44% of households are couples with children, more than in 99% of compared French towns
Compared with 11% in the typical compared French town, 2.5% of households have no car here. In 2023, the Census found 912 residents in Léaz, living in 340 households. The share of second homes stands at 7.4%. At 16%, the share of flats is lower than in 75% of compared French towns.
Throughout this page, the Ain 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 Léaz
A town of families
44% of households are couples with children and 10% single parents with children; 26% of residents are under 15. Households ↓
Growing fast
Léaz had 614 residents at the 2012 census and 912 in 2023, up 49%: faster growth than in 99% of compared French towns. Population ↓
A young town
Half of Léaz’s residents are under 36.4 and half over; the median of compared French towns is 44. 26% are under 15 and 9.9% are 65 or older. Ages ↓
Immigrants
INSEE counts 200 immigrants in Léaz (people born abroad who weren’t French at birth, whatever their nationality now): 17% of residents, against 8.5% for the median compared commune in Ain. 14% are foreign nationals. Immigrants and foreign nationals ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
Léaz’s population changed by +49% since 2012, more than in 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
Medians for comparison: +5% across compared French towns, +13% in Ain. Here the change came as +20% to 2017, then +23% to 2023.
A median age of 36.4: Léaz is younger than 93% 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
■ Léaz 36.4. The median compared French town: 44.
Residents aged 65 and over: 9.9% here and 22% in the typical compared French town. About one in 12: that is how common residents aged 15 to 24 are in Léaz (8.5%).
Women and men · all residents
50% women, 50% men
About an even split. Median share of women: Ain 51.0%, France 51.8%.
20% of households are one person living alone, below 99% 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 Ain median and the France median
Living alone · share
The average household has 2.6 people. On average, 35% of households are one person living alone in the typical compared French town. More single-parent households than in 55% of compared French towns: 10%.
84% of homes are houses
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
Empty homes account for 7.4%. Compared with other places, households in social housing are scarce here: 12%, fewer than in 53% of compared French towns.
Median living standard: €35,500 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 median standard of living in Léaz is €35,500 a year per consumption unit: higher than in 96% of compared French towns.
A lower share of households headed by a retired person than 99% of compared French towns, at 11%
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
A quarter of households are headed by a manual worker (typical compared French town: 14%). Across Léaz, one in ten households are headed by a manager or professional. In the typical compared French town, households headed by a retired person come to 32%.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
A higher share of immigrants than 89% of compared French towns, at 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.
In the typical compared French town, the share of foreign nationals is 4.3%; Léaz has 14%. Immigrants make up 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.
20% of residents 15 and over are single, fewer than in 89% 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
By its share of married residents (47%), Léaz is above 77% of compared French towns. Against that, 25% of residents 15 and over are single in the typical compared French town.
Below 78% of compared French towns: 14% of adults out of school have no 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
Graduates of higher education account for 31%. On average, nearly a fifth of adults out of school have no qualification in the typical compared French town.
The youngest of 41 French towns of 912 to 2,582 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.
The youngest is Léaz (36.4), the oldest Prayssac (62.3).
Léaz is younger than 4 of its 6 nearest neighbors
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Léaz | 36.4 | 9.9% | 7.4% | 17% |
| Valserhône 16,712 · 3.4 mi | 40.3 | 17% | 2.9% | 21% |
| Valleiry 5,264 · 4.4 mi | 36.8 | 11% | 5.2% | 26% |
| Péron 2,916 · 6.8 mi | 37.1 | 10% | 6.5% | 25% |
| Viry 5,809 · 7.6 mi | 35.9 | 12% | 6.4% | 26% |
| Saint-Julien-en-Genevois 16,222 · 10.2 mi | 35.4 | 13% | 5.7% | 30% |
| Thoiry 6,569 · 10.9 mi | 39 | 13% | 6.1% | 34% |
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 Léaz
What is the population of Léaz?
912 at INSEE’s 2023 census, 49% more than in 2012 (614).
How old are Léaz’s residents?
The median age is 36.4, younger than 93% of compared French towns. 30% are under 18 and 9.9% 65 or older.
How many second homes are there in Léaz?
30, with occasional dwellings: 7.4% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Léaz?
INSEE counts 160 immigrants (born abroad, not French at birth), 17% of residents, and 130 foreign nationals (14%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Léaz?
€35,500 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.