2.9% of households have no car, fewer than in 99% of compared French towns
Residents aged 65 and over make up 16%, against 22% in the typical compared French town. Census day 2023: 2,572 residents and 1,050 households in Treffléan. On the census count, 3% of homes stand empty. At 28%, the share of one-person households is lower than in 86% of compared French towns.
Throughout this page, the Morbihan 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 Treffléan
Growing fast
Treffléan had 2,058 residents at the 2012 census and 2,572 in 2023, up 25%: faster growth than in 94% of compared French towns. Population ↓
A town of families
34% of households are couples with children and 5.2% single parents with children; 21% of residents are under 15. Households ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
+25% since 2012, a pace 94% of compared French towns didn’t match
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 +13%; 2017 to 2023, +11%. Over the whole period the median compared French town changed +5%, and the median Morbihan town +7%.
Younger than 77% of compared French towns: half of Treffléan is under 40.5
Shares of residents by age at the 2023 census.
Age groups · share of residents
Median age of the 3,798 compared French towns
■ Treffléan 40.5. The median compared French town: 44.
Where just over one in ten residents are 15 to 24 in the typical compared French town, Treffléan has 8.6%.
Women and men · all residents
51% women, 49% men
About an even split. Median share of women: Morbihan 51.6%, France 51.8%.
Above 91% of compared French towns: 34% of households are couples with children
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 Morbihan median and the France median
Living alone · share
A household here holds 2.4 people on average. 5.2% of households are single parents, a lower share than in 98% of compared French towns. The benchmark for couples with children in the typical compared French town: 25%.
Below 93% of compared French towns: 3.2% of households rent social housing (HLM)
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
Flats: 8.7%, below 89% of compared French towns. 2.2% of homes are second homes, a higher share than in 51% of compared French towns. Against that, just over one in ten households rent social housing (HLM) in the typical compared French town.
Half above, half below €27,180 a year in standard of living
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 median standard of living in Treffléan is €27,180 a year per consumption unit: higher than in 63% of compared French towns. Under the poverty line sit 8.0% of residents.
A larger share of households headed by a manual worker than 75% of compared French towns: 18%
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
Compared with 32% in the typical compared French town, 30% of households are headed by a retired person here. Households headed by a manager or professional account for 11%. The share of households headed by a manual worker in the typical compared French town is 14%.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
Fewer immigrants than 90% of compared French towns: 2.1%
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.
In the typical compared French town, the share of foreign nationals is 4.3%; Treffléan has 1.6%. Immigrants: 6.5% in the typical compared French town, for comparison. The median compared commune in Morbihan has 2.3%; immigrants here make up a share lower than in 90% of compared French towns.
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 89% of compared French towns: 20%
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 people make up 47% and PACS partners 13%, against 43% and 6.1% in the median compared French town; 4.9% are widowed. Across the comparison, a quarter of residents 15 and over are single in the typical compared French town.
11% of adults out of school have no qualification, below 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
Just over a third of adults out of school hold a higher-education qualification, against 30% in the typical compared French town. Adults with no qualification: 19% in the typical compared French town, for comparison.
6th lowest median age among 41 French towns of 2,544 to 2,601
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 Eymet (61.2), the oldest.
Every neighbor is older than Treffléan
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Treffléan | 40.5 | 16% | 2.2% | 2.1% |
| Saint-Nolff 3,990 · 2.1 mi | 46.8 | 23% | 1.6% | 2.9% |
| Sulniac 3,852 · 2.5 mi | 41.6 | 17% | 8% | 2% |
| Theix-Noyalo 8,500 · 3.9 mi | 48 | 24% | 3.5% | 2.3% |
| Elven 6,651 · 4 mi | 41.4 | 18% | 2.4% | 2.6% |
| Monterblanc 3,356 · 5.1 mi | 41.2 | 15% | 1.6% | 1.8% |
| Saint-Avé 12,470 · 5.6 mi | 44.9 | 23% | 1.5% | 4.2% |
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 Treffléan
What is the population of Treffléan?
2,572 at INSEE’s 2023 census, 25% more than in 2012 (2,058).
How old are Treffléan’s residents?
The median age is 40.5, younger than 77% of compared French towns. 25% are under 18 and 16% 65 or older.
How many second homes are there in Treffléan?
24, with occasional dwellings: 2.2% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Treffléan?
INSEE counts 55 immigrants (born abroad, not French at birth), 2.1% of residents, and 40 foreign nationals (1.6%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Treffléan?
€27,180 a year per consumption unit in 2023 (median of compared French towns €25,970); 8.0% of residents live below the poverty line. 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 October 30, 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.