Flats make up 0.9% in Sermaize, less than in 99% of compared French towns
The share of empty homes is 3.2%, against 6.7% in the typical compared French town. 271 residents in 110 households: that is Sermaize at the 2023 Census. Across Sermaize, nearly a third of households are headed by a manual worker. Higher than in 87% of compared French towns: 33% of households are couples with children.
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.
Growth of +12% since 2012 puts Sermaize ahead of 75% 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, +2% in Oise.
A median age of 40.4: Sermaize is younger than 77% 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
■ Sermaize 40.4. The median compared French town: 44.
By its share of residents aged 65 and over (17%), Sermaize is below 80% of compared French towns. About one in nine: that is how common residents aged 15 to 24 are in Sermaize (11%).
Women and men · all residents
53% women, 47% men
About 89 men for every 100 women. Median share of women: Oise 51.7%, France 51.8%.
22% of households are one person living alone, below 98% of compared French towns
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
A household here holds 2.6 people on average. One-person households: 35% in the typical compared French town, for comparison. 14% of households are single parents, a higher share than in 90% of compared French towns.
A lower share of households without a car than 76% of compared French towns, at 6.6%
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. Typically, just over one in ten households have no car in the typical compared French town. Locally, 1.1% of homes are second homes.
Median standard of living: €24,070 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 €24,070 a year per consumption unit, lower than in 71% of compared French towns.
Above 68% of compared French towns: 36% of households are headed by a retired person
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 manager or professional: nearly a tenth of the total. For households headed by a retired person, the comparison in the typical compared French town is 32%.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
4.2% of residents are immigrants, below 72% 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.
Foreign nationals make up about one in 23 here (4.3%). 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.
Sermaize ranks above 94% of compared French towns on married residents: 51%
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 24% of residents 15 and over are single, where the figure in the typical compared French town is 25%. The share of married residents in the typical compared French town is 43%.
21% of adults out of school hold a higher-education qualification, fewer than in 82% 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
Here, 20% of adults out of school have no qualification. The benchmark for graduates of higher education in the typical compared French town: 30%.
Of 41 French towns its size (271 to 2,582 people), the 4th 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.
The youngest is Villejust (37.2), the oldest Prayssac (62.3).
No nearby town is as young as Sermaize
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Sermaize | 40.4 | 17% | 1.1% | 4.2% |
| Noyon 12,971 · 3.2 mi | 41.8 | 22% | 1.4% | 18% |
| Ribécourt-Dreslincourt 3,871 · 7.1 mi | 40.5 | 18% | 1.2% | 7.3% |
| Roye 5,833 · 9.6 mi | 42.8 | 22% | 2.1% | 3.7% |
| Thourotte 4,463 · 10 mi | 47.2 | 27% | 0.8% | 6.8% |
| Ham 4,378 · 10.6 mi | 45.8 | 25% | 1% | 2.8% |
| Longueil-Annel 2,586 · 11.1 mi | 42 | 20% | 1% | 6.6% |
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 Sermaize
What is the population of Sermaize?
271 at INSEE’s 2023 census, 12% more than in 2012 (242).
How old are Sermaize’s residents?
The median age is 40.4, younger than 77% of compared French towns. 23% are under 18 and 17% 65 or older.
How many second homes are there in Sermaize?
1, with occasional dwellings: 1.1% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Sermaize?
INSEE counts 11 immigrants (born abroad, not French at birth), 4.2% of residents, and 12 foreign nationals (4.3%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Sermaize?
€24,070 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.