0.5% of homes are flats, below 99% of compared French towns
Here 5.1% of households rent social housing (HLM), where the figure in the typical compared French town is 12%. Census figures put one-person households at 25% in Fonsomme. Nearly a quarter of households are headed by a manual worker, a higher share than in 92% of compared French towns. The town is home to 518 residents in 200 households, by the 2023 Census.
Throughout this page, the Aisne 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 Fonsomme
A young town
Half of Fonsomme’s residents are under 38.6 and half over; the median of compared French towns is 44. 20% are under 15 and 17% are 65 or older. Ages ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
Fonsomme’s population moved −2% on 2012, less than in 79% 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
Medians for comparison: +5% across compared French towns, −4% in Aisne. Here the change came as −12% to 2017, then +10% to 2023.
A median age of 38.6: Fonsomme is younger than 86% 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
■ Fonsomme 38.6. The median compared French town: 44.
With residents aged 15 to 24 at 10%, Fonsomme is behind nearly three fifths of compared French towns on that count. For Fonsomme, the census puts residents aged 65 and over at 17%.
Women and men · all residents
51% women, 49% men
About an even split. Median share of women: Aisne 52.5%, France 51.8%.
Above 80% of compared French towns: 31% of households are couples with children
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 Aisne median and the France median
Living alone · share
A household here holds 2.5 people on average. Set beside that, 25% of households are couples with children in the typical compared French town. Fonsomme has more single-parent households than 85% of compared French towns, at 13%.
Only 0.9% of homes are second homes in Fonsomme
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
Car-free households: one in 11, where the median compared French town has 11%. As a yardstick, 2.1% of homes are second homes in the typical compared French town. Recent arrivals (under two years) make up 4.1% of households; long-stayers (30 years or more) 33%. At 9.1%, the share of households without a car is lower than in 59% of compared French towns.
Half of residents have a standard of living above €21,530 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.
Half of Fonsomme’s residents live in households with a standard of living below €21,530 a year per consumption unit, and half above: lower than in 91% of compared French towns.
In Fonsomme, 5.2% of households are headed by a manager or professional, fewer than in 84% 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
Fonsomme has more households headed by a retired person than 54% of compared French towns, at 33%. In the typical compared French town, the share of households headed by a manager or professional is 9.4%.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
Fewer immigrants than 99% of compared French towns: 0.8%
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.
0.2% of residents are foreign nationals (typical compared French town: 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.
In Fonsomme, 44% of residents 15 and over are married, more than in 54% 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
On the census count, 25% of residents 15 and over are single. The benchmark for married residents in the typical compared French town: 43%.
A higher share of adults with no qualification than 97% of compared French towns, at 34%
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
Where 30% of adults out of school hold a higher-education qualification in the typical compared French town, Fonsomme has 17%. The comparison figure for adults with no qualification is 19% in the typical compared French town.
Of 41 French towns its size (518 to 2,582 people), the 2nd 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.
Ages run from 37.2 in Villejust to 62.3 in Prayssac.
Every neighbor is older than Fonsomme
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Fonsomme | 38.6 | 17% | 0.9% | 0.8% |
| Fresnoy-le-Grand 2,890 · 3.3 mi | 44.1 | 23% | 1.2% | 2.7% |
| Saint-Quentin 52,813 · 6.1 mi | 41.3 | 23% | 1.6% | 9% |
| Bohain-en-Vermandois 5,605 · 6.3 mi | 41.1 | 21% | 0.8% | 4.9% |
| Gauchy 5,183 · 7.5 mi | 47.7 | 24% | 0.4% | 4% |
| Guise 4,490 · 10.2 mi | 47.9 | 27% | 1% | 1.8% |
| Caudry 13,833 · 15.3 mi | 42.8 | 21% | 1% | 2.4% |
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 Fonsomme
What is the population of Fonsomme?
518 at INSEE’s 2023 census, 2% fewer than in 2012 (530).
How old are Fonsomme’s residents?
The median age is 38.6, younger than 86% of compared French towns. 24% are under 18 and 17% 65 or older.
How many second homes are there in Fonsomme?
2, with occasional dwellings: 0.9% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Fonsomme?
INSEE counts 4 immigrants (born abroad, not French at birth), 0.8% of residents, and 1 foreign nationals (0.2%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Fonsomme?
€21,530 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.