In Cast, 4.4% of homes are flats, fewer than in 96% of compared French towns
Households in social housing: 6%, below just over four fifths of compared French towns. There were 730 households in Cast at the 2023 Census, home to 1,570 residents. Here, 5.2% of households have no car. Half of the town’s residents are over 48, older than in 74% of compared French towns.
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.
Since 2012, Cast has changed by −2%, slower than 78% 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
In two steps, −3% to 2017 and +1% after, the town’s change compares with +5% for the median compared French town and +4% in Finistère.
A smaller share of residents aged 15 to 24 than 67% of compared French towns: 9.8%
Shares of residents by age at the 2023 census.
Age groups · share of residents
Median age of the 3,798 compared French towns
■ Cast 48. The median compared French town: 44.
Just over a fifth of residents are 65 or over, or about one in five. In the typical compared French town, 11% of residents are 15 to 24.
Women and men · all residents
51% women, 49% men
About an even split. Median share of women: Finistère 51.7%, France 51.8%.
Below 60% of compared French towns: 23% 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 Finistère median and the France median
Living alone · share
The average household has 2.1 people. The wider picture: 25% of households are couples with children in the typical compared French town. 37% of households are one person living alone, more than in 57% of compared French towns. On single-parent households, 10% here is much the same as in the typical compared French town.
9.4% of homes are second homes, more than in 87% 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
Set against 6.7% in the typical compared French town, 10% of homes stand empty in Cast. Long tenure is the mark of 25% of households (30 years or more), short tenure of 9.1% (under two years). Against that, 2.1% of homes are second homes in the typical compared French town.
The middle resident’s standard of living: €24,850 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.
Living standards centre on €24,850 a year per consumption unit: lower than in 62% of compared French towns.
6.1% of households are headed by a manager or professional, fewer than in 75% 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
Here 16% of households are headed by a manual worker, where the figure in the typical compared French town is 14%. Compared with other places, households headed by a retired person are common here: 34%, more than in 59% of compared French towns. The benchmark for households headed by a manager or professional in the typical compared French town: 9.4%.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
Cast ranks below 86% of compared French towns on immigrants: 2.5%
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 Cast, 1.2%. Across the comparison, 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.
Cast ranks below 63% of compared French towns on single residents: 24%
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: 44% of the total. Single residents make up 25% in the typical compared French town.
Fewer adults with no qualification than 95% of compared French towns: 10%
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 share of graduates of higher education stands at 29%. For adults with no qualification, the comparison in the typical compared French town is 19%.
Ranked by age, 15th oldest of 41 French towns this size
The 40 compared French towns nearest in population, by median age. Hover for each one’s second homes and immigrants; click for its page.
The youngest is Villejust (37.2), the oldest Prayssac (62.3).
Older than Cast: 1 of the 6 towns nearby
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Cast | 48 | 22% | 9.4% | 2.5% |
| Châteaulin 5,085 · 3.9 mi | 47.4 | 24% | 5.7% | 4.2% |
| Plogonnec 3,236 · 5.7 mi | 45.9 | 25% | 6.9% | 2% |
| Briec 5,816 · 7 mi | 42.6 | 19% | 3.9% | 6.3% |
| Pont-de-Buis-lès-Quimerch 3,663 · 7.8 mi | 43.3 | 19% | 7.4% | 2.9% |
| Pleyben 3,692 · 9.2 mi | 46.6 | 23% | 4.6% | 2.7% |
| Douarnenez 14,068 · 10 mi | 55.6 | 35% | 15% | 3.1% |
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 Cast
What is the population of Cast?
1,570 at INSEE’s 2023 census, 2% fewer than in 2012 (1,600).
How old are Cast’s residents?
The median age is 48, older than 74% of compared French towns. 21% are under 18 and 22% 65 or older.
How many second homes are there in Cast?
86, with occasional dwellings: 9.4% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Cast?
INSEE counts 40 immigrants (born abroad, not French at birth), 2.5% of residents, and 19 foreign nationals (1.2%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Cast?
€24,850 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.