Half of Treffiagat is over 57.9, older than 97% of compared French towns
With households headed by a retired person at 54%, Treffiagat is ahead of 99% of compared French towns on that count. For Treffiagat, the census puts empty homes at 2%. Fewer single-parent households than in 98% of compared French towns: 5.4%. There were 1,220 households locally at the 2023 Census, home to 2,429 residents.
Throughout this page, the Finistère 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 Treffiagat
One home in three is a second home
The census counted 630 second homes and occasional dwellings in Treffiagat, 33% of its 1,880 homes: higher than in 95% of compared French towns. 98% 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 Treffiagat’s residents are under 57.9 and half over; the median of compared French towns is 44. 37% are 65 or older (France median 22%), 9.2% 80 or older. Ages ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
More second homes than 95% of compared French towns: 33%
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
4.6% of households rent social housing (HLM); in the typical compared French town the figure is 12%. Add to that, at 2.1%, the share of flats is lower than in 99% of compared French towns. On the census count, 6.7% of households have no car.
Since 2012, Treffiagat has changed by +1%, slower than 66% 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
For comparison, the median compared French town changed +5% and the median Finistère town +4%. The first five years brought ±0%; the six to 2023, +1%.
More residents aged 65 and over than 96% of compared French towns: 37%
Shares of residents by age at the 2023 census.
Age groups · share of residents
Median age of the 3,798 compared French towns
■ Treffiagat 57.9. The median compared French town: 44.
In the typical compared French town, just over one in ten residents are 15 to 24; in Treffiagat, 7.5%. Across the comparison, 22% of residents are 65 or over in the typical compared French town.
Women and men · all residents
51% women, 49% men
About an even split. Median share of women: Finistère 51.7%, France 51.8%.
19% of households are couples with children, below 77% 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 Finistère median and the France median
Living alone · share
Households here average 2 people each. Couples with children: 25% in the typical compared French town, for comparison. In Treffiagat, 36% of households are one person living alone, beside 35% in the typical compared French town.
Half of residents have a standard of living above €27,280 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 €27,280 a year per consumption unit, higher than in 64% of compared French towns. Poverty touches 8.0% of residents.
Households headed by a manager or professional: 5.3%, a lower share than 82% 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
The census found that 14% of households are headed by a manual worker in Treffiagat. By way of comparison, 9.4% of households are headed by a manager or professional in the typical compared French town.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
Only 1.8% of residents are immigrants in Treffiagat
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, 4.3% of residents are foreign nationals; in Treffiagat, 0.9%. Elsewhere, 6.5% of residents are immigrants in the typical compared French town. The median compared commune in Finistère has 2.4%; immigrants here make up a share lower than in 94% 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.
A smaller share of single residents than 98% of compared French towns: 18%
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
53% of residents 15 and over are married; in the typical compared French town the figure is 43%. The share of single residents in the typical compared French town is 25%.
Only 16% of adults out of school have no qualification in Treffiagat
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
With graduates of higher education at 27%, Treffiagat is behind 61% of compared French towns on that count. In the typical compared French town, 19% of adults out of school have no qualification.
41 French towns of 2,429 to 2,582 people: this is the 5th 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.
3 in 6 nearby towns have a higher median age than Treffiagat
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Treffiagat | 57.9 | 37% | 33% | 1.8% |
| Guilvinec 2,669 · 0.9 mi | 60.7 | 42% | 39% | 1.7% |
| Plobannalec-Lesconil 3,718 · 2 mi | 54.1 | 31% | 33% | 2% |
| Plomeur 3,904 · 2.2 mi | 49.8 | 27% | 14% | 1.7% |
| Penmarch 5,508 · 4 mi | 60.8 | 41% | 40% | 2.9% |
| Loctudy 4,075 · 4.2 mi | 63.6 | 46% | 49% | 1.6% |
| Pont-l'Abbé 8,484 · 4.7 mi | 53.8 | 33% | 9.9% | 2.9% |
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 Treffiagat
What is the population of Treffiagat?
2,429 at INSEE’s 2023 census, about the same as in 2012 (2,408).
How old are Treffiagat’s residents?
The median age is 57.9, older than 97% of compared French towns. 15% are under 18 and 37% 65 or older.
How many second homes are there in Treffiagat?
630, with occasional dwellings: 33% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Treffiagat?
INSEE counts 44 immigrants (born abroad, not French at birth), 1.8% of residents, and 22 foreign nationals (0.9%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Treffiagat?
€27,280 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 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.