Montmagny is younger than 95% of compared French towns: a median age of 35.8
In Montmagny, 56% of homes are flats, beside 30% in the typical compared French town. At the 2023 Census Montmagny was home to 15,105 people in 5,530 households. On the census count, 0.9% of homes are second homes. Lower than in nearly two thirds of compared French towns: 32% of households are one person living alone.
Throughout this page, the Val-d'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 Montmagny
Immigrants
INSEE counts 4,500 immigrants in Montmagny (people born abroad who weren’t French at birth, whatever their nationality now): 29% of residents, against 16% for the median compared commune in Val-d'Oise. 20% are foreign nationals. Immigrants and foreign nationals ↓
A young town
Half of Montmagny’s residents are under 35.8 and half over; the median of compared French towns is 44. 22% are under 15 and 13% are 65 or older. Ages ↓
A town of families
36% of households are couples with children and 13% single parents with children; 22% of residents are under 15. Households ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
Montmagny grew +9% from 2012 to 2023, faster than 67% 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
Over the same years the median compared French town changed +5%, the median Val-d'Oise town +8%. From 2012 to 2017 the change was +3%; from 2017 to 2023, +7%.
A lower share of residents aged 65 and over than 96% of compared French towns, at 13%
Shares of residents by age at the 2023 census.
Age groups · share of residents
Median age of the 3,798 compared French towns
■ Montmagny 35.8. The median compared French town: 44.
With residents aged 15 to 24 at 14%, Montmagny is ahead of 94% of compared French towns on that count. For comparison, 22% of residents are 65 or over in the typical compared French town.
Women and men · all residents
51% women, 49% men
About 95 men for every 100 women. Median share of women: Val-d'Oise 51.5%, France 51.8%.
36% of households are couples with children, more than in 94% 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-d'Oise median and the France median
Living alone · share
The figure for single-parent households is 13% in Montmagny and 10% in the typical compared French town. The share of couples with children in the typical compared French town is 25%. Households here average 2.7 people each.
Montmagny ranks above 91% of compared French towns on households without a car: 25%
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
The share of households in social housing is 15%, against 12% in the typical compared French town. Households without a car: 11% in the typical compared French town, for comparison. In the last two years, 7.3% of households moved in; at the other end, 14% have stayed 30 years or more. Compared with other places, empty homes are scarce here: 6%, fewer than in three fifths of compared French towns.
Median standard of living: €23,890 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.
At €23,890 a year per consumption unit, the median standard of living here is lower than in 73% of compared French towns. Below the poverty line: 23.0% of residents.
A smaller share of households headed by a retired person than 92% of compared French towns: 22%
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
Compared with 9.4% in the typical compared French town, 16% of households are headed by a manager or professional here. For comparison, nearly a third of households are headed by a retired person in the typical compared French town. 15% of households are headed by a manual worker, or about one in seven.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
A larger share of immigrants than 98% of compared French towns: 29%
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.
By its share of foreign nationals (20%), Montmagny is above 96% of compared French towns. The median compared commune in Val-d'Oise has 16%; immigrants here make up a share higher than in 98% of compared French towns. The benchmark for immigrants in the typical compared French town: 6.5%.
INSEE publishes no country of birth or ethnicity by commune in these tables, and the census doesn’t ask about religion.
Montmagny sits above 93% of compared French towns for single residents (35%)
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
43% of residents 15 and over are married in the typical compared French town, against 45% in Montmagny. The comparison figure for single residents is 25% in the typical compared French town.
More adults with no qualification than 78% of compared French towns: 25%
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 make up 34%, against 30% in the typical compared French town. In the typical compared French town, the share of adults with no qualification is 19%.
Of 41 French towns its size (14,718 to 15,554 people), the 4th 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.
At the ends of the range sit Lognes (34.9), the youngest, and Saint-Jean-de-Luz (54.3), the oldest.
Montmagny sits below 4 of its 6 closest neighbors on median age
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Montmagny | 35.8 | 13% | 0.9% | 29% |
| Deuil-la-Barre 23,099 · 0.8 mi | 39.1 | 16% | 1% | 24% |
| Villetaneuse 12,530 · 0.9 mi | 33.2 | 12% | 0.6% | 38% |
| Groslay 8,453 · 1.2 mi | 37.9 | 14% | 0.8% | 16% |
| Enghien-les-Bains 11,432 · 1.6 mi | 40.8 | 21% | 3.5% | 18% |
| Montmorency 21,763 · 1.7 mi | 41.4 | 19% | 2.1% | 17% |
| Épinay-sur-Seine 52,833 · 1.7 mi | 34.5 | 13% | 1.2% | 36% |
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 Montmagny
What is the population of Montmagny?
15,105 at INSEE’s 2023 census, 9% more than in 2012 (13,814).
How old are Montmagny’s residents?
The median age is 35.8, younger than 95% of compared French towns. 26% are under 18 and 13% 65 or older.
How many second homes are there in Montmagny?
52, with occasional dwellings: 0.9% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Montmagny?
INSEE counts 4,450 immigrants (born abroad, not French at birth), 29% of residents, and 2,970 foreign nationals (20%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Montmagny?
€23,890 a year per consumption unit in 2023 (median of compared French towns €25,970); 23.0% 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.