A median age of 53.5: Sergenon is older than 91% of compared French towns
Empty homes are rarer here than in 99% of compared French towns. At the 2023 Census Sergenon was home to 58 people in 27 households. Census figures put second homes at 6.8% in the town. Where 32% of households are headed by a retired person in the typical compared French town, Sergenon has 40%.
Throughout this page, the Jura 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 Sergenon
An older town
Half of Sergenon’s residents are under 53.5 and half over; the median of compared French towns is 44. 33% are 65 or older (France median 22%), 3.5% 80 or older. Ages ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
Sergenon’s population moved ±0% on 2012, less than in 70% 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
From 2012 to 2017 the population moved −10%, and from 2017 to 2023 +12%; the median compared French town changed +5% and the median Jura town −4%.
Residents aged 65 and over make up 33% in Sergenon, more than in 92% 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
■ Sergenon 53.5. The median compared French town: 44.
The share of residents aged 15 to 24 is 14%, against 11% in the typical compared French town. The usual figure: 22% of residents are 65 or over in the typical compared French town.
Women and men · all residents
46% women, 54% men
About 119 men for every 100 women. Median share of women: Jura 52.0%, France 51.8%.
A smaller share of one-person households than 99% of compared French towns: 20%
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 Jura median and the France median
Living alone · share
Compared with 25% in the typical compared French town, 20% of households are couples with children here. The share of one-person households in the typical compared French town is 35%. A household here holds 2.1 people on average.
Flats make up 3.5% in Sergenon, less than in 98% 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 in social housing are rarer here than in 99% of compared French towns. In the typical compared French town, 30% of homes are flats.
The largest group of households: retired (40%)
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 are rarer here than in 99% of compared French towns.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
A higher share of immigrants than 79% of compared French towns, at 12%
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 figure for foreign nationals is 11% in Sergenon and 4.3% in the typical compared French town. The median compared commune in Jura has 7.6%; immigrants here make up a share higher than in 79% of compared French towns. Set beside that, 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.
A larger share of married residents than 99% of compared French towns: 56%
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
Where 25% of residents 15 and over are single in the typical compared French town, Sergenon has 19%. The comparison figure for married residents is 43% in the typical compared French town.
Below 99% of compared French towns: 4.3% of adults out of school hold a higher-education 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
Adults with no qualification: 28% here and 19% in the typical compared French town. As a yardstick, 30% of adults out of school hold a higher-education qualification in the typical compared French town.
Among 41 French towns of 58 to 2,582 people, the 7th 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.
1 of 6 neighbors are older than Sergenon
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 Sergenon
What is the population of Sergenon?
58 at INSEE’s 2023 census, about the same as in 2012 (58).
How old are Sergenon’s residents?
The median age is 53.5, older than 91% of compared French towns. 14% are under 18 and 33% 65 or older.
How many second homes are there in Sergenon?
2, with occasional dwellings: 6.8% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Sergenon?
INSEE counts 7 immigrants (born abroad, not French at birth), 12% of residents, and 6 foreign nationals (11%). The medians of compared French towns are 6.5% and 4.3%.
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.