A median age of 37.6: Thiais is younger than 90% of compared French towns
With households headed by a retired person at 22%, Thiais is behind 92% of compared French towns on that count. Flats: three quarters of the total. At 13%, the share of single-parent households is higher than in 89% of compared French towns. The town counted 32,918 residents and 14,400 households at the 2023 Census.
Throughout this page, the Val-de-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 Thiais
Immigrants
INSEE counts 7,800 immigrants in Thiais (people born abroad who weren’t French at birth, whatever their nationality now): 24% of residents, against 23% for the median compared commune in Val-de-Marne. 18% are foreign nationals. Immigrants and foreign nationals ↓
A young town
Half of Thiais’ residents are under 37.6 and half over; the median of compared French towns is 44. 19% are under 15 and 15% are 65 or older. Ages ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
Thiais’s population changed by +12% since 2012, more than in 75% 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
The first five years brought −1%; the six to 2023, +13%. For comparison, the median compared French town changed +5% and the median Val-de-Marne town +7%.
Only 15% of residents are 65 or over in Thiais
Shares of residents by age at the 2023 census.
Age groups · share of residents
Median age of the 3,798 compared French towns
■ Thiais 37.6. The median compared French town: 44.
Against a figure of 11% in the typical compared French town, the share of residents aged 15 to 24 in Thiais comes in at 12%. The usual figure: 22% of residents are 65 or over in the typical compared French town.
Women and men · all residents
53% women, 47% men
About 89 men for every 100 women. Median share of women: Val-de-Marne 52.1%, France 51.8%.
In Thiais, 39% of households are one person living alone, more than in 67% 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 Val-de-Marne median and the France median
Living alone · share
Average household size: 2.3 people. In the typical compared French town, just over a third of households are one person living alone. The share of couples with children is 27%, against 25% in the typical compared French town.
Households without a car make up 24% in Thiais, more than in 90% 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: 13% of households moved in less than two years ago, and 15% have lived in their home 30 years or more. In the typical compared French town, households without a car come to 11%. 3.9% of homes stand empty, a lower share than in 89% of compared French towns. Where 12% of households rent social housing (HLM) in the typical compared French town, Thiais has 19%.
The middle resident’s standard of living: €27,470 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 Thiais is €27,470 a year per consumption unit: higher than in 66% of compared French towns. One measure of hardship: 17.1% of residents are below the poverty line.
A higher share of households headed by a manager or professional than 86% of compared French towns, at 19%
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
The share of households headed by a manual worker is 12%, against 14% in the typical compared French town. Typically, 9.4% of households are headed by a manager or professional in the typical compared French town.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
A higher share of immigrants than 96% of compared French towns, at 24%
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.
Compared with 4.3% in the typical compared French town, 18% of residents are foreign nationals here. On average, 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.
A higher share of single residents than 91% of compared French towns, at 34%
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
In the typical compared French town, the share of married residents is 43%; Thiais has 40%. The usual figure: a quarter of residents 15 and over are single in the typical compared French town.
More graduates of higher education than 82% of compared French towns: 41%
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
Across Thiais, nearly a fifth of adults out of school have no qualification. The comparison figure for graduates of higher education is 30% in the typical compared French town.
41 French towns of 30,838 to 35,173 people: this is the 15th 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.
Trappes is the youngest (32.7); Aix-les-Bains the oldest (48.5).
A younger town than 2 of the 6 around it: Thiais
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Thiais | 37.6 | 15% | 1.8% | 24% |
| Choisy-le-Roi 45,946 · 1 mi | 36.4 | 13% | 1.9% | 29% |
| Orly 24,658 · 1.4 mi | 35.2 | 13% | 0.9% | 29% |
| Chevilly-Larue 19,826 · 1.5 mi | 38.6 | 16% | 2.3% | 23% |
| Vitry-sur-Seine 93,963 · 1.7 mi | 36.8 | 15% | 1.4% | 33% |
| Rungis 5,611 · 2.2 mi | 42.9 | 19% | 2.5% | 12% |
| Villejuif 60,183 · 2.4 mi | 35.3 | 13% | 4% | 29% |
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 Thiais
What is the population of Thiais?
32,918 at INSEE’s 2023 census, 12% more than in 2012 (29,422).
How old are Thiais’ residents?
The median age is 37.6, younger than 90% of compared French towns. 23% are under 18 and 15% 65 or older.
How many second homes are there in Thiais?
280, with occasional dwellings: 1.8% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Thiais?
INSEE counts 7,850 immigrants (born abroad, not French at birth), 24% of residents, and 5,950 foreign nationals (18%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Thiais?
€27,470 a year per consumption unit in 2023 (median of compared French towns €25,970); 17.1% 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.