Photo: European Coal and Steel Community · CC BY-SA 4.0Trith-Saint-Léger: 24% of households rent social housing (HLM), above 85% of compared French towns
The figure for single-parent households is 13% in Trith-Saint-Léger and 10% in the typical compared French town. Households without a car are more common here than in four fifths of compared French towns. In 2023, the Census found 6,019 residents locally, living in 2,660 households. Census figures put households headed by a manager or professional at 5.8% locally.
Throughout this page, the Nord 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 Trith-Saint-Léger
Fewer residents than in 2012
Trith-Saint-Léger had 6,393 residents at the 2012 census and 6,019 in 2023, down 6%: slower growth than in 90% of compared French towns. Population ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
Since 2012, Trith-Saint-Léger has changed by −6%, slower than 90% 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 Nord town changed ±0% and the median compared French town +5%; here the first five years brought −3% and the next six −3%.
Half of Trith-Saint-Léger is under 40.6, younger than 76% 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
■ Trith-Saint-Léger 40.6. The median compared French town: 44.
Set against 22% in the typical compared French town, a fifth of residents are 65 or over in Trith-Saint-Léger. About one in eight: that is how common residents aged 15 to 24 are in Trith-Saint-Léger (13%).
Women and men · all residents
52% women, 48% men
About 93 men for every 100 women. Median share of women: Nord 51.9%, France 51.8%.
Trith-Saint-Léger ranks above 58% of compared French towns on one-person households: 37%
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 Nord median and the France median
Living alone · share
Households average 2.2 people. Typically, 35% of households are one person living alone in the typical compared French town. Nearly a quarter of households are couples with children, against 25% in the typical compared French town.
More empty homes than 71% of compared French towns: 8.8%
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
Flats: 22%, below 64% of compared French towns. Across Trith-Saint-Léger, 1.2% of homes are second homes. Empty homes make up 6.7% in the typical compared French town.
The median resident lives on €22,480 a year per consumption unit
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.
At €22,480 a year per consumption unit, the median standard of living here is lower than in 86% of compared French towns. 20.0% of residents live below the poverty line INSEE uses.
A higher share of households headed by a manual worker than 83% of compared French towns, at 20%
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
Set against 32% in the typical compared French town, 29% of households are headed by a retired person in Trith-Saint-Léger. For comparison, 14% of households are headed by a manual worker in the typical compared French town.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
Below 68% of compared French towns: 4.5% of 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.
In the typical compared French town, the share of foreign nationals is 4.3%; Trith-Saint-Léger has 3%. Measured more widely, 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.
Married residents: 36%, a lower share than 86% 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
With single residents at 30%, Trith-Saint-Léger is ahead of 78% of compared French towns on that count. Measured more widely, 43% of residents 15 and over are married in the typical compared French town.
Trith-Saint-Léger ranks below 84% of compared French towns on graduates of higher education: 20%
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: 25% here and 19% in the typical compared French town. Set beside that, 30% of adults out of school hold a higher-education qualification in the typical compared French town.
Among 41 French towns of 5,955 to 6,083 people, the 13th youngest
The 40 compared French towns nearest in population, by median age. Hover for each one’s second homes and immigrants; click for its page.
La Verrière is the youngest (35.4); Vaison-la-Romaine the oldest (56.6).
2 in 6 nearby towns have a higher median age than Trith-Saint-Léger
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Trith-Saint-Léger | 40.6 | 20% | 1.2% | 4.5% |
| La Sentinelle 3,103 · 1.4 mi | 42.1 | 20% | 1.9% | 5.6% |
| Aulnoy-lez-Valenciennes 7,080 · 1.5 mi | 35.9 | 19% | 0.8% | 7.9% |
| Maing 3,954 · 1.5 mi | 43.8 | 23% | 0.8% | 2.7% |
| Valenciennes 43,468 · 2 mi | 36.4 | 17% | 3% | 11% |
| Hérin 4,169 · 2.3 mi | 38.7 | 16% | 0.2% | 2.8% |
| Thiant 2,914 · 2.5 mi | 39.6 | 17% | 1.8% | 1.7% |
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 Trith-Saint-Léger
What is the population of Trith-Saint-Léger?
6,019 at INSEE’s 2023 census, 6% fewer than in 2012 (6,393).
How old are Trith-Saint-Léger’s residents?
The median age is 40.6, younger than 76% of compared French towns. 21% are under 18 and 20% 65 or older.
How many second homes are there in Trith-Saint-Léger?
36, with occasional dwellings: 1.2% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Trith-Saint-Léger?
INSEE counts 270 immigrants (born abroad, not French at birth), 4.5% of residents, and 180 foreign nationals (3%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Trith-Saint-Léger?
€22,480 a year per consumption unit in 2023 (median of compared French towns €25,970); 20.0% of residents live below the poverty line. 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 9, 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.