Triel-sur-Seine’s grades pull in different directions. Homes are dear: at the median price, a 70 m² home costs 8.8 times the median annual income per consumption unit in the intercommunality. The town ranks #63 of 91 in Yvelines, with a C+ overall. Set against the rest, it does better than 36% of compared French towns. People here tend to be in good health: after allowing for care homes, deaths from 2016 to 2025 were 34% below expected, against 12% below for the median of compared French towns. It is strong on walkability as well — 88% of residents live within 800 m of a bakery, and 32% of working residents walk, cycle or take public transport to work. Schools lag: bac results 2.5 points below the expected rate; brevet results 8.6 points below the expected rate.
Figures: deaths, INSEE (by commune of residence, 2016–2025) · amenities, INSEE BPE 2025 · commuting, INSEE census 2023 · prices, DVF · income per consumption unit (an income adjusted for household size), INSEE Filosofi · brevet and bac results, Ministry of Education.
Hazard risk isn’t graded in France yet: national flood maps cover only some areas. The overall grade uses the other six subjects.
Each subject compares Triel-sur-Seine with other French towns of 2,500 or more, ordered by how far its rank is from the middle. American and UK towns are graded separately.
Data highlights are ordered by what stands out in Triel-sur-Seine.
HealthHealth A
Allowing for age and care homes, Triel-sur-Seine sees fewer deaths than Yvelines’ towns or compared French towns: 66 per 100 expected
Care access and life expectancy are shown for context, not graded.
6 GPs practise in Triel-sur-Seine. Average lifespans in Yvelines: 86.8 years for women, 82.3 for men (2025), against 85.9 and 80.3 nationally. 658 deaths locally between 2016 and 2025, where France’s rates at each age predict 916: 28% below.
−34%deaths against expected, after care homesAHealth Grade
Deaths per 100 expected · 2016–2025
Raw72
Adjusted66
Median town88
Expected100
6
GPs in Triel-sur-Seine · 2.8 GP consultations a year per resident within reach (APL)
4.3 mi
to the nearest emergency department, Ctre hospitalier Intercommunal Poissy St Germain site Poissy
4.3 mi
to the nearest maternity unit, Ctre hospitalier Intercommunal Poissy St Germain site Poissy
86.8 · 82.3
years of life expectancy at birth, women · men, Yvelines, 2025 (provisional) · France 85.9 · 80.3
The median home in Triel-sur-Seine sells for €3,377/m², against €3,717/m² in Yvelines’ towns and €2,430/m² in compared French towns
Rents are the ministry’s estimates of advertised rents, not rents actually paid.
A house in Triel-sur-Seine goes for €3,490/m², an apartment for €3,203/m². The estimated advertised rent is €17.58/m² a month, about level with Yvelines’ towns (€18.40/m²) and above compared French towns (€12.41/m²). This Yvelines town recorded 428 home sales from July 2023 to June 2026.
€3,377/m²median sale price
Median sale price per m² · Jul 2023 to Jun 2026
Triel-sur-Seine€3,377/m²
Median of towns€2,430/m²
Yvelines median€3,717/m²
By type
Median per m²
Sales
Houses
€3,490/m²
280
Apartments
€3,203/m²
148
€17.58/m²
estimated advertised apartment rent a month, charges included (€14.80 to €20.88/m² a month)
8.8
times the median annual income per consumption unit in the intercommunality, for 70 m² at the median price
€14.73/m²
estimated advertised house rent a month, charges included
€26,750
median annual income per consumption unit, Communauté urbaine Grand Paris Seine et Oise
Source: DGFiP, DVF property sales (Etalab geolocated); Housing Ministry, Carte des loyers 2025; INSEE, Filosofi 2023 · Licence Ouverte
Work & commuteJobs & income B
A walkable place: Triel-sur-Seine beats 91% of compared French towns on foot
The typical income here, after tax and benefits, is €32,940 a year per consumption unit. 31.7% of commuters walked, cycled or took the bus or train at the census, below Yvelines’ towns (35.4%) but above compared French towns (13.4%). 1,650 jobs are based in Triel-sur-Seine, for 5,850 working residents (0.3 per worker). The unemployment rate comes to 8.0%.
