Households headed by a manager or professional make up 2.8% in Troissy, less than in 98% of compared French towns
Households in social housing are rarer here than in 99% of compared French towns. At the 2023 Census Troissy was home to 821 people in 370 households. In Troissy, 4.7% of homes are flats. The share of one-person households is 31%, against 35% in the typical compared French town.
Throughout this page, the Marne 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 Troissy
Empty homes
The census found 68 homes empty (14%): for sale, to let, awaiting work or simply unused. Homes & cars ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
Troissy changed by −4% from 2012 to 2023, slower than 84% 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
Over those years, the median Marne town changed −2% and the median compared French town +5%. Between 2012 and 2017 the population moved −3%, then −1% to 2023.
A median age of 45.8: Troissy is older than 62% 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
■ Troissy 45.8. The median compared French town: 44.
Where 22% of residents are 65 or over in the typical compared French town, Troissy has 21%. At 11%, the share of residents aged 15 to 24 is lower than in 51% of compared French towns.
Women and men · all residents
49% women, 51% men
About an even split. Median share of women: Marne 52.7%, France 51.8%.
Fewer single-parent households than 90% of compared French towns: 6.9%
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 Marne median and the France median
Living alone · share
Each household has 2.2 people on average. The share of single-parent households in the typical compared French town is 10%. Troissy has more couples with children than 62% of compared French towns, at 27%.
More empty homes than 94% of compared French towns: 14%
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
5.3% of households moved in less than two years ago; 29% have been in their home 30 years or more. Set beside that, 6.7% of homes stand empty in the typical compared French town. More second homes than in 85% of compared French towns: 7.8%. Households without a car: 6.8% here and 11% in the typical compared French town.
A median of €25,750 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.
Half of residents live in households above €25,750 a year per consumption unit and half below; the level is lower than in 52% of compared French towns.
Households headed by a manual worker: 29%, a higher share than 99% 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
About one in three: that is how common households headed by a retired person are in Troissy (32%). Measured more widely, 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).
Immigrants make up 3.4% in Troissy, less than in 79% of compared French towns
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.
Here 3.2% of residents are foreign nationals, where the figure in the typical compared French town is 4.3%. For 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.
24% of residents 15 and over are single, fewer than in 63% 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
The census found that 44% of residents 15 and over are married in Troissy. The benchmark for single residents in the typical compared French town: 25%.
In Troissy, 18% of adults out of school hold a higher-education qualification, fewer than in 90% 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
By its share of adults with no qualification (25%), Troissy is above just over three quarters of compared French towns. The comparison figure for graduates of higher education is 30% in the typical compared French town.
41 French towns of 821 to 2,582 people: this is the 20th oldest
The 40 compared French towns nearest in population, by median age. Hover for each one’s second homes and immigrants; click for its page.
Villejust is the youngest (37.2); Prayssac the oldest (62.3).
Troissy is younger than 3 of its 6 nearest neighbors
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Troissy | 45.8 | 21% | 7.8% | 3.4% |
| Dormans 2,890 · 2.9 mi | 48.9 | 28% | 3.7% | 4.9% |
| Épernay 22,174 · 11.8 mi | 44 | 23% | 5.2% | 11% |
| Fère-en-Tardenois 2,836 · 12 mi | 47.8 | 28% | 1.9% | 3.3% |
| Château-Thierry 15,097 · 14.3 mi | 41.3 | 22% | 2.4% | 16% |
| Aÿ-Champagne 5,103 · 14.4 mi | 51.9 | 30% | 3.2% | 2.5% |
| Fismes 5,850 · 15.8 mi | 43.6 | 23% | 1.5% | 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 Troissy
What is the population of Troissy?
821 at INSEE’s 2023 census, 4% fewer than in 2012 (854).
How old are Troissy’s residents?
The median age is 45.8, older than 62% of compared French towns. 19% are under 18 and 21% 65 or older.
How many second homes are there in Troissy?
37, with occasional dwellings: 7.8% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Troissy?
INSEE counts 28 immigrants (born abroad, not French at birth), 3.4% of residents, and 27 foreign nationals (3.2%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Troissy?
€25,750 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 October 30, 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.