Photo: Poudou99 · CC BY 4.0A median age of 30.7: Lieusaint is younger than 99% of compared French towns
Compared with 6.7% in the typical compared French town, 3.3% of homes stand empty here. The 2023 Census put Lieusaint’s population at 14,017, in 5,470 households. 57% of homes are flats. More households headed by a manager or professional than in 82% of compared French towns: 17%.
Throughout this page, the Seine-et-Marne 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 Lieusaint
A young town
Half of Lieusaint’s residents are under 30.7 and half over; the median of compared French towns is 44. 23% are under 15 and 7.4% are 65 or older. Ages ↓
Growing fast
Lieusaint had 10,508 residents at the 2012 census and 14,017 in 2023, up 33%: faster growth than in 98% of compared French towns. Population ↓
Immigrants
INSEE counts 2,600 immigrants in Lieusaint (people born abroad who weren’t French at birth, whatever their nationality now): 19% of residents, against 14% for the median compared commune in Seine-et-Marne. 12% are foreign nationals. Immigrants and foreign nationals ↓
A town of families
34% of households are couples with children and 12% single parents with children; 23% of residents are under 15. Households ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
Lieusaint grew +33% from 2012 to 2023, faster than 98% 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 population moved +26%, and from 2017 to 2023 +5%; the median compared French town changed +5% and the median Seine-et-Marne town +8%.
A lower share of residents aged 65 and over than 99% of compared French towns, at 7.4%
Shares of residents by age at the 2023 census.
Age groups · share of residents
Median age of the 3,798 compared French towns
■ Lieusaint 30.7. The median compared French town: 44.
Residents aged 15 to 24: 17%, above 98% of compared French towns. 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: Seine-et-Marne 51.4%, France 51.8%.
Couples with children: 34%, a higher share than 90% 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 Seine-et-Marne median and the France median
Living alone · share
Set against 10% in the typical compared French town, just over one in ten households are single parents in Lieusaint. Typically, a quarter of households are couples with children in the typical compared French town. The average household has 2.5 people.
Lieusaint: 23% of households rent social housing (HLM), above 84% 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
Turnover: 15% of households moved in less than two years ago, and 6.7% have lived in their home 30 years or more. The benchmark for households in social housing in the typical compared French town: 12%. Higher than in 79% of compared French towns: 18% of households have no car. What’s more, 2.1% of homes are second homes in the typical compared French town, against 4.8% in Lieusaint.
€27,000 a year is the median standard of living here
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 €27,000 a year per consumption unit and half below; the level is higher than in 61% of compared French towns. Living below the poverty line: 14.0% of residents.
14% of households are headed by a retired person, fewer than in 99% 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 manual worker: 15% of the total. 17% of Lieusaint’s households are headed by a manager or professional, against 9.4% in the median compared French town; 14% by a retired person (32%).
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
In Lieusaint, 19% of residents are immigrants, more than in 91% 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.
With foreign nationals at 12%, Lieusaint is ahead of 87% of compared French towns on that count. By way of comparison, 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.
Above 95% of compared French towns: 37% of residents 15 and over are single
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
39% of residents 15 and over are married, against 43% in the typical compared French town. In the typical compared French town, single residents come to 25%.
Lieusaint sits above 74% of compared French towns for graduates of higher education (38%)
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
Adults with no qualification: 15%, below 73% of compared French towns. Graduates of higher education: 30% in the typical compared French town, for comparison.
The 2nd youngest of 41 French towns of 13,627 to 14,425 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.
Fleury-Mérogis is the youngest (30.2); Douarnenez the oldest (55.6).
Every neighbor is older than Lieusaint
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Lieusaint | 30.7 | 7.4% | 4.8% | 19% |
| Moissy-Cramayel 18,511 · 1.7 mi | 33.2 | 9.6% | 1.1% | 22% |
| Tigery 4,333 · 1.9 mi | 33.7 | 7.8% | 0.2% | 11% |
| Combs-la-Ville 23,350 · 2.1 mi | 37.8 | 16% | 0.7% | 17% |
| Saint-Pierre-du-Perray 11,993 · 2.5 mi | 33.7 | 10% | 0.6% | 14% |
| Savigny-le-Temple 31,148 · 2.7 mi | 33.4 | 10% | 0.3% | 22% |
| Saint-Germain-lès-Corbeil 7,469 · 2.7 mi | 41.5 | 20% | 0.8% | 9.9% |
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 Lieusaint
What is the population of Lieusaint?
14,017 at INSEE’s 2023 census, 33% more than in 2012 (10,508).
How old are Lieusaint’s residents?
The median age is 30.7, younger than 99% of compared French towns. 28% are under 18 and 7.4% 65 or older.
How many second homes are there in Lieusaint?
290, with occasional dwellings: 4.8% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Lieusaint?
INSEE counts 2,610 immigrants (born abroad, not French at birth), 19% of residents, and 1,700 foreign nationals (12%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Lieusaint?
€27,000 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 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.