Households in social housing: 29%, a higher share than 91% of compared French towns
Here 0.6% of homes are second homes, where the figure in the typical compared French town is 2.1%. Census day 2023: 11,995 residents and 5,400 households in Marly. Single-parent households account for 14%. The median age here is 39.3, lower than in 83% of compared French towns.
Throughout this page, the Nord 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 Marly
Social housing
29% of households rent from a social landlord (HLM), 20% rent privately and 50% own their home. Homes & cars ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
Marly’s population moved +5% on 2012, less than in 50% 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 years 2012 to 2017 brought +4%; 2017 to 2023, +1%.
A smaller share of residents aged 65 and over than 66% of compared French towns: 20%
Shares of residents by age at the 2023 census.
Age groups · share of residents
Median age of the 3,798 compared French towns
■ Marly 39.3. The median compared French town: 44.
Compared with 11% in the typical compared French town, just over one in ten residents are 15 to 24 here. On average, 22% of residents are 65 or over in the typical compared French town.
Women and men · all residents
54% women, 46% men
About 85 men for every 100 women. Median share of women: Nord 51.9%, France 51.8%.
In Marly, 39% of households are one person living alone, more than in 67% 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 Nord median and the France median
Living alone · share
Households average 2.2 people. The usual figure: just over a third of households are one person living alone in the typical compared French town. Lower than in 55% of compared French towns: 24% of households are couples with children.
Marly sits above 81% of compared French towns for households without a car (19%)
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
13% of households arrived within the last two years, while 21% have stayed 30 years or more. The wider picture: just over one in ten households have no car in the typical compared French town. On flats, Marly sits higher than 53% of compared French towns: 32%. There is little gap on empty homes: 6.2%, about the same as in the typical compared French town.
Half of residents have a standard of living above €22,190 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 €22,190 a year per consumption unit: lower than in 87% of compared French towns. Poverty touches 22.0% of residents.
Marly: 17% of households are headed by a manual worker, above 70% 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
30% of households are headed by a retired person; in the typical compared French town the figure is 32%. By way of comparison, 14% of households are headed by a manual worker in the typical compared French town. Households headed by a manager or professional make up about one in 12 here (8.1%).
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
Marly ranks above 70% of compared French towns on foreign nationals: 7%
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, 6.5% of residents are immigrants; in Marly, 8.5%. Immigrants make up a share higher than in 63% of compared French towns; the median compared commune in Nord has 4.1%. Against that, 4.3% of residents are foreign nationals 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.
Only 38% of residents 15 and over are married in Marly
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
28% of residents 15 and over are single; in the typical compared French town the figure is 25%. Married residents: 43% in the typical compared French town, for comparison.
A higher share of adults with no qualification than 58% of compared French towns, at 21%
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
28% of Marly’s residents 15 and over who have left education hold a higher-education diploma, against 30% in the median compared French town; 21% have no diploma (19%).
9th lowest median age among 41 French towns of 11,698 to 12,301
The 40 compared French towns nearest in population, by median age. Hover for each one’s second homes and immigrants; click for its page.
Dugny is the youngest (31.9); Saint-Cyprien the oldest (61.1).
Older than Marly: 3 of the 6 towns nearby
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Marly | 39.3 | 20% | 0.6% | 8.5% |
| Aulnoy-lez-Valenciennes 7,080 · 1.3 mi | 35.9 | 19% | 0.8% | 7.9% |
| Valenciennes 43,468 · 1.5 mi | 36.4 | 17% | 3% | 11% |
| Saint-Saulve 10,947 · 1.9 mi | 44 | 23% | 0.7% | 6.3% |
| Anzin 13,183 · 2.6 mi | 37.2 | 15% | 1.3% | 8.8% |
| Trith-Saint-Léger 6,019 · 2.6 mi | 40.6 | 20% | 1.2% | 4.5% |
| La Sentinelle 3,103 · 2.8 mi | 42.1 | 20% | 1.9% | 5.6% |
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 Marly
What is the population of Marly?
11,995 at INSEE’s 2023 census, 5% more than in 2012 (11,449).
How old are Marly’s residents?
The median age is 39.3, younger than 83% of compared French towns. 23% are under 18 and 20% 65 or older.
How many second homes are there in Marly?
35, with occasional dwellings: 0.6% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Marly?
INSEE counts 1,020 immigrants (born abroad, not French at birth), 8.5% of residents, and 840 foreign nationals (7%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Marly?
€22,190 a year per consumption unit in 2023 (median of compared French towns €25,970); 22.0% 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 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.