Couples with children make up 39% in Senlis-le-Sec, more than in 98% of compared French towns
In Senlis-le-Sec, 1.5% of homes are flats, beside 30% in the typical compared French town. 4.1% of households are headed by a manager or professional. Second homes are rarer here than in 99% of compared French towns. This Somme town counted 324 residents and 120 households at the 2023 Census.
Throughout this page, the Somme 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 Senlis-le-Sec
A town of families
39% of households are couples with children and 4.3% single parents with children; 24% of residents are under 15. Households ↓
A young town
Half of Senlis-le-Sec’s residents are under 38.7 and half over; the median of compared French towns is 44. 24% are under 15 and 21% are 65 or older. Ages ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
Growth of +14% since 2012 puts Senlis-le-Sec ahead of 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
For comparison, the median compared French town changed +5% and the median Somme town −3%.
Half of Senlis-le-Sec is under 38.7, younger than 85% 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
■ Senlis-le-Sec 38.7. The median compared French town: 44.
The share of residents aged 65 and over trails three fifths of compared French towns: 21%. The census found that nearly one in ten residents are 15 to 24 in Senlis-le-Sec.
Women and men · all residents
52% women, 48% men
About 93 men for every 100 women. Median share of women: Somme 52.5%, France 51.8%.
Below 96% of compared French towns: 24% of households are one person living alone
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 Somme median and the France median
Living alone · share
The share of single-parent households is 4.3%, against 10% in the typical compared French town. The wider picture: just over a third of households are one person living alone in the typical compared French town. Average household size: 2.6 people.
Below 72% of compared French towns: 7.1% of households have no car
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
Households in social housing are rarer here than in 99% of compared French towns. Of all households, 11% moved in during the last two years and 36% have stayed three decades or more. Empty homes are about as common here as in the typical compared French town: 7.6%.
Standard of living at the median: €25,040 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 residents live in households above €25,040 a year per consumption unit and half below; the level is lower than in 60% of compared French towns.
In Senlis-le-Sec, 21% of households are headed by a manual worker, more than in 87% 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
The share of households headed by a retired person is 28%, against 32% in the typical compared French town. The usual figure: 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).
Senlis-le-Sec sits below 96% of compared French towns for immigrants (1.5%)
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 0.3% of residents are foreign nationals, where the figure in the typical compared French town is 4.3%. The wider picture: 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.
Only 22% of residents 15 and over are single in Senlis-le-Sec
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
Married residents make up 47%, against 43% in the typical compared French town. Typically, 25% of residents 15 and over are single in the typical compared French town.
In Senlis-le-Sec, 18% of adults out of school hold a higher-education qualification, fewer than in 92% 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
Nearly a fifth of adults out of school have no qualification. In the typical compared French town, graduates of higher education come to 30%.
Among 41 French towns of 324 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.
Senlis-le-Sec is younger than every town around it
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
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 Senlis-le-Sec
What is the population of Senlis-le-Sec?
324 at INSEE’s 2023 census, 14% more than in 2012 (285).
How old are Senlis-le-Sec’s residents?
The median age is 38.7, younger than 85% of compared French towns. 26% are under 18 and 21% 65 or older.
How many second homes are there in Senlis-le-Sec?
0, with occasional dwellings: 0% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Senlis-le-Sec?
INSEE counts 5 immigrants (born abroad, not French at birth), 1.5% of residents, and 1 foreign nationals (0.3%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Senlis-le-Sec?
€25,040 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 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.