More flats than 87% of compared French towns: 65%
By its share of households in social housing (17%), Illzach is above 69% of compared French towns. Across Illzach, 12% of residents are 15 to 24. Lower than in 78% of compared French towns: 1.1% of homes are second homes. At the 2023 Census, 14,923 people lived here, in 6,380 households.
Throughout this page, the Haut-Rhin 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 Illzach
Immigrants
INSEE counts 3,000 immigrants in Illzach (people born abroad who weren’t French at birth, whatever their nationality now): 20% of residents, against 10% for the median compared commune in Haut-Rhin. 13% are foreign nationals. Immigrants and foreign nationals ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
A +1% change since 2012: slower than 67% 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 Haut-Rhin town +4%.
Illzach is younger than 66% of compared French towns: a median age of 42
Shares of residents by age at the 2023 census.
Age groups · share of residents
Median age of the 3,798 compared French towns
■ Illzach 42. The median compared French town: 44.
Residents aged 65 and over account for 21%.
Women and men · all residents
51% women, 49% men
About an even split. Median share of women: Haut-Rhin 51.5%, France 51.8%.
Illzach: 37% of households are one person living alone, above 59% 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 Haut-Rhin median and the France median
Living alone · share
The average household has 2.3 people. For comparison, just over a third of households are one person living alone in the typical compared French town. Single-parent households make up 10%, close to the figure in the typical compared French town.
13% of households have no car, a share 63% of compared French towns don’t reach
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
The figure for empty homes is 7.8% in Illzach and 6.7% in the typical compared French town. For comparison, 11% of households have no car in the typical compared French town. Recent arrivals (under two years) make up nearly one in ten households; long-stayers (30 years or more) 18%.
Half of residents have a standard of living above €23,120 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 €23,120 a year per consumption unit, lower than in 81% of compared French towns. The poverty rate is 22.0%.
A larger share of households headed by a manual worker than 84% of compared French towns: 20%
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, 9.4% of households are headed by a manager or professional; in Illzach, 6.5%. The benchmark for households headed by a manual worker in the typical compared French town: 14%. Locally, nearly a third of households are headed by a retired person.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
20% of residents are immigrants, more than in 93% 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.
13% of residents are foreign nationals (typical compared French town: 4.3%). The benchmark for immigrants in the typical compared French town: 6.5%.
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 48% in Illzach, more than in 83% 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
27% of residents 15 and over are single; in the typical compared French town the figure is 25%. The comparison figure for married residents is 43% in the typical compared French town.
Below 76% of compared French towns: 23% of adults out of school hold a higher-education qualification
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
In the typical compared French town, 19% of adults out of school have no qualification; in Illzach, 24%. The usual figure: 30% of adults out of school hold a higher-education qualification in the typical compared French town.
41 French towns of 14,481 to 15,317 people: this is the 19th 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.
At the ends of the range sit Lognes (34.9), the youngest, and Saint-Jean-de-Luz (54.3), the oldest.
5 in 6 nearby towns have a higher median age than Illzach
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Illzach | 42 | 21% | 1.1% | 20% |
| Sausheim 5,666 · 1.1 mi | 48.3 | 26% | 1.3% | 11% |
| Kingersheim 13,354 · 1.7 mi | 46.2 | 25% | 0.2% | 13% |
| Riedisheim 12,200 · 1.9 mi | 50.5 | 28% | 0.9% | 9.6% |
| Mulhouse 104,978 · 1.9 mi | 37.8 | 17% | 2.1% | 27% |
| Baldersheim 2,596 · 2.3 mi | 47.2 | 24% | 2.8% | 6.2% |
| Pfastatt 10,314 · 2.5 mi | 42 | 23% | 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 Illzach
What is the population of Illzach?
14,923 at INSEE’s 2023 census, about the same as in 2012 (14,812).
How old are Illzach’s residents?
The median age is 42, younger than 66% of compared French towns. 23% are under 18 and 21% 65 or older.
How many second homes are there in Illzach?
74, with occasional dwellings: 1.1% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Illzach?
INSEE counts 2,970 immigrants (born abroad, not French at birth), 20% of residents, and 1,890 foreign nationals (13%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Illzach?
€23,120 a year per consumption unit in 2023 (median of compared French towns €25,970); 22.0% 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.