Older than 98% of compared French towns: half of Mailly-le-Château is over 60.4
The share of single-parent households is 15%, against 10% in the typical compared French town. Lower than in 99% of compared French towns: 1.3% of homes are flats. Mailly-le-Château is home to 514 residents in 230 households, by the 2023 Census. On the census count, 13% of households are headed by a manager or professional.
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 Mailly-le-Château
One home in three is a second home
The census counted 130 second homes and occasional dwellings in Mailly-le-Château, 29% of its 450 homes: higher than in 95% of compared French towns. 99% of them are houses. Their owners live elsewhere, so they aren’t in the population figures on this page. Homes & cars ↓
An older town
Half of Mailly-le-Château’s residents are under 60.4 and half over; the median of compared French towns is 44. 40% are 65 or older (France median 22%), 19% 80 or older. Ages ↓
Fewer residents than in 2012
Mailly-le-Château had 577 residents at the 2012 census and 514 in 2023, down 11%: slower growth than in 98% of compared French towns. Population ↓
Empty homes
The census found 87 homes empty (19%): for sale, to let, awaiting work or simply unused. Homes & cars ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
More second homes than 95% of compared French towns: 29%
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
A fifth of households have been in place 30 years or more; 6.4% moved in within the last two years. Higher than in 99% of compared French towns: 19% of homes stand empty. To put it in context, 2.1% of homes are second homes in the typical compared French town. The figure for households without a car is 15% in Mailly-le-Château and 11% in the typical compared French town.
Mailly-le-Château changed by −11% from 2012 to 2023, slower than 98% 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 years 2012 to 2017 brought −4%; 2017 to 2023, −7%.
Mailly-le-Château sits above 98% of compared French towns for residents aged 65 and over (40%)
Shares of residents by age at the 2023 census.
Age groups · share of residents
Median age of the 3,798 compared French towns
■ Mailly-le-Château 60.4. The median compared French town: 44.
5.4% of residents are 15 to 24; in the typical compared French town the figure is 11%. Elsewhere, 22% of residents are 65 or over in the typical compared French town.
Women and men · all residents
54% women, 46% men
About 84 men for every 100 women. Median share of women: Yonne 52.2%, France 51.8%. Women live longer than men, so towns with many older residents have more women.
Mailly-le-Château sits below 85% of compared French towns for couples with children (17%)
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
Each household has 1.9 people on average. One-person households are more common here than in 71% of compared French towns. On average, 25% of households are couples with children in the typical compared French town.
The middle resident’s standard of living: €23,860 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 €23,860 a year per consumption unit and half below; the level is lower than in 73% of compared French towns.
34% of households are headed by a retired person, a share 59% of compared French towns don’t reach
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
Across Mailly-le-Château, 15% of households are headed by a manual worker. 13% of the town’s households are headed by a manager or professional, against 9.4% in the median compared French town; 34% by a retired person (32%).
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
More foreign nationals than 64% of compared French towns: 6%
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.
Here 7.6% of residents are immigrants, where the figure in the typical compared French town is 6.5%. Against that, 4.3% of residents are foreign nationals in the typical compared French town. That is higher than in 58% of compared French towns; the median compared commune in Yonne has 9.2%.
INSEE publishes no country of birth or ethnicity by commune in these tables, and the census doesn’t ask about religion.
A smaller share of single residents than 87% of compared French towns: 21%
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
Married residents: 37%, below 85% of compared French towns. Single residents make up 25% in the typical compared French town.
30% of adults out of school have no qualification, more than in 91% 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
The figure for graduates of higher education is 22% in Mailly-le-Château and 30% in the typical compared French town. The share of adults with no qualification in the typical compared French town is 19%.
4th highest median age among 41 French towns of 514 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.
At the ends of the range sit Villejust (37.2), the youngest, and Prayssac (62.3), the oldest.
Mailly-le-Château is older than every town around it
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Mailly-le-Château | 60.4 | 40% | 29% | 7.6% |
| Clamecy 3,544 · 11 mi | 49.8 | 31% | 6.8% | 11% |
| Auxerre 35,097 · 14.3 mi | 44.1 | 24% | 3.1% | 13% |
| Avallon 6,305 · 14.8 mi | 50.5 | 30% | 5.6% | 12% |
| Saint-Georges-sur-Baulche 3,151 · 15.1 mi | 56.9 | 38% | 1.5% | 6.3% |
| Monéteau 4,114 · 17.7 mi | 52.1 | 32% | 2% | 6.2% |
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 Mailly-le-Château
What is the population of Mailly-le-Château?
514 at INSEE’s 2023 census, 11% fewer than in 2012 (577).
How old are Mailly-le-Château’s residents?
The median age is 60.4, older than 98% of compared French towns. 13% are under 18 and 40% 65 or older.
How many second homes are there in Mailly-le-Château?
130, with occasional dwellings: 29% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Mailly-le-Château?
INSEE counts 39 immigrants (born abroad, not French at birth), 7.6% of residents, and 31 foreign nationals (6%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Mailly-le-Château?
€23,860 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.