Above 99% of compared French towns: 55% of households are couples with children
Just over one in ten households have no car in the typical compared French town, against 2.1% in Sancy. The town had 401 residents in 140 households at the 2023 Census. Residents aged 65 and over: 13% of the total. Compared with other places, empty homes are scarce here: 2.4%, fewer than in 98% 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 Sancy
A town of families
55% of households are couples with children and 3.7% single parents with children; 22% of residents are under 15. Households ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
A growing town: +6% since 2012, faster than 55% 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 Seine-et-Marne town changed +8% and the median compared French town +5%; here the first five years brought +1% and the next six +5%.
Half of Sancy is under 39.2, younger than 83% 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
■ Sancy 39.2. The median compared French town: 44.
On the census count, 10% of residents are 15 to 24.
Women and men · all residents
52% women, 48% men
About 91 men for every 100 women. Median share of women: Seine-et-Marne 51.4%, France 51.8%.
One-person households make up 12% in Sancy, less than in 99% 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 Seine-et-Marne median and the France median
Living alone · share
There are 2.9 people in the average household. 3.7% of households are single parents, a lower share than in 99% of compared French towns. Against that, 35% of households are one person living alone in the typical compared French town.
1.5% of homes are flats, fewer than in 99% 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
Recent arrivals (under two years) make up 4.3% of households; long-stayers (30 years or more) 20%. Fewer second homes than in 61% of compared French towns: 1.6%.
A median of €32,080 a year per consumption unit
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 Sancy’s residents live in households with a standard of living below €32,080 a year per consumption unit, and half above: higher than in 91% of compared French towns.
A larger share of households headed by a manager or professional than 97% of compared French towns: 31%
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
14% of households are headed by a manual worker in the typical compared French town, against 7.3% in Sancy. The share of households headed by a manager or professional in the typical compared French town is 9.4%. In Sancy, 26% of households are headed by a retired person.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
Above 59% of compared French towns: 7.8% 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.
The median compared commune in Seine-et-Marne has 14%; immigrants here make up a share higher than in 59% of compared French towns. Elsewhere, 6.5% of residents are immigrants in the typical compared French town. Here, 5% of residents are foreign nationals.
INSEE publishes no country of birth or ethnicity by commune in these tables, and the census doesn’t ask about religion.
Below 89% of compared French towns: 21% of residents 15 and over are single
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
44% of residents 15 and over are married, against 43% in the typical compared French town. For single residents, the comparison in the typical compared French town is 25%.
Sancy ranks below 98% of compared French towns on adults with no qualification: 8.5%
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
The figure for graduates of higher education is 34% in Sancy and 30% in the typical compared French town. Adults with no qualification: 19% in the typical compared French town, for comparison.
2nd lowest median age among 41 French towns of 401 to 2,582
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 37.2 in Villejust to 62.3 in Prayssac.
A younger town than 5 of the 6 around it: Sancy
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Sancy | 39.2 | 13% | 1.6% | 7.8% |
| Crécy-la-Chapelle 4,973 · 2.9 mi | 41.7 | 18% | 4% | 7.7% |
| Quincy-Voisins 5,547 · 4.3 mi | 39.7 | 15% | 2.5% | 8.1% |
| Nanteuil-lès-Meaux 7,308 · 4.4 mi | 36.3 | 14% | 1.8% | 11% |
| Guérard 2,688 · 4.4 mi | 39.6 | 16% | 4.5% | 6.5% |
| Trilport 5,146 · 5 mi | 39.9 | 16% | 0.7% | 13% |
| Saint-Germain-sur-Morin 3,902 · 5.2 mi | 39.4 | 14% | 1.8% | 7.8% |
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 Sancy
What is the population of Sancy?
401 at INSEE’s 2023 census, 6% more than in 2012 (379).
How old are Sancy’s residents?
The median age is 39.2, younger than 83% of compared French towns. 26% are under 18 and 13% 65 or older.
How many second homes are there in Sancy?
2, with occasional dwellings: 1.6% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Sancy?
INSEE counts 31 immigrants (born abroad, not French at birth), 7.8% of residents, and 20 foreign nationals (5%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Sancy?
€32,080 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.