With fewer than 1,000 residents, Île-de-Sein falls below the line for grades. Second homes make up 48% of its housing. Over-65s are 44% of the population.
What makes Île-de-Sein stand out
The 2 things Île-de-Sein does most differently from other towns.
Data highlights are ordered by what stands out in Île-de-Sein.
Who lives here
Fewer children live in Île-de-Sein than in Finistère’s towns or compared French towns: 3.5% are under 15
Young adults of 15 to 24 account for 3.9% of the town. 44% of residents are 65 or over, above both Finistère’s towns (26%) and compared French towns (22%). Among adults, 21% have a degree.
62.3median age
Île-de-SeinFinistère medianFrance median
Ages · share of residents
44%
Under 1515–2425–4445–6465+
Highest diploma · residents 15 and older who have left education
No diploma18%
CAP or BEP30%
Baccalauréat22%
Higher education21%
Women and men · all residents
48% women, 52% men
WomenFrance medianMen
About 109 men for every 100 women. Median share of women: Finistère 51.7%, France 51.8%.
INSEE, census 2023 · Finistère median and France median: the median of compared communes
History
Old homes shape Île-de-Sein: 40% were built before 1919, more than in Finistère’s towns or compared French towns
France has no History Grade yet: this card describes, it doesn’t grade.
Its heritage reaches back to prehistory. Among the classé monuments in Île-de-Sein is Deux menhirs dits Les Causeurs. The Culture ministry lists 4 historic monuments here: 1 classé (France’s highest heritage protection) and 3 inscrit (the second level).
Ministère de la Culture, Mérimée (Licence Ouverte 2.0) · INSEE, census 2023, homes by build period
Work & commute
Île-de-Sein gets to work on foot, by bike and by public transport more than Finistère’s towns or compared French towns: 70.5% of commuters
Unemployment runs at 14.1%. Jobs located in Île-de-Sein: 100, for 100 residents in work (1 each). At the census, 11.1% of working residents in Île-de-Sein didn’t travel to work at all.
71%walk, cycle or take transit
How working residents got to work · census 2023
On foot66%
Driving18%
Bicycle3%
Public transport1%
Motorbike or scooter0%
100
jobs based in Île-de-Sein, 1 per working resident
14.1%
unemployment rate, ages 15 to 64 in the labor force · median of compared French towns 10.1%
People: INSEE, census 2023. Miles: center to center.
About Île-de-Sein
Commune in Finistère, Brittany
Île-de-Sein is a commune of 263 people. TownRatings compares communes, France’s local unit: each has its own mayor and its own statistics. Its area takes in the town and the countryside around it.
Built from INSEE’s 2026 official geography (COG) and IGN Admin Express boundaries
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.
