Photo: Velvet · CC BY-SA 3.0Younger than 92% of compared French towns: half of Mormant is under 36.8
In the typical compared French town, 12% of households rent social housing (HLM); in Mormant, 19%. By contrast, the town has fewer one-person households than 83% of compared French towns, at 28%. The 2023 Census counted 5,282 residents in 2,030 households. Census figures put households headed by a retired person at 24% locally.
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 Mormant
A town of families
37% of households are couples with children and 10% single parents with children; 23% of residents are under 15. Households ↓
A young town
Half of Mormant’s residents are under 36.8 and half over; the median of compared French towns is 44. 23% are under 15 and 14% are 65 or older. Ages ↓
Growing fast
Mormant had 4,503 residents at the 2012 census and 5,282 in 2023, up 17%: faster growth than in 86% of compared French towns. Population ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
Mormant grew +17% from 2012 to 2023, faster than 86% 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 change was +7% from 2012 to 2017 and +9% from 2017 to 2023. The median compared French town changed +5% over the same years, the median Seine-et-Marne town +8%.
Residents aged 65 and over: 14%, a lower share than 92% 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
■ Mormant 36.8. The median compared French town: 44.
Residents aged 15 to 24 make up 12%, against 11% in the typical compared French town. Across the comparison, 22% of residents are 65 or over in the typical compared French town.
Women and men · all residents
51% women, 49% men
About an even split. Median share of women: Seine-et-Marne 51.4%, France 51.8%.
Mormant ranks above 96% of compared French towns on couples with children: 37%
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
The typical household size is 2.6 people. As a reference point, a quarter of households are couples with children in the typical compared French town. Single-parent households come to 10% in Mormant, about one in ten.
In Mormant, 1.1% of homes are second homes, fewer than in 75% 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
30% of homes are flats in the typical compared French town, against 27% in Mormant. By way of comparison, 2.1% of homes are second homes in the typical compared French town. For Mormant, the census puts empty homes at 5.4%.
A typical living standard of €25,550 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 residents live in households above €25,550 a year per consumption unit and half below; the level is lower than in 54% of compared French towns. The share living below the poverty line is 14.0%.
In Mormant, 18% of households are headed by a manual worker, more than in 73% 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
Put another way, about one in 11: 9% of households are headed by a manager or professional. Measured more widely, 14% of households are headed by a manual worker in the typical compared French town.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
Immigrants make up 11% in Mormant, more than in 76% 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.
In the typical compared French town, the share of foreign nationals is 4.3%; Mormant has 7.9%. Across the comparison, 6.5% of residents are immigrants in the typical compared French town. The median compared commune in Seine-et-Marne has 14%; immigrants here make up a share higher than in 76% of compared French towns.
INSEE publishes no country of birth or ethnicity by commune in these tables, and the census doesn’t ask about religion.
Mormant: 27% of residents 15 and over are single, above 61% 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
In Mormant, 43% of residents 15 and over are married. The comparison figure for single residents is 25% in the typical compared French town.
A smaller share of graduates of higher education than 78% of compared French towns: 22%
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, nearly a fifth of adults out of school have no qualification; in Mormant, 23%. Graduates of higher education: 30% in the typical compared French town, for comparison.
The youngest of 41 French towns of 5,222 to 5,344 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 Mormant (36.8), the oldest Bretignolles-sur-Mer (62.9).
Median age: 4 of the 6 towns around Mormant are older
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Mormant | 36.8 | 14% | 1.1% | 11% |
| Verneuil-l'Étang 3,223 · 3.6 mi | 38.6 | 14% | 0.2% | 10% |
| Guignes 4,448 · 4.4 mi | 35.7 | 11% | 0.9% | 12% |
| Chaumes-en-Brie 3,503 · 4.6 mi | 38.5 | 14% | 2.8% | 9% |
| Rozay-en-Brie 2,860 · 6.2 mi | 41.5 | 19% | 1.2% | 7.7% |
| Nangis 8,867 · 6.8 mi | 36.6 | 16% | 1.5% | 20% |
| Fontenay-Trésigny 5,994 · 6.8 mi | 39.1 | 16% | 1.8% | 12% |
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 Mormant
What is the population of Mormant?
5,282 at INSEE’s 2023 census, 17% more than in 2012 (4,503).
How old are Mormant’s residents?
The median age is 36.8, younger than 92% of compared French towns. 27% are under 18 and 14% 65 or older.
How many second homes are there in Mormant?
25, with occasional dwellings: 1.1% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Mormant?
INSEE counts 600 immigrants (born abroad, not French at birth), 11% of residents, and 420 foreign nationals (7.9%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Mormant?
€25,550 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.