32%walk, cycle or take transit
How working residents got to work · census 2023
Driving63%
Public transport28%
On foot3%
Motorbike or scooter2%
Bicycle1%
1,650
jobs based in Triel-sur-Seine, 0.3 per working resident
8.0%
unemployment rate, ages 15 to 64 in the labor force · median of compared French towns 10.1%
€32,940
median annual income per consumption unit, 2023 · median of compared French towns €25,970
4%
worked without traveling (at or from home)
A
Walkability: better than 91% of compared French towns
Source: INSEE, census 2023 (commuting, employment, jobs at place of work); INSEE, Filosofi 2023 · Licence Ouverte
Schools
Fewer pupils pass the brevet at the collèges near Triel-sur-Seine than in Yvelines’ towns or compared French towns: 79.4%
Primary schools aren’t graded: France doesn’t publish their results by school.
90.3% of candidates passed the bac at the lycées within 5 km of Triel-sur-Seine, below Yvelines’ towns (93.9%) and compared French towns (92.9%) alike. Vocational results within 5 km: 78% passed the bac pro, of 202 candidates at 2 lycées. Ranked by results, schools here are #73 of 94 in Yvelines.
94%passed the bac (general and technological)DSchool Grade
Ministry of Education (DEPP) · brevet and bac 2025, value added (IVAC, IVAL) · Licence Ouverte
Who lives here
Triel-sur-Seine skews young, with 12% of residents aged 15 to 24, more than in both Yvelines’ towns and compared French towns
Graduates make up 49% of adults. Children under 15 make up 20%, about level with Yvelines’ towns (20%) and above compared French towns (17%). 16% of residents are 65 or over.
39.7median age
Triel-sur-SeineYvelines medianFrance median
Ages · share of residents
12%
Under 1515–2425–4445–6465+
Highest diploma · residents 15 and older who have left education
No diploma13%
CAP or BEP18%
Baccalauréat16%
Higher education49%
Women and men · all residents
50% women, 50% men
WomenFrance medianMen
About an even split. Median share of women: Yvelines 51.6%, France 51.8%.
INSEE, census 2023 · Yvelines median and France median: the median of compared communes
Safety
More crime per resident in Triel-sur-Seine than in 62% of compared French towns
Among the graded crimes in Triel-sur-Seine, the most frequent was criminal damage (2025). For 2025, the figures show 282 offenses here. Graded property crimes ran at 17 per 1,000 residents a year, and violence against people at 7 (2023–2025 average).
7recorded violent incidents per 1,000 residents a yearC+Safety Grade
Recorded by type · 2025
Criminal damage69
Burglary66
Family violence52
Vehicle theft40
Other physical violence19
Sexual violence18
Theft from vehicles18
Fraud91
Theft without violence57
Drug use27
Not in the gradeTheft without violence, drug use and fraud are shown for information but left out of the Safety Grade, which counts violence plus burglaries, vehicle thefts, thefts from vehicles and criminal damage per resident.
7
recorded violent incidents per 1,000 residents a year, 2023–2025 average
17
recorded burglaries, vehicle thefts, thefts from vehicles and acts of criminal damage per 1,000 residents a year, 2023–2025 average
282
offenses recorded in the graded categories in 2025
0.4%
of the index rests on the département’s average, used where small counts aren’t published
Source: SSMSI (Interior Ministry), recorded crime by commune, 2023–2025 · Licence Ouverte · For armed robbery, the count isn’t published when it’s small (five or fewer in a year of the last three), so the index uses the département’s average, 0.4% of the index here. The count covers the offense categories the Safety Grade uses.
History
Triel-sur-Seine: 2 historic monuments, 1 classé
France has no History Grade yet: this card describes, it doesn’t grade.
Among the classé monuments in Triel-sur-Seine is Église Saint-Martin. Its oldest listed monument dates from the 12th century. The pre-1919 share of homes is 8.7%.
People: INSEE, census 2023. Miles: center to center.
Questions about Triel-sur-Seine
Is Triel-sur-Seine safe?
It grades C+ for safety, #75 of 91 in Yvelines. In 2025 police and gendarmerie recorded 66 burglaries and 69 acts of criminal damage.
Are schools in Triel-sur-Seine good?
They grade D, better than 9% of compared French towns and #73 of 94 in Yvelines. The lycée stands out: 100% of 324 candidates passed the bac at Lycée Notre-Dame Les Oiseaux in 2025, a point above the expected rate given its pupils’ backgrounds. Primary schools aren’t graded: France doesn’t publish their results by school.
Is Triel-sur-Seine expensive to live in?
Incomes are higher than in most compared French towns, so Triel-sur-Seine grades D for cost of living.
About Triel-sur-Seine
Commune in Yvelines, Île-de-France
Triel-sur-Seine is a commune of 12,206 people in the Communauté urbaine Grand Paris Seine et Oise. 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.
