A median age of 53.1: Oust-Marest is older than 91% of compared French towns
45% of households are headed by a retired person, against 32% in the typical compared French town. Here, 3.3% of households are single parents. Few places have so few flats: 9.3% here, fewer than in 88% of compared French towns. The 2023 Census counted 608 residents in 300 households.
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 Oust-Marest
An older town
Half of Oust-Marest’s residents are under 53.1 and half over; the median of compared French towns is 44. 29% are 65 or older (France median 22%), 6.6% 80 or older. Ages ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
Oust-Marest changed by −4% from 2012 to 2023, slower than 84% 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
Here the change came as ±0% to 2017, then −3% to 2023.
A lower share of residents aged 15 to 24 than 99% of compared French towns, at 6%
Shares of residents by age at the 2023 census.
Age groups · share of residents
Median age of the 3,798 compared French towns
■ Oust-Marest 53.1. The median compared French town: 44.
Set against 22% in the typical compared French town, 29% of residents are 65 or over in Oust-Marest. On average, 11% of residents are 15 to 24 in the typical compared French town.
Women and men · all residents
54% women, 46% men
About 84 men for every 100 women. Median share of women: Somme 52.5%, France 51.8%. Women live longer than men, so towns with many older residents have more women.
A smaller share of couples with children than 68% of compared French towns: 21%
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 typical household size is 2 people. The benchmark for couples with children in the typical compared French town: 25%. One-person households: just over a third of the total.
Fewer households in social housing than 76% of compared French towns: 7%
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
Here 7.7% of homes stand empty, where the figure in the typical compared French town is 6.7%. Oust-Marest has fewer households without a car than three fifths of compared French towns, at 9%. On average, 12% of households rent social housing (HLM) in the typical compared French town. 7.3% of households arrived within the last two years, while 31% have stayed 30 years or more.
Standard of living at the median: €23,910 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.
At €23,910 a year per consumption unit, the median standard of living here is lower than in 72% of compared French towns.
In Oust-Marest, 6.7% of households are headed by a manager or professional, fewer than in 71% 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
On the census count, 13% of households are headed by a manual worker. The usual figure: 9.4% of households are headed by a manager or professional in the typical compared French town.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
1.1% of residents are immigrants, below 99% 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.
0.8% of residents are foreign nationals (typical compared French town: 4.3%). 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.
Only 15% of residents 15 and over are single in Oust-Marest
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 43% of residents 15 and over are married in the typical compared French town, Oust-Marest has 49%. Single residents make up 25% in the typical compared French town.
A larger share of adults with no qualification than 95% of compared French towns: 32%
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
19% of adults out of school hold a higher-education qualification (typical compared French town: 30%).
The 7th oldest of 41 French towns of 608 to 2,582 people
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.
Around Oust-Marest, 4 of 6 towns have a higher 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 |
|---|---|---|---|---|
| Oust-Marest | 53.1 | 29% | 2.7% | 1.1% |
| Eu 6,499 · 2.2 mi | 55.2 | 35% | 5.9% | 2.8% |
| Mers-les-Bains 2,540 · 3.7 mi | 58.3 | 38% | 50% | 1.7% |
| Le Tréport 4,378 · 4.3 mi | 53.2 | 32% | 37% | 1.8% |
| Friville-Escarbotin 4,306 · 4.6 mi | 47.5 | 26% | 2.8% | 1.7% |
| Criel-sur-Mer 2,527 · 6.6 mi | 54.9 | 33% | 44% | 2.6% |
| Blangy-sur-Bresle 2,819 · 10.3 mi | 51.1 | 30% | 1.8% | 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 Oust-Marest
What is the population of Oust-Marest?
608 at INSEE’s 2023 census, 4% fewer than in 2012 (631).
How old are Oust-Marest’s residents?
The median age is 53.1, older than 91% of compared French towns. 17% are under 18 and 29% 65 or older.
How many second homes are there in Oust-Marest?
9, with occasional dwellings: 2.7% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Oust-Marest?
INSEE counts 7 immigrants (born abroad, not French at birth), 1.1% of residents, and 5 foreign nationals (0.8%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Oust-Marest?
€23,910 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.