |
| Vauréal 16,079 · 3.1 mi | 36.6 | 12% | 1% | 16% |
| Éragny-sur-Oise 18,436 · 3.4 mi | 35.9 | 14% | 0.8% | 17% |
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 Osny
What is the population of Osny?
17,954 at INSEE’s 2023 census, 10% more than in 2012 (16,366).
How old are Osny’s residents?
The median age is 38.6, younger than 86% of compared French towns. 24% are under 18 and 17% 65 or older.
How many second homes are there in Osny?
61, with occasional dwellings: 0.9% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Osny?
INSEE counts 3,190 immigrants (born abroad, not French at birth), 18% of residents, and 2,180 foreign nationals (12%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Osny?
€29,260 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.