Couples with children: 36%, a higher share than 95% of compared French towns
In the typical compared French town, 32% of households are headed by a retired person; in Four, 20%. The 2023 Census put the town’s population at 1,673, in 690 households. The share of residents aged 65 and over stands at 13%. Lower than in 86% of compared French towns: 4.1% of homes stand empty.
Throughout this page, the Isère 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 Four
Growing fast
Four had 1,204 residents at the 2012 census and 1,673 in 2023, up 39%: faster growth than in 99% of compared French towns. Population ↓
A town of families
36% of households are couples with children and 8% single parents with children; 22% of residents are under 15. Households ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
Since 2012, Four has grown +39%, faster than 99% 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
From 2012 to 2017 the change was +24%; from 2017 to 2023, +12%. Over the same years the median compared French town changed +5%, the median Isère town +7%.
Half of Four is under 39.4, younger than 82% 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
■ Four 39.4. The median compared French town: 44.
Residents aged 15 to 24: 9.1%, below nearly four fifths of compared French towns.
Women and men · all residents
51% women, 49% men
About an even split. Median share of women: Isère 51.3%, France 51.8%.
A smaller share of one-person households than 86% of compared French towns: 28%
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 Isère median and the France median
Living alone · share
A household here holds 2.4 people on average. Four has fewer single-parent households than four fifths of compared French towns, at 8%. One-person households make up 35% in the typical compared French town.
Households without a car: 2.5%, a lower share than 99% of compared French towns
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
17% of households have been in place 30 years or more; 9.2% moved in within the last two years. Lower than in 78% of compared French towns: 6.7% of households rent social housing (HLM). The share of households without a car in the typical compared French town is 11%. By its share of flats (21%), Four is below nearly two thirds of compared French towns.
The middle resident’s standard of living: €31,400 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 €31,400 a year per consumption unit and half below; the level is higher than in 89% of compared French towns.
A higher share of households headed by a manager or professional than 75% of compared French towns, at 15%
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
At 14%, the share of households headed by a manual worker is lower than in 50% of compared French towns. In the typical compared French town, households headed by a manager or professional come to 9.4%.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
Immigrants make up 3.9% in Four, less than in 74% 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 share of foreign nationals is 1.9%, against 4.3% in the typical compared French town. On average, 6.5% of residents are immigrants in the typical compared French town. The median compared commune in Isère has 8%; immigrants here make up a share lower than in 74% of compared French towns.
INSEE publishes no country of birth or ethnicity by commune in these tables, and the census doesn’t ask about religion.
A lower share of single residents than 93% of compared French towns, at 20%
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
With married residents at 49%, Four is ahead of 87% of compared French towns on that count. Typically, a quarter of residents 15 and over are single in the typical compared French town.
Four sits below 91% of compared French towns for adults with no qualification (11%)
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
Set against 30% in the typical compared French town, 43% of adults out of school hold a higher-education qualification in Four. As a yardstick, nearly a fifth of adults out of school have no qualification in the typical compared French town.
Ranked by age, 2nd 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.
At the ends of the range sit Villejust (37.2), the youngest, and Prayssac (62.3), the oldest.
Four and its 6 nearest towns: 1 of them 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 |
|---|---|---|---|---|
| Four | 39.4 | 13% | 2.2% | 3.9% |
| Villefontaine 19,445 · 2.4 mi | 34.5 | 12% | 1% | 17% |
| L'Isle-d'Abeau 17,515 · 2.8 mi | 33.3 | 8.9% | 0.6% | 12% |
| Bourgoin-Jallieu 30,151 · 4.1 mi | 37.9 | 18% | 1.9% | 17% |
| La Verpillière 7,786 · 4.3 mi | 37.7 | 17% | 1.2% | 15% |
| Diémoz 2,947 · 4.7 mi | 42.6 | 21% | 1% | 4% |
| Saint-Quentin-Fallavier 6,189 · 5 mi | 38.4 | 17% | 1.1% | 11% |
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 Four
What is the population of Four?
1,673 at INSEE’s 2023 census, 39% more than in 2012 (1,204).
How old are Four’s residents?
The median age is 39.4, younger than 82% of compared French towns. 26% are under 18 and 13% 65 or older.
How many second homes are there in Four?
16, with occasional dwellings: 2.2% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Four?
INSEE counts 65 immigrants (born abroad, not French at birth), 3.9% of residents, and 32 foreign nationals (1.9%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Four?
€31,400 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.