A smaller share of flats than 99% of compared French towns: 0.4%
3.3% of households rent social housing (HLM) (typical compared French town: 12%). Fewer single-parent households than in 95% of compared French towns: 6.1%. Treffrin is home to 516 residents in 250 households, by the 2023 Census. Households headed by a manual worker come to 18% locally, about two in ten.
Throughout this page, the Côtes-d'Armor 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 Treffrin
Fewer residents than in 2012
Treffrin had 580 residents at the 2012 census and 516 in 2023, down 11%: slower growth than in 98% of compared French towns. Population ↓
An older town
Half of Treffrin’s residents are under 52.3 and half over; the median of compared French towns is 44. 33% are 65 or older (France median 22%), 6.8% 80 or older. Ages ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
Treffrin’s population moved −11% on 2012, less than in 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 median Côtes-d'Armor town changed +3% and the median compared French town +5%; here the first five years brought −6% and the next six −6%.
Half of Treffrin is over 52.3, older than 90% 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
■ Treffrin 52.3. The median compared French town: 44.
Here 7.4% of residents are 15 to 24, where the figure in the typical compared French town is 11%. Census figures put residents aged 65 and over at 33% in Treffrin.
Women and men · all residents
50% women, 50% men
About an even split. Median share of women: Côtes-d'Armor 52.9%, France 51.8%.
22% of households are couples with children, below 63% 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 Côtes-d'Armor median and the France median
Living alone · share
In the typical compared French town, the share of one-person households is 35%; Treffrin has 37%. The average household has 2.1 people. Couples with children make up 25% in the typical compared French town.
Treffrin ranks below 98% of compared French towns on households without a car: 3.3%
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
In Treffrin, nearly one in ten homes stand empty, beside 6.7% in the typical compared French town. Recent arrivals (under two years) make up nearly one in ten households; long-stayers (30 years or more) 37%. More second homes than in 52% of compared French towns: 2.2%. For comparison, 11% of households have no car in the typical compared French town.
At the median, €25,620 a year to live on
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.
Per consumption unit, half of residents live on more than €25,620 a year: lower than in 53% of compared French towns.
Households headed by a retired person: 37%, a higher share than 72% 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
Households headed by a manager or professional: 8.2% here and 9.4% in the typical compared French town. Against that, nearly a third of households are headed by a retired person in the typical compared French town.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
Only 3.5% of residents are immigrants in Treffrin
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.
Immigrants make up a share lower than in 78% of compared French towns; the median compared commune in Côtes-d'Armor has 2.7%. For immigrants, the comparison in the typical compared French town is 6.5%. Foreign nationals account for 3.3%.
INSEE publishes no country of birth or ethnicity by commune in these tables, and the census doesn’t ask about religion.
19% of residents 15 and over are single, below 97% of compared French towns
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
The figure for married residents is 52% in Treffrin and 43% in the typical compared French town. In the typical compared French town, the share of single residents is 25%.
Treffrin sits below 64% of compared French towns for graduates of higher education (26%)
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: 17% here and 19% in the typical compared French town. Measured more widely, 30% of adults out of school hold a higher-education qualification in the typical compared French town.
The 8th oldest of 41 French towns of 516 to 2,582 people
The 40 compared French towns nearest in population, by median age. Hover for each one’s second homes and immigrants; click for its page.
Ages run from 37.2 in Villejust to 62.3 in Prayssac.
A younger town than 3 of the 5 around it: Treffrin
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Treffrin | 52.3 | 33% | 2.2% | 3.5% |
| Carhaix-Plouguer 7,412 · 2.5 mi | 52.2 | 32% | 3.9% | 6% |
| Rostrenen 3,282 · 10.6 mi | 54.6 | 34% | 8.3% | 6.8% |
| Gourin 3,960 · 11.4 mi | 55.3 | 33% | 7.6% | 4.3% |
| Châteauneuf-du-Faou 3,651 · 15.6 mi | 51.2 | 30% | 15% | 7.4% |
| Le Faouët 2,814 · 18 mi | 56.1 | 37% | 8.2% | 3.8% |
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 Treffrin
What is the population of Treffrin?
516 at INSEE’s 2023 census, 11% fewer than in 2012 (580).
How old are Treffrin’s residents?
The median age is 52.3, older than 90% of compared French towns. 18% are under 18 and 33% 65 or older.
How many second homes are there in Treffrin?
6, with occasional dwellings: 2.2% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Treffrin?
INSEE counts 18 immigrants (born abroad, not French at birth), 3.5% of residents, and 17 foreign nationals (3.3%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Treffrin?
€25,620 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 4, 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.