Le Mesnil-en-Thelle: 36% of households are couples with children, above 93% of compared French towns
5% of households have no car, against 11% in the typical compared French town. At 3.5%, the share of households in social housing is lower than in 92% of compared French towns. There were 1,010 households in Le Mesnil-en-Thelle at the 2023 Census, home to 2,439 residents. On the census count, 0.5% of homes are second homes.
Throughout this page, the Oise 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 Le Mesnil-en-Thelle
A town of families
36% of households are couples with children and 8.6% single parents with children; 20% of residents are under 15. Households ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
A +6% change since 2012: faster than 56% 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
Against +5% for the median compared French town and +2% for the median Oise town, the change came in two steps: −3% from 2012 to 2017, then +9% to 2023.
Younger than 73% of compared French towns: half of Le Mesnil-en-Thelle is under 41
Shares of residents by age at the 2023 census.
Age groups · share of residents
Median age of the 3,798 compared French towns
■ Le Mesnil-en-Thelle 41. The median compared French town: 44.
19% of residents are 65 or over; in the typical compared French town the figure is 22%. The share of residents aged 15 to 24 stands at 9.7%.
Women and men · all residents
50% women, 50% men
About an even split. Median share of women: Oise 51.7%, France 51.8%.
A smaller share of one-person households than 88% of compared French towns: 27%
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 Oise median and the France median
Living alone · share
Single-parent households: 8.6%, below 73% of compared French towns. The wider picture: 35% of households are one person living alone in the typical compared French town.
Flats make up 18% in Le Mesnil-en-Thelle, less than in 72% 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
6.7% of homes stand empty in the typical compared French town, against 4.9% in Le Mesnil-en-Thelle. Typically, 30% of homes are flats in the typical compared French town.
Median standard of living: €29,180 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 Le Mesnil-en-Thelle’s residents live in households with a standard of living below €29,180 a year per consumption unit, and half above: higher than in 80% of compared French towns. Poverty touches 8.0% of residents.
A larger share of households headed by a manager or professional than 77% of compared French towns: 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
Households headed by a manual worker: 12%, below 63% of compared French towns. In the typical compared French town, households headed by a manager or professional come to 9.4%. Here, 31% 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).
Immigrants make up 6.2% of Le Mesnil-en-Thelle’s residents
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 median compared commune in Oise has 7.4%; immigrants here make up a share lower than in 53% of compared French towns. Foreign nationals account for 3.7%.
INSEE publishes no country of birth or ethnicity by commune in these tables, and the census doesn’t ask about religion.
47% of residents 15 and over are married, a share 80% of compared French towns don’t reach
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
Against a figure of 25% in the typical compared French town, the share of single residents in Le Mesnil-en-Thelle comes in at 22%. By way of comparison, 43% of residents 15 and over are married in the typical compared French town.
Adults with no qualification: 17%, a lower share than 61% of compared French towns
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
The share of graduates of higher education stands at 30%. In the typical compared French town, adults with no qualification come to 19%.
The 4th youngest of 41 French towns of 2,439 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.
At the ends of the range sit Villejust (37.2), the youngest, and Prayssac (62.3), the oldest.
No nearby town is as old as Le Mesnil-en-Thelle
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Le Mesnil-en-Thelle | 41 | 19% | 0.5% | 6.2% |
| Bernes-sur-Oise 2,684 · 1.2 mi | 37.8 | 14% | 0.4% | 15% |
| Chambly 9,959 · 1.7 mi | 40.1 | 17% | 0.9% | 8.6% |
| Persan 14,359 · 1.7 mi | 32.9 | 10% | 0.3% | 27% |
| Beaumont-sur-Oise 10,232 · 2.4 mi | 36.4 | 14% | 1.4% | 19% |
| Bruyères-sur-Oise 4,921 · 2.6 mi | 35.2 | 9.7% | 0.6% | 13% |
| Champagne-sur-Oise 5,036 · 3.3 mi | 39.3 | 15% | 1% | 9.2% |
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 Le Mesnil-en-Thelle
What is the population of Le Mesnil-en-Thelle?
2,439 at INSEE’s 2023 census, 6% more than in 2012 (2,296).
How old are Le Mesnil-en-Thelle’s residents?
The median age is 41, younger than 73% of compared French towns. 23% are under 18 and 19% 65 or older.
How many second homes are there in Le Mesnil-en-Thelle?
5, with occasional dwellings: 0.5% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Le Mesnil-en-Thelle?
INSEE counts 150 immigrants (born abroad, not French at birth), 6.2% of residents, and 91 foreign nationals (3.7%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Le Mesnil-en-Thelle?
€29,180 a year per consumption unit in 2023 (median of compared French towns €25,970); 8.0% 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.