A smaller share of households without a car than 99% of compared French towns: 1.7%
Where just over a third of households are one person living alone in the typical compared French town, Mortefontaine has 25%. This Oise town is home to 834 residents in 350 households, by the 2023 Census. Households headed by a retired person account for 21%. On empty homes, Mortefontaine sits higher than 84% of compared French towns: 11%.
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.
Mortefontaine changed by ±0% from 2012 to 2023, behind 72% 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 median Oise town changed +2% and the median compared French town +5%; here the first five years brought +2% and the next six −2%.
A lower share of residents aged 65 and over than 86% of compared French towns, at 16%
Shares of residents by age at the 2023 census.
Age groups · share of residents
Median age of the 3,798 compared French towns
■ Mortefontaine 45.8. The median compared French town: 44.
With a median age of 45.8, Mortefontaine is older than 62% of compared French towns. About one in 11: that is how common residents aged 15 to 24 are in Mortefontaine (9.1%). Elsewhere, 22% of residents are 65 or over in the typical compared French town.
Women and men · all residents
49% women, 51% men
About an even split. Median share of women: Oise 51.7%, France 51.8%.
Mortefontaine ranks below 99% of compared French towns on single-parent households: 4.6%
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
With couples with children at 33%, Mortefontaine is ahead of 87% of compared French towns on that count. As a reference point, 10% of households are single parents in the typical compared French town. There are 2.4 people in the average household.
A larger share of second homes than 74% of compared French towns: 4.5%
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
Households in social housing are rarer here than in 99% of compared French towns. The benchmark for second homes in the typical compared French town: 2.1%. On the census count, 19% of homes are flats.
A typical living standard of €33,400 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.
Living standards centre on €33,400 a year per consumption unit: higher than in 94% of compared French towns.
In Mortefontaine, 21% of households are headed by a manager or professional, more than in 89% 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
Set against 14% in the typical compared French town, 16% of households are headed by a manual worker in Mortefontaine. The share of households headed by a manager or professional in the typical compared French town is 9.4%.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
Immigrants: 11%, a higher share than 73% 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.
Compared with 4.3% in the typical compared French town, nearly one in ten residents are foreign nationals here. As a reference point, 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.
More married residents than 86% of compared French towns: 49%
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
With single residents at 23%, Mortefontaine is behind nearly three quarters of compared French towns on that count. The benchmark for married residents in the typical compared French town: 43%.
Mortefontaine: 45% of adults out of school hold a higher-education qualification, above 88% 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 adults with no qualification is 12%, against 19% in the typical compared French town. By way of comparison, 30% of adults out of school hold a higher-education qualification in the typical compared French town.
41 French towns of 834 to 2,582 people: this is the 20th oldest
The 40 compared French towns nearest in population, by median age. Hover for each one’s second homes and immigrants; click for its page.
Villejust is the youngest (37.2); Prayssac the oldest (62.3).
No nearby town is as old as Mortefontaine
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Mortefontaine | 45.8 | 16% | 4.5% | 11% |
| Saint-Witz 2,724 · 2.2 mi | 40.9 | 16% | 0.9% | 14% |
| Survilliers 4,091 · 2.9 mi | 35.6 | 13% | 1.2% | 14% |
| Moussy-le-Neuf 3,253 · 3.2 mi | 39.6 | 13% | 2.4% | 7.7% |
| Vémars 3,124 · 3.3 mi | 35.8 | 12% | 1.9% | 13% |
| La Chapelle-en-Serval 3,084 · 3.4 mi | 38.2 | 12% | 1.9% | 8.6% |
| Othis 6,717 · 3.9 mi | 39.5 | 14% | 0.7% | 8.6% |
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 Mortefontaine
What is the population of Mortefontaine?
834 at INSEE’s 2023 census, about the same as in 2012 (838).
How old are Mortefontaine’s residents?
The median age is 45.8, older than 62% of compared French towns. 24% are under 18 and 16% 65 or older.
How many second homes are there in Mortefontaine?
19, with occasional dwellings: 4.5% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Mortefontaine?
INSEE counts 89 immigrants (born abroad, not French at birth), 11% of residents, and 71 foreign nationals (8.5%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Mortefontaine?
€33,400 a year per consumption unit in 2023 (median of compared French towns €25,970). 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 4, 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.