Photo: Rcsmit · CC BY-SA 3.0A median age of 33.5: Serris is younger than 98% of compared French towns
The figure for households headed by a retired person is 12% in Serris and 32% in the typical compared French town. The 2023 Census counted 10,326 residents in 4,440 households. On the census count, 25% of households have no car. 82% of homes are flats, a higher share than in 95% of compared French towns.
Throughout this page, the Seine-et-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 Serris
One home in five is a second home
The census counted 1,110 second homes and occasional dwellings in Serris, 18% of its 6,070 homes: higher than in 93% of compared French towns. 1.9% of them are houses. Their owners live elsewhere, so they aren’t in the population figures on this page. Homes & cars ↓
A young town
Half of Serris’ residents are under 33.5 and half over; the median of compared French towns is 44. 20% are under 15 and 9.7% are 65 or older. Ages ↓
Immigrants
INSEE counts 2,300 immigrants in Serris (people born abroad who weren’t French at birth, whatever their nationality now): 23% of residents, against 14% for the median compared commune in Seine-et-Marne. 16% are foreign nationals. Immigrants and foreign nationals ↓
Growing fast
Serris had 8,117 residents at the 2012 census and 10,326 in 2023, up 27%: faster growth than in 95% of compared French towns. Population ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
A larger share of second homes than 93% of compared French towns: 18%
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 make up 15%, against 12% in the typical compared French town. The benchmark for second homes in the typical compared French town: 2.1%. The share of empty homes stands at 8.6%.
From 2012 to 2023, Serris outgrew 95% of compared French towns: +27%
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
Here the change came as +11% to 2017, then +14% to 2023. Medians for comparison: +5% across compared French towns, +8% in Seine-et-Marne.
A smaller share of residents aged 65 and over than 99% of compared French towns: 9.7%
Shares of residents by age at the 2023 census.
Age groups · share of residents
Median age of the 3,798 compared French towns
■ Serris 33.5. The median compared French town: 44.
The share of residents aged 15 to 24 is 16%, against 11% in the typical compared French town. The wider picture: 22% of residents are 65 or over in the typical compared French town.
Women and men · all residents
52% women, 48% men
About 92 men for every 100 women. Median share of women: Seine-et-Marne 51.4%, France 51.8%.
A higher share of single-parent households than 92% of compared French towns, at 14%
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 Seine-et-Marne median and the France median
Living alone · share
Compared with 35% in the typical compared French town, 37% of households are one person living alone here. For comparison, 10% of households are single parents in the typical compared French town. About one in four: that is how common couples with children are in Serris (27%).
A median standard of living of €28,350 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.
Half of residents live in households above €28,350 a year per consumption unit and half below; the level is higher than in 74% of compared French towns. Poverty touches 13.0% of residents.
Above 94% of compared French towns: 25% of households are headed by a manager or professional
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
Households headed by a manual worker: 7.1% here and 14% in the typical compared French town. As a reference point, 9.4% of 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).
23% of residents are immigrants, more than in 95% 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.
With foreign nationals at 16%, Serris is ahead of 93% of compared French towns on that count. The share of immigrants in the typical compared French town is 6.5%.
INSEE publishes no country of birth or ethnicity by commune in these tables, and the census doesn’t ask about religion.
Serris: 38% of residents 15 and over are single, above 96% 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
With married residents at 36%, Serris is behind 88% of compared French towns on that count. For single residents, the comparison in the typical compared French town is 25%.
Below 95% of compared French towns: 10% of adults out of school have no qualification
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
30% of adults out of school hold a higher-education qualification in the typical compared French town, against 49% in Serris. For adults with no qualification, the comparison in the typical compared French town is 19%.
The youngest of 41 French towns of 10,160 to 10,493 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.
Serris is the youngest (33.5); Fouesnant the oldest (57).
Serris sits below 4 of its 6 closest neighbors on median age
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Serris | 33.5 | 9.7% | 18% | 23% |
| Bailly-Romainvilliers 6,980 · 1.7 mi | 34.9 | 7% | 32% | 17% |
| Chessy 7,771 · 1.7 mi | 33 | 7.5% | 7.4% | 21% |
| Montévrain 15,687 · 1.7 mi | 32.8 | 6.3% | 10% | 16% |
| Magny-le-Hongre 9,060 · 1.8 mi | 34.9 | 6.6% | 4% | 19% |
| Chanteloup-en-Brie 4,130 · 2.1 mi | 36.5 | 13% | 0.7% | 12% |
| Montry 3,945 · 3.2 mi | 39.9 | 15% | 1.6% | 10% |
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 Serris
What is the population of Serris?
10,326 at INSEE’s 2023 census, 27% more than in 2012 (8,117).
How old are Serris’ residents?
The median age is 33.5, younger than 98% of compared French towns. 24% are under 18 and 9.7% 65 or older.
How many second homes are there in Serris?
1,110, with occasional dwellings: 18% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Serris?
INSEE counts 2,330 immigrants (born abroad, not French at birth), 23% of residents, and 1,640 foreign nationals (16%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Serris?
€28,350 a year per consumption unit in 2023 (median of compared French towns €25,970); 13.0% 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.