Photo: Rédacteur Tibet · CC BY-SA 3.0Half of Le Port-Marly is under 37.4, younger than 90% of compared French towns
45% of households are one person living alone; in the typical compared French town the figure is 35%. The census found that 29% of households are headed by a manager or professional in Le Port-Marly. Compared with other places, flats are common here: 80%, more than in 95% of compared French towns. The town counted 5,559 residents and 2,590 households at the 2023 Census.
Throughout this page, the Yvelines 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 Port-Marly
Immigrants
INSEE counts 1,300 immigrants in Le Port-Marly (people born abroad who weren’t French at birth, whatever their nationality now): 24% of residents, against 15% for the median compared commune in Yvelines. 22% are foreign nationals. Immigrants and foreign nationals ↓
A young town
Half of Le Port-Marly’s residents are under 37.4 and half over; the median of compared French towns is 44. 18% are under 15 and 15% are 65 or older. Ages ↓
Many graduates
51% of residents 15 and over who have left education hold a diploma above the bac, 23% a master’s or more (bac+5). Qualifications ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
Le Port-Marly grew +9% from 2012 to 2023, ahead of 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 those years, the median Yvelines town changed +7% and the median compared French town +5%.
15% of residents are 65 or over, below 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
■ Le Port-Marly 37.4. The median compared French town: 44.
13% of residents are 15 to 24; in the typical compared French town the figure is 11%. Measured more widely, 22% of residents are 65 or over in the typical compared French town.
Women and men · all residents
50% women, 50% men
About an even split. Median share of women: Yvelines 51.6%, France 51.8%.
A larger share of single-parent households than 81% of compared French towns: 12%
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 Yvelines median and the France median
Living alone · share
23% of households are couples with children, against 25% in the median compared French town; 12% are single parents with their children (10%). The typical household size is 2 people.
Households without a car: 24%, a higher share than 91% 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
Nothing unusual on second homes: 3%, close to the figure in the typical compared French town. On the census count, 4.6% of homes stand empty. Few places have as many households in social housing: 21% here, more than in 79% of compared French towns. In the typical compared French town, 11% of households have no car.
A median standard of living of €30,270 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 €30,270 a year per consumption unit: higher than in 86% of compared French towns. 15.0% of the population lives below the poverty line.
18% of households are headed by a retired person, fewer than in 97% 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
In the typical compared French town, 14% of households are headed by a manual worker; in Le Port-Marly, 7.3%. The share of households headed by a retired person in the typical compared French town is 32%.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
Le Port-Marly sits above 96% of compared French towns for immigrants (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.
With foreign nationals at 22%, Le Port-Marly is ahead of 97% of compared French towns on that count. Set beside that, 6.5% of residents are immigrants in the typical compared French town. The median compared commune in Yvelines has 15%; immigrants here make up a share higher than in 96% 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.
A higher share of single residents than 94% of compared French towns, at 36%
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%; Le Port-Marly has 35%. As a reference point, a quarter of residents 15 and over are single in the typical compared French town.
Le Port-Marly ranks above 93% of compared French towns on graduates of higher education: 51%
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 Le Port-Marly, 15% of adults out of school have no qualification, beside 19% in the typical compared French town. For comparison, 30% of adults out of school hold a higher-education qualification in the typical compared French town.
The youngest of 41 French towns of 5,489 to 5,630 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.
Ages run from 37.4 in Le Port-Marly to 60.8 in Penmarch.
No nearby town is as young as Le Port-Marly
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Le Port-Marly | 37.4 | 15% | 3% | 24% |
| Marly-le-Roi 16,756 · 0.8 mi | 44.3 | 21% | 1.7% | 13% |
| Le Pecq 16,059 · 1 mi | 42.5 | 19% | 1.1% | 17% |
| Louveciennes 7,990 · 1.1 mi | 43.3 | 22% | 2.8% | 21% |
| Croissy-sur-Seine 11,013 · 1.4 mi | 43.2 | 19% | 1.6% | 15% |
| Mareil-Marly 4,141 · 1.4 mi | 43.2 | 16% | 3.1% | 15% |
| Le Vésinet 15,554 · 1.5 mi | 44.5 | 21% | 1.8% | 14% |
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 Port-Marly
What is the population of Le Port-Marly?
5,559 at INSEE’s 2023 census, 9% more than in 2012 (5,089).
How old are Le Port-Marly’s residents?
The median age is 37.4, younger than 90% of compared French towns. 21% are under 18 and 15% 65 or older.
How many second homes are there in Le Port-Marly?
85, with occasional dwellings: 3% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Le Port-Marly?
INSEE counts 1,330 immigrants (born abroad, not French at birth), 24% of residents, and 1,200 foreign nationals (22%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Le Port-Marly?
€30,270 a year per consumption unit in 2023 (median of compared French towns €25,970); 15.0% 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.