Residents aged 15 to 24 make up 5.4% in Sermizelles, less than in 99% of compared French towns
Flats: 3.2% here and 30% in the typical compared French town. Couples with children are rarer here than in 90% of compared French towns. Sermizelles’s 130 households held 248 residents at the 2023 Census. For Sermizelles, the census puts households headed by a retired person at 39%.
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 Sermizelles
One home in five is a second home
The census counted 43 second homes and occasional dwellings in Sermizelles, 22% of its 200 homes: higher than in 94% of compared French towns. 95% of them are houses. Their owners live elsewhere, so they aren’t in the population figures on this page. Homes & cars ↓
Fewer residents than in 2012
Sermizelles had 288 residents at the 2012 census and 248 in 2023, down 14%: slower growth than in 99% of compared French towns. Population ↓
Empty homes
The census found 25 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.
In Sermizelles, 22% of homes are second homes, more than in 94% 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
Households without a car: 6.8% here and 11% in the typical compared French town. 13% of homes stand empty, or about one in eight. Set beside that, 2.1% of homes are second homes in the typical compared French town.
Slower growth than 99% of compared French towns: Sermizelles changed by −14% since 2012
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 −11% and the next six −3%.
Half of Sermizelles is over 50.1, older 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
■ Sermizelles 50.1. The median compared French town: 44.
Set against 22% in the typical compared French town, 27% of residents are 65 or over in Sermizelles.
Women and men · all residents
51% women, 49% men
About 94 men for every 100 women. Median share of women: Yonne 52.2%, France 51.8%.
Sermizelles ranks above 81% of compared French towns on one-person households: 44%
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
The typical household size is 1.9 people. As a yardstick, 35% of households are one person living alone in the typical compared French town. Single-parent households account for 8.1%.
The middle resident’s standard of living: €24,260 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.
Half of Sermizelles’ residents live in households with a standard of living below €24,260 a year per consumption unit, and half above: lower than in 68% of compared French towns.
Fewer households headed by a manager or professional than 57% of compared French towns: 8.3%
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
About one in eight: that is how common households headed by a manual worker are in Sermizelles (13%). In the typical compared French town, households headed by a manager or professional come to 9.4%.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
2% of residents are immigrants, below 91% 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.
Foreign nationals: 2.3%, below nearly three quarters of compared French towns. As a reference point, 6.5% of residents are immigrants in the typical compared French town.
INSEE publishes no country of birth or ethnicity by commune in these tables, and the census doesn’t ask about religion.
Fewer single residents than 81% of compared French towns: 22%
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
On the census count, 44% of residents 15 and over are married. Single residents: 25% in the typical compared French town, for comparison.
Graduates of higher education make up 19% in Sermizelles, less than in 89% 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
Here 23% of adults out of school have no qualification, where the figure in the typical compared French town is 19%. The usual figure: 30% of adults out of school hold a higher-education qualification in the typical compared French town.
Among 41 French towns of 248 to 2,582 people, the 14th 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.
Villejust is the youngest (37.2); Prayssac the oldest (62.3).
Nearby, 1 of 2 towns have older populations than Sermizelles
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 Sermizelles
What is the population of Sermizelles?
248 at INSEE’s 2023 census, 14% fewer than in 2012 (288).
How old are Sermizelles’ residents?
The median age is 50.1, older than 83% of compared French towns. 18% are under 18 and 27% 65 or older.
How many second homes are there in Sermizelles?
43, with occasional dwellings: 22% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Sermizelles?
INSEE counts 5 immigrants (born abroad, not French at birth), 2% of residents, and 6 foreign nationals (2.3%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Sermizelles?
€24,260 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 8, 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.