Fewer households in social housing than 97% of compared French towns: 1.7%
Against a figure of 11% in the typical compared French town, the share of households without a car in Trie-Château comes in at 5.1%. About one in eight: that is how common flats are in Trie-Château (13%). With a median age of 47.5, Trie-Château is older than 72% of compared French towns. Census day 2023: 1,875 residents and 770 households here.
Throughout this page, the Oise 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.
From 2012 to 2023, 62% of compared French towns grew faster than Trie-Château: +2%
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, +5% to 2017 and −3% after, the town’s change compares with +5% for the median compared French town and +2% in Oise.
Trie-Château ranks below 76% of compared French towns on residents aged 15 to 24: 9.3%
Shares of residents by age at the 2023 census.
Age groups · share of residents
Median age of the 3,798 compared French towns
■ Trie-Château 47.5. The median compared French town: 44.
Nearly a quarter of residents are 65 or over. As a yardstick, 11% of residents are 15 to 24 in the typical compared French town.
Women and men · all residents
52% women, 48% men
About 91 men for every 100 women. Median share of women: Oise 51.7%, France 51.8%.
A lower share of one-person households than 88% of compared French towns, at 27%
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 Oise median and the France median
Living alone · share
Households average 2.4 people. At 7.8%, the share of single-parent households is lower than in 82% of compared French towns. The usual figure: just over a third of households are one person living alone in the typical compared French town. With couples with children at 28%, Trie-Château is ahead of 64% of compared French towns on that count.
3.5% of homes are second homes, a share 67% of compared French towns don’t reach
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
Without a car: one household in 20, against 11% in the median compared French town. Recent arrivals (under two years) make up 8.6% of households; long-stayers (30 years or more) 22%. 7% of homes stand empty, a higher share than in 53% of compared French towns. Typically, 2.1% of homes are second homes in the typical compared French town.
A median standard of living of €27,900 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 €27,900 a year per consumption unit, higher than in 70% of compared French towns.
A smaller share of households headed by a retired person than 71% of compared French towns: 29%
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
About one in eight: that is how common households headed by a manual worker are in Trie-Château (13%). Higher than in 52% of compared French towns: 9.7% of households are headed by a manager or professional.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
6% of Trie-Château’s residents are immigrants
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.
That is lower than in 54% of compared French towns; the median compared commune in Oise has 7.4%. Put another way, about one in 17: 6% of residents are immigrants. At 4.3%, foreign nationals sit close to the figure 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.
Fewer single residents than 81% of compared French towns: 22%
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 47% in Trie-Château and 43% in the typical compared French town. In the typical compared French town, single residents come to 25%.
24% of adults out of school hold a higher-education qualification, below 73% of compared French towns
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
In the typical compared French town, 19% of adults out of school have no qualification; in Trie-Château, 23%. Graduates of higher education make up 30% in the typical compared French town.
15th highest median age among 41 French towns of 1,875 to 2,582
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.
Nearby, 1 of 6 towns have older populations than Trie-Château
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Trie-Château | 47.5 | 23% | 3.5% | 6% |
| Gisors 12,410 · 2.2 mi | 43.3 | 22% | 2.3% | 9.2% |
| Chaumont-en-Vexin 3,338 · 3.4 mi | 44.2 | 25% | 3.4% | 7.5% |
| Sérifontaine 2,784 · 4.8 mi | 42.7 | 20% | 1.4% | 5% |
| Étrépagny 3,670 · 9.4 mi | 47.8 | 24% | 1.5% | 5.2% |
| Magny-en-Vexin 5,779 · 9.5 mi | 41.6 | 18% | 1.5% | 11% |
| Auneuil 2,898 · 9.6 mi | 43.3 | 20% | 2.2% | 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 Trie-Château
What is the population of Trie-Château?
1,875 at INSEE’s 2023 census, 2% more than in 2012 (1,842).
How old are Trie-Château’s residents?
The median age is 47.5, older than 72% of compared French towns. 20% are under 18 and 23% 65 or older.
How many second homes are there in Trie-Château?
30, with occasional dwellings: 3.5% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Trie-Château?
INSEE counts 110 immigrants (born abroad, not French at birth), 6% of residents, and 80 foreign nationals (4.3%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Trie-Château?
€27,900 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.