Above 99% of compared French towns: 29% of households are headed by a manual worker
With couples with children at 32%, Caix is ahead of 84% of compared French towns on that count. In 2023, the Census found 704 residents locally, living in 290 households. For Caix, the census puts households without a car at 7%. Half of the town’s residents are under 41.9, younger than in 67% of compared French towns.
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 Caix
Fewer residents than in 2012
Caix had 744 residents at the 2012 census and 704 in 2023, down 5%: slower growth than in 89% of compared French towns. Population ↓
Empty homes
The census found 47 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.
A change of −5% since 2012 leaves Caix behind 89% 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
From 2012 to 2017 the change was −1%; from 2017 to 2023, −5%.
More residents aged 15 to 24 than 71% of compared French towns: 12%
Shares of residents by age at the 2023 census.
Age groups · share of residents
Median age of the 3,798 compared French towns
■ Caix 41.9. The median compared French town: 44.
For Caix, the census puts residents aged 65 and over at 23%. To put it in context, 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: Somme 52.5%, France 51.8%.
Caix ranks below 86% of compared French towns on one-person households: 28%
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
Where one in ten households are single parents in the typical compared French town, Caix has 8.3%. Against that, just over a third of households are one person living alone in the typical compared French town.
14% of homes stand empty, a share 93% 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
Households in social housing are rarer here than in 99% of compared French towns. In the typical compared French town, empty homes come to 6.7%. Census figures put second homes at 2.4% in Caix.
Half above, half below €24,460 a year in standard of living
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 median standard of living in Caix is €24,460 a year per consumption unit: lower than in 67% of compared French towns.
Caix sits below 87% of compared French towns for households headed by a retired person (24%)
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 manager or professional is 4.9%, against 9.4% in the typical compared French town. Set beside that, 32% of households are headed by a retired person in the typical compared French town.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
Caix ranks below 99% of compared French towns on immigrants: 1%
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.
Compared with 4.3% in the typical compared French town, 1% of residents are foreign nationals here. Immigrants: 6.5% in the typical compared French town, for comparison.
INSEE publishes no country of birth or ethnicity by commune in these tables, and the census doesn’t ask about religion.
Only 35% of residents 15 and over are married in Caix
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
Where a quarter of residents 15 and over are single in the typical compared French town, Caix has 23%. The comparison figure for married residents is 43% in the typical compared French town.
Caix: 28% of adults out of school have no qualification, above 86% 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
Graduates of higher education: 21% here and 30% in the typical compared French town. As a reference point, 19% of adults out of school have no qualification in the typical compared French town.
Ranked by age, 8th youngest of 41 French towns this size
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).
Caix sits below 5 of its 6 closest neighbors on median age
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Caix | 41.9 | 23% | 2.4% | 1% |
| Rosières-en-Santerre 2,894 · 2.5 mi | 46.9 | 27% | 0.9% | 2.3% |
| Villers-Bretonneux 4,647 · 6.8 mi | 41 | 18% | 0.6% | 1.7% |
| Moreuil 3,936 · 7.8 mi | 43.9 | 23% | 3% | 1.1% |
| Corbie 5,982 · 9.1 mi | 47.2 | 26% | 1.1% | 1.9% |
| Roye 5,833 · 10.1 mi | 42.8 | 22% | 2.1% | 3.7% |
| Boves 3,234 · 11.6 mi | 43.3 | 21% | 1.6% | 2.5% |
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 Caix
What is the population of Caix?
704 at INSEE’s 2023 census, 5% fewer than in 2012 (744).
How old are Caix’s residents?
The median age is 41.9, younger than 67% of compared French towns. 19% are under 18 and 23% 65 or older.
How many second homes are there in Caix?
8, with occasional dwellings: 2.4% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Caix?
INSEE counts 7 immigrants (born abroad, not French at birth), 1% of residents, and 7 foreign nationals (1%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Caix?
€24,460 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.