2% of homes are flats, fewer than in 99% of compared French towns
By its share of households headed by a manager or professional (24%), Plachy-Buyon is above 93% of compared French towns. 3.3% of households have no car, a lower share than in 98% of compared French towns. This Somme town is home to 897 residents in 390 households, by the 2023 Census. In Plachy-Buyon, 3.1% of households rent social housing (HLM).
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.
From 2012 to 2023, 69% of compared French towns grew faster than Plachy-Buyon: ±0%
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 Somme town changed −3% and the median compared French town +5%. Between 2012 and 2017 the population moved −2%, then +2% to 2023.
Residents aged 15 to 24: 7.5%, a lower share than 95% 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
■ Plachy-Buyon 46.9. The median compared French town: 44.
Half of Plachy-Buyon’s residents are over 46.9, older than in 69% of compared French towns. By way of comparison, 11% of residents are 15 to 24 in the typical compared French town.
Women and men · all residents
51% women, 49% men
About an even split. Median share of women: Somme 52.5%, France 51.8%.
Plachy-Buyon ranks below 95% of compared French towns on one-person households: 24%
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
28% of households are couples with children; in the typical compared French town the figure is 25%. Plachy-Buyon has more single-parent households than 78% of compared French towns, at 12%. As a yardstick, 35% of households are one person living alone in the typical compared French town. Average household size: 2.3 people.
Second homes: 0.3%, a lower share than 99% of compared French towns
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
The share of empty homes is 7.7%, against 6.7% in the typical compared French town. Across the comparison, 2.1% of homes are second homes in the typical compared French town. In the last two years, 5.6% of households moved in; at the other end, 27% have stayed 30 years or more.
Per consumption unit, the median standard of living is €31,330 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.
The midpoint of living standards here is €31,330 a year per consumption unit, higher than in 89% of compared French towns.
4.8% of households are headed by a manual worker, below 97% 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
Nearly a third of households are headed by a retired person in the typical compared French town, against 34% in Plachy-Buyon. The wider picture: 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).
Plachy-Buyon sits below 90% of compared French towns for immigrants (2.1%)
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.
Foreign nationals make up 0.8%, against 4.3% in the typical compared French town. The usual figure: 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.
Single residents: 17%, a lower share than 99% 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
Here 51% of residents 15 and over are married, where the figure in the typical compared French town is 43%. The benchmark for single residents in the typical compared French town: 25%.
Below 96% of compared French towns: 9.5% of adults out of school have no qualification
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 graduates of higher education (46%), Plachy-Buyon is above 90% of compared French towns. The wider picture: nearly a fifth of adults out of school have no qualification in the typical compared French town.
41 French towns of 897 to 2,582 people: this is the 15th 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).
Plachy-Buyon and its 6 nearest towns: 1 of them are older
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 Plachy-Buyon
What is the population of Plachy-Buyon?
897 at INSEE’s 2023 census, about the same as in 2012 (896).
How old are Plachy-Buyon’s residents?
The median age is 46.9, older than 69% of compared French towns. 20% are under 18 and 24% 65 or older.
How many second homes are there in Plachy-Buyon?
1, with occasional dwellings: 0.3% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Plachy-Buyon?
INSEE counts 19 immigrants (born abroad, not French at birth), 2.1% of residents, and 8 foreign nationals (0.8%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Plachy-Buyon?
€31,330 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.