37% of homes are second homes, a share 96% of compared French towns don’t reach
Households in social housing are rarer here than in 99% of compared French towns. In 2023, the Census found 388 residents in Sommecaise, living in 190 households. For Sommecaise, the census puts households without a car at 4.9%. Where one in ten households are single parents in the typical compared French town, Sommecaise has 2.8%.
Throughout this page, the Yonne 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 Sommecaise
One home in three is a second home
The census counted 120 second homes and occasional dwellings in Sommecaise, 37% of its 320 homes: higher than in 96% 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 ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
In Sommecaise, 0.6% 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
Empty homes: 4.4% here and 6.7% in the typical compared French town. By way of comparison, 30% of homes are flats in the typical compared French town.
A +12% change since 2012: faster than 75% 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 Yonne town changed −4% and the median compared French town +5%; here the first five years brought +6% and the next six +5%.
Below 94% of compared French towns: 7.8% of residents are 15 to 24
Shares of residents by age at the 2023 census.
Age groups · share of residents
Median age of the 3,798 compared French towns
■ Sommecaise 45.1. The median compared French town: 44.
Residents aged 65 and over: 21%, below nearly three fifths of compared French towns. Meanwhile, with a median age of 45.1, Sommecaise is older than 58% of compared French towns. The usual figure: 11% of residents are 15 to 24 in the typical compared French town.
Women and men · all residents
49% women, 51% men
About an even split. Median share of women: Yonne 52.2%, France 51.8%.
One-person households: 39%, a higher share than 65% 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 Yonne median and the France median
Living alone · share
Average household size: 2.1 people. Compared with other places, couples with children are scarce here: 25%, fewer than in just over half of compared French towns. In the typical compared French town, one-person households come to 35%.
A typical living standard of €24,160 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 €24,160 a year per consumption unit, lower than in 69% of compared French towns.
Households headed by a manager or professional: 5.6%, a lower share than 80% 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
20% of households are headed by a manual worker (typical compared French town: 14%). On average, 9.4% of households are headed by a manager or professional in the typical compared French town. Households headed by a retired person: a third of the total.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
Only 1% of residents are immigrants in Sommecaise
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 Yonne has 9.2%; immigrants here make up a share lower than in 99% of compared French towns. Set beside that, 6.5% of residents are immigrants in the typical compared French town. The census found that 0.8% of residents are foreign nationals in Sommecaise.
INSEE publishes no country of birth or ethnicity by commune in these tables, and the census doesn’t ask about religion.
38% of residents 15 and over are married, fewer than in 79% 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
The share of single residents is 24%, against 25% in the typical compared French town. Set beside that, 43% of residents 15 and over are married in the typical compared French town.
A smaller share of graduates of higher education than 59% of compared French towns: 27%
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 share of adults with no qualification is 21%, against 19% in the typical compared French town. As a reference point, 30% of adults out of school hold a higher-education qualification in the typical compared French town.
20th lowest median age among 41 French towns of 388 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.
Of the 6 towns nearest Sommecaise, 5 are older
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
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 Sommecaise
What is the population of Sommecaise?
388 at INSEE’s 2023 census, 12% more than in 2012 (347).
How old are Sommecaise’s residents?
The median age is 45.1, older than 58% of compared French towns. 21% are under 18 and 21% 65 or older.
How many second homes are there in Sommecaise?
120, with occasional dwellings: 37% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Sommecaise?
INSEE counts 4 immigrants (born abroad, not French at birth), 1% of residents, and 3 foreign nationals (0.8%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Sommecaise?
€24,160 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 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.