Below 97% of compared French towns: 3% of households are headed by a manager or professional
4% of homes are flats; in the typical compared French town the figure is 30%. Sempigny had 760 residents in 330 households at the 2023 Census. One-person households make up about one in four here (26%). On residents aged 65 and over, Sempigny sits higher than three quarters of compared French towns: 27%.
Throughout this page, the Oise 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 Sempigny
Fewer residents than in 2012
Sempigny had 836 residents at the 2012 census and 760 in 2023, down 9%: slower growth than in 96% of compared French towns. Population ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
A −9% change since 2012: slower than 96% 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 −6%; from 2017 to 2023, −4%. Over the same years the median compared French town changed +5%, the median Oise town +2%.
Sempigny is older than 72% of compared French towns: a median age of 47.5
Shares of residents by age at the 2023 census.
Age groups · share of residents
Median age of the 3,798 compared French towns
■ Sempigny 47.5. The median compared French town: 44.
Residents aged 15 to 24 are about as common here as in the typical compared French town, at 11%.
Women and men · all residents
48% women, 52% men
About 108 men for every 100 women. Median share of women: Oise 51.7%, France 51.8%.
Fewer single-parent households than 84% of compared French towns: 7.6%
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 Oise median and the France median
Living alone · share
On average, 2.3 people share a household. The usual figure: one in ten households are single parents in the typical compared French town. Sempigny has more couples with children than 64% of compared French towns, at 28%.
7.3% of households have no car, fewer than in 71% 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
3% of households arrived within the last two years, while 34% have stayed 30 years or more. In the typical compared French town, 11% of households have no car. Households in social housing are rarer here than in 57% of compared French towns. At 1.9%, second homes sit close to the figure in the typical compared French town.
Half above, half below €25,630 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 midpoint of living standards here is €25,630 a year per consumption unit, lower than in 53% of compared French towns.
Sempigny ranks above 94% of compared French towns on households headed by a retired person: 46%
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
Households headed by a manual worker make up about one in eight here (13%). 3% of Sempigny’s households are headed by a manager or professional, against 9.4% in the median compared French town; 46% by a retired person (32%).
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
Immigrants make up 3.9% in Sempigny, less than in 74% 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.
The share of foreign nationals trails nearly four fifths of compared French towns: 2%. The benchmark for immigrants in the typical compared French town: 6.5%.
INSEE publishes no country of birth or ethnicity by commune in these tables, and the census doesn’t ask about religion.
Above 56% of compared French towns: 44% of residents 15 and over are married
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
26% of residents 15 and over are single. For married residents, the comparison in the typical compared French town is 43%.
In Sempigny, 19% of adults out of school hold a higher-education qualification, fewer than in 88% 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
In Sempigny, 21% of adults out of school have no qualification, beside 19% in the typical compared French town. The benchmark for graduates of higher education in the typical compared French town: 30%.
41 French towns of 760 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.
At the ends of the range sit Villejust (37.2), the youngest, and Prayssac (62.3), the oldest.
Every neighbor is younger than Sempigny
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Sempigny | 47.5 | 27% | 1.9% | 3.9% |
| Noyon 12,971 · 1.7 mi | 41.8 | 22% | 1.4% | 18% |
| Ribécourt-Dreslincourt 3,871 · 4.3 mi | 40.5 | 18% | 1.2% | 7.3% |
| Thourotte 4,463 · 7.4 mi | 47.2 | 27% | 0.8% | 6.8% |
| Longueil-Annel 2,586 · 8.5 mi | 42 | 20% | 1% | 6.6% |
| Choisy-au-Bac 3,449 · 9.5 mi | 44.9 | 25% | 2.3% | 6.6% |
| Chauny 11,596 · 10.8 mi | 44.1 | 23% | 1.7% | 7.2% |
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 Sempigny
What is the population of Sempigny?
760 at INSEE’s 2023 census, 9% fewer than in 2012 (836).
How old are Sempigny’s residents?
The median age is 47.5, older than 72% of compared French towns. 20% are under 18 and 27% 65 or older.
How many second homes are there in Sempigny?
7, with occasional dwellings: 1.9% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Sempigny?
INSEE counts 29 immigrants (born abroad, not French at birth), 3.9% of residents, and 15 foreign nationals (2%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Sempigny?
€25,630 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.