Photo: Dolly28 · CC BY-SA 3.0A larger share of couples with children than 97% of compared French towns: 37%
With a median age of 40, Issou is younger than 79% of compared French towns. In 2023, the Census found 4,060 residents locally, living in 1,610 households. 5.9% of households have no car. The share of empty homes is 4.3%, against 6.7% in the typical compared French town.
Throughout this page, the Yvelines 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 Issou
A town of families
37% of households are couples with children and 11% single parents with children; 19% of residents are under 15. Households ↓
Fewer residents than in 2012
Issou had 4,455 residents at the 2012 census and 4,060 in 2023, down 9%: slower growth than in 96% of compared French towns. Population ↓
Immigrants
INSEE counts 600 immigrants in Issou (people born abroad who weren’t French at birth, whatever their nationality now): 15% of residents, against 15% for the median compared commune in Yvelines. 11% are foreign nationals. Immigrants and foreign nationals ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
Issou changed by −9% from 2012 to 2023, behind 96% 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
Between 2012 and 2017 the population moved −8%, then −1% to 2023. Over those years, the median Yvelines town changed +7% and the median compared French town +5%.
In Issou, 15% of residents are 65 or over, fewer than in 90% 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
■ Issou 40. The median compared French town: 44.
Where just over one in ten residents are 15 to 24 in the typical compared French town, Issou has 13%. The wider picture: 22% of residents are 65 or over in the typical compared French town.
Women and men · all residents
50% women, 50% men
About an even split. Median share of women: Yvelines 51.6%, France 51.8%.
A lower share of one-person households than 92% of compared French towns, at 26%
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 Yvelines median and the France median
Living alone · share
11% of households are single parents, against 10% in the typical compared French town. There are 2.5 people in the average household. As a yardstick, just over a third of households are one person living alone in the typical compared French town.
Issou sits below 84% of compared French towns for second homes (0.9%)
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 17, against 11% in the median compared French town. More households in social housing than in 62% of compared French towns: 15%. To put it in context, 2.1% of homes are second homes in the typical compared French town. In Issou, nearly a quarter of homes are flats.
The middle resident’s standard of living: €28,280 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 €28,280 a year per consumption unit and half below; the level is higher than in 73% of compared French towns. Poverty touches 10.0% of residents.
In Issou, 25% of households are headed by a retired person, fewer than in 82% 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, 11% of households are headed by a manager or professional here. Issou has more households headed by a manual worker than 67% of compared French towns, at 17%. The share of households headed by a retired person in the typical compared French town is 32%.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
Issou ranks above 86% of compared French towns on immigrants: 15%
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 is 11%, against 4.3% in the typical compared French town. As a yardstick, 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.
Married residents make up 47% in Issou, more than in 76% 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
The figure for single residents is 28% in Issou and 25% in the typical compared French town. As a yardstick, 43% of residents 15 and over are married in the typical compared French town.
Fewer adults with no qualification than 62% of compared French towns: 17%
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
Here 32% of adults out of school hold a higher-education qualification, where the figure in the typical compared French town is 30%. By way of comparison, 19% of adults out of school have no qualification in the typical compared French town.
The 4th youngest of 41 French towns of 4,029 to 4,091 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.
At the ends of the range sit Survilliers (35.6), the youngest, and Le Croisic (65.7), the oldest.
Issou 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 |
|---|---|---|---|---|
| Issou | 40 | 15% | 0.9% | 15% |
| Gargenville 7,869 · 0.8 mi | 39.6 | 18% | 0.8% | 13% |
| Porcheville 3,382 · 1.3 mi | 37.3 | 15% | 0.8% | 17% |
| Mézières-sur-Seine 3,923 · 2.1 mi | 38.8 | 14% | 1.4% | 11% |
| Épône 7,031 · 2.3 mi | 39.2 | 18% | 7.9% | 16% |
| Juziers 4,065 · 2.4 mi | 39.8 | 17% | 12% | 12% |
| Limay 17,885 · 2.6 mi | 35.2 | 13% | 0.6% | 23% |
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 Issou
What is the population of Issou?
4,060 at INSEE’s 2023 census, 9% fewer than in 2012 (4,455).
How old are Issou’s residents?
The median age is 40, younger than 79% of compared French towns. 23% are under 18 and 15% 65 or older.
How many second homes are there in Issou?
15, with occasional dwellings: 0.9% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Issou?
INSEE counts 630 immigrants (born abroad, not French at birth), 15% of residents, and 440 foreign nationals (11%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Issou?
€28,280 a year per consumption unit in 2023 (median of compared French towns €25,970); 10.0% 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 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.