Below 99% of compared French towns: 0.6% of homes are flats
In the typical compared French town, the share of residents aged 15 to 24 is 11%; Marnay-sur-Seine has 5.1%. 16% of households are couples with children, a lower share than in 87% of compared French towns. There were 120 households locally at the 2023 Census, home to 234 residents. Households headed by a retired person make up about one in four here (25%).
Throughout this page, the Aube 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 Marnay-sur-Seine
One home in six is a second home
The census counted 31 second homes and occasional dwellings in Marnay-sur-Seine, 18% of its 180 homes: higher than in 92% of compared French towns. 100% of them are houses. Their owners live elsewhere, so they aren’t in the population figures on this page. Homes & cars ↓
An older town
Half of Marnay-sur-Seine’s residents are under 52.2 and half over; the median of compared French towns is 44. 27% are 65 or older (France median 22%), 7% 80 or older. Ages ↓
Empty homes
The census found 24 homes empty (13%): for sale, to let, awaiting work or simply unused. Homes & cars ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
18% of homes in Marnay-sur-Seine are second homes
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 without a car trails just over three quarters of compared French towns: 6.6%. Second homes: 2.1% in the typical compared French town, for comparison. For Marnay-sur-Seine, the census puts empty homes at 13%. Households in social housing are rarer here than in 99% of compared French towns.
Slower than most: +1% since 2012, behind 64% 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
Against +5% for the median compared French town and +2% for the median Aube town, the change came in two steps: −1% from 2012 to 2017, then +2% to 2023.
Marnay-sur-Seine is older than 89% of compared French towns: a median age of 52.2
Shares of residents by age at the 2023 census.
Age groups · share of residents
Median age of the 3,798 compared French towns
■ Marnay-sur-Seine 52.2. The median compared French town: 44.
Set against 22% in the typical compared French town, 27% of residents are 65 or over in Marnay-sur-Seine.
Women and men · all residents
53% women, 47% men
About 88 men for every 100 women. Median share of women: Aube 52.1%, France 51.8%. Women live longer than men, so towns with many older residents have more women.
A lower share of single-parent households than 99% of compared French towns, at 4%
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 Aube median and the France median
Living alone · share
42% of households are one person living alone; in the typical compared French town the figure is 35%. The usual figure: 10% of households are single parents in the typical compared French town. A household here holds 1.9 people on average.
Median standard of living: €25,260 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.
The midpoint of living standards here is €25,260 a year per consumption unit, lower than in 57% of compared French towns.
12% of households are headed by a manual worker, fewer than in 61% 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
On the census count, nearly one in ten households are headed by a manager or professional. To put it in context, 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).
Marnay-sur-Seine: 6.5% of residents are immigrants
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.
On the census count, 4.3% of residents are foreign nationals. That is higher than in 50% of compared French towns; the median compared commune in Aube has 9.2%.
INSEE publishes no country of birth or ethnicity by commune in these tables, and the census doesn’t ask about religion.
A lower share of married residents than 87% 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
The share of single residents stands at 24%. Set beside that, 43% of residents 15 and over are married in the typical compared French town.
In Marnay-sur-Seine, 36% of adults out of school hold a higher-education qualification, more than in 68% 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
Adults with no qualification come to 19% in Marnay-sur-Seine, about two in ten. Graduates of higher education make up 30% in the typical compared French town.
Ranked by age, 9th oldest of 41 French towns this size
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 Villejust (37.2), the oldest Prayssac (62.3).
Marnay-sur-Seine is older than every town around it
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Marnay-sur-Seine | 52.2 | 27% | 18% | 6.5% |
| Nogent-sur-Seine 5,537 · 2.8 mi | 42.5 | 22% | 6.5% | 13% |
| Villenauxe-la-Grande 2,605 · 5.5 mi | 41.3 | 22% | 3.5% | 9.4% |
| Romilly-sur-Seine 14,959 · 7.6 mi | 42.8 | 23% | 2.7% | 17% |
| Provins 11,632 · 12.5 mi | 41.9 | 22% | 2.5% | 17% |
| Sézanne 4,576 · 16.2 mi | 50.7 | 30% | 3% | 8.3% |
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 Marnay-sur-Seine
What is the population of Marnay-sur-Seine?
234 at INSEE’s 2023 census, 1% more than in 2012 (231).
How old are Marnay-sur-Seine’s residents?
The median age is 52.2, older than 89% of compared French towns. 15% are under 18 and 27% 65 or older.
How many second homes are there in Marnay-sur-Seine?
31, with occasional dwellings: 18% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Marnay-sur-Seine?
INSEE counts 15 immigrants (born abroad, not French at birth), 6.5% of residents, and 10 foreign nationals (4.3%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Marnay-sur-Seine?
€25,260 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 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.