Conflans-sur-Seine ranks below 99% of compared French towns on flats: 0.8%
In the typical compared French town, the share of households headed by a retired person is 32%; Conflans-sur-Seine has 41%. The census found that 4.3% of households rent social housing (HLM) locally. 17% of households are couples with children, a lower share than in 84% of compared French towns. At the 2023 Census, 602 people lived here, in 290 households.
Throughout this page, the Marne 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 Conflans-sur-Seine
Fewer residents than in 2012
Conflans-sur-Seine had 674 residents at the 2012 census and 602 in 2023, down 11%: slower growth than in 98% of compared French towns. Population ↓
Empty homes
The census found 51 homes empty (14%): for sale, to let, awaiting work or simply unused. Homes & cars ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
A −11% change since 2012: slower than 98% 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 Marne town changed −2% and the median compared French town +5%; here the first five years brought −5% and the next six −6%.
Older than 74% of compared French towns: half of Conflans-sur-Seine is over 47.9
Shares of residents by age at the 2023 census.
Age groups · share of residents
Median age of the 3,798 compared French towns
■ Conflans-sur-Seine 47.9. The median compared French town: 44.
10% of residents are 15 to 24 (typical compared French town: 11%). Locally, 25% of residents are 65 or over.
Women and men · all residents
51% women, 49% men
About 96 men for every 100 women. Median share of women: Marne 52.7%, France 51.8%.
Conflans-sur-Seine: 40% of households are one person living alone, above 68% 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 Marne median and the France median
Living alone · share
In the typical compared French town, 10% of households are single parents; in Conflans-sur-Seine, 11%. Households average 2.1 people. Across the comparison, just over a third of households are one person living alone in the typical compared French town.
More empty homes than 93% of compared French towns: 14%
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
In the last two years, 8.2% of households moved in; at the other end, 24% have stayed 30 years or more. Higher than in 83% of compared French towns: 7.1% of homes are second homes. Across the comparison, 6.7% of homes stand empty in the typical compared French town. Households without a car: 6.4% here and 11% in the typical compared French town.
Median standard of living: €24,180 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 €24,180 a year per consumption unit: lower than in 69% of compared French towns.
A lower share of households headed by a manager or professional than 84% of compared French towns, at 5.2%
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
For Conflans-sur-Seine, the census puts households headed by a manual worker at 15%. The wider picture: nearly one in ten households are headed by a manager or professional in the typical compared French town.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
A smaller share of immigrants than 68% of compared French towns: 4.5%
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.
Here 2.8% of residents are foreign nationals, where the figure in the typical compared French town is 4.3%. Immigrants: 6.5% in the typical compared French town, for comparison.
INSEE publishes no country of birth or ethnicity by commune in these tables, and the census doesn’t ask about religion.
Single residents: 27%, a higher share than 64% of compared French towns
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
42% of residents 15 and over are married, against 43% in the typical compared French town. The share of single residents in the typical compared French town is 25%.
15% of adults out of school hold a higher-education qualification, below 98% 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
Compared with 19% in the typical compared French town, 22% of adults out of school have no qualification here. For graduates of higher education, the comparison in the typical compared French town is 30%.
Among 41 French towns of 602 to 2,582 people, the 15th 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.
At the ends of the range sit Villejust (37.2), the youngest, and Prayssac (62.3), the oldest.
Nearby, 1 of 5 towns have older populations than Conflans-sur-Seine
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Conflans-sur-Seine | 47.9 | 25% | 7.1% | 4.5% |
| Romilly-sur-Seine 14,959 · 3.5 mi | 42.8 | 23% | 2.7% | 17% |
| Villenauxe-la-Grande 2,605 · 6.2 mi | 41.3 | 22% | 3.5% | 9.4% |
| Nogent-sur-Seine 5,537 · 8.8 mi | 42.5 | 22% | 6.5% | 13% |
| Sézanne 4,576 · 11.8 mi | 50.7 | 30% | 3% | 8.3% |
| Provins 11,632 · 17.4 mi | 41.9 | 22% | 2.5% | 17% |
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 Conflans-sur-Seine
What is the population of Conflans-sur-Seine?
602 at INSEE’s 2023 census, 11% fewer than in 2012 (674).
How old are Conflans-sur-Seine’s residents?
The median age is 47.9, older than 74% of compared French towns. 19% are under 18 and 25% 65 or older.
How many second homes are there in Conflans-sur-Seine?
26, with occasional dwellings: 7.1% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Conflans-sur-Seine?
INSEE counts 27 immigrants (born abroad, not French at birth), 4.5% of residents, and 17 foreign nationals (2.8%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Conflans-sur-Seine?
€24,180 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.