Saint-Cyr-sous-Dourdan ranks below 99% of compared French towns on households in social housing: 0.2%
With a median age of 49.1, Saint-Cyr-sous-Dourdan is older than nearly four fifths of compared French towns. Households headed by a manager or professional make up about one in three here (32%). The 2023 Census put the town’s population at 982, in 420 households. Against a figure of 11% in the typical compared French town, the share of households without a car in Saint-Cyr-sous-Dourdan comes in at 3.5%.
Throughout this page, the Essonne 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 Saint-Cyr-sous-Dourdan
Many graduates
48% of residents 15 and over who have left education hold a diploma above the bac, 20% a master’s or more (bac+5). Qualifications ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
A −2% change since 2012: slower than 80% 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 population moved −3%, and from 2017 to 2023 ±0%; the median compared French town changed +5% and the median Essonne town +6%.
Saint-Cyr-sous-Dourdan ranks below 75% of compared French towns on residents aged 15 to 24: 9.4%
Shares of residents by age at the 2023 census.
Age groups · share of residents
Median age of the 3,798 compared French towns
■ Saint-Cyr-sous-Dourdan 49.1. The median compared French town: 44.
The figure for residents aged 65 and over is 20% in Saint-Cyr-sous-Dourdan and 22% in the typical compared French town. As a yardstick, 11% of residents are 15 to 24 in the typical compared French town.
Women and men · all residents
50% women, 50% men
About an even split. Median share of women: Essonne 51.3%, France 51.8%.
Fewer one-person households than 82% of compared French towns: 29%
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 Essonne median and the France median
Living alone · share
The share of couples with children tops just over three quarters of compared French towns: 30%. Saint-Cyr-sous-Dourdan has fewer single-parent households than just over four fifths of compared French towns, at 7.9%. For one-person households, the comparison in the typical compared French town is 35%. Average household size: 2.3 people.
In Saint-Cyr-sous-Dourdan, 5.3% of homes are flats, fewer than in 95% 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
24% of households have been in place 30 years or more; 7% moved in within the last two years. Compared with other places, empty homes are common here: 11%, more than in 82% of compared French towns. What’s more, the figure for second homes is 4.2% in Saint-Cyr-sous-Dourdan and 2.1% in the typical compared French town.
Standard of living at the median: €33,540 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.
Half of Saint-Cyr-sous-Dourdan’s residents live in households with a standard of living below €33,540 a year per consumption unit, and half above: higher than in 94% of compared French towns.
Fewer households headed by a manual worker than 95% of compared French towns: 5.7%
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
26% of households are headed by a retired person (typical compared French town: 32%). The share of households headed by a manual worker in the typical compared French town is 14%.
Each household is counted once, by the occupation of its reference person (usually the oldest working adult).
Immigrants make up 5.8% of Saint-Cyr-sous-Dourdan’s residents
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 median compared commune in Essonne has 13%; immigrants here make up a share lower than in 56% of compared French towns. Put another way, about one in 17: 5.8% of residents are immigrants. Foreign nationals are about as common here as in the typical compared French town, at 3.9%.
INSEE publishes no country of birth or ethnicity by commune in these tables, and the census doesn’t ask about religion.
49% of residents 15 and over are married, a share 86% of compared French towns don’t reach
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
Just over a fifth of residents 15 and over are single; in the typical compared French town the figure is 25%. In the typical compared French town, the share of married residents is 43%.
A larger share of graduates of higher education than 91% of compared French towns: 48%
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 just over one in ten adults out of school have no qualification, where the figure in the typical compared French town is 19%. For graduates of higher education, the comparison in the typical compared French town is 30%.
15th highest median age among 41 French towns of 982 to 2,582
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).
Saint-Cyr-sous-Dourdan is older than every town around it
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Saint-Cyr-sous-Dourdan | 49.1 | 20% | 4.2% | 5.8% |
| Dourdan 11,415 · 2.9 mi | 40.6 | 18% | 2.2% | 15% |
| Saint-Chéron 5,132 · 4 mi | 41.6 | 18% | 13% | 9.8% |
| Saint-Arnoult-en-Yvelines 5,875 · 4.7 mi | 45.8 | 23% | 2.5% | 8.6% |
| Forges-les-Bains 4,241 · 4.8 mi | 39.5 | 15% | 2.2% | 8.6% |
| Limours 6,517 · 5.6 mi | 44.2 | 21% | 1.7% | 12% |
| Briis-sous-Forges 3,342 · 5.7 mi | 44 | 19% | 1.4% | 7.4% |
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 Saint-Cyr-sous-Dourdan
What is the population of Saint-Cyr-sous-Dourdan?
982 at INSEE’s 2023 census, 2% fewer than in 2012 (1,007).
How old are Saint-Cyr-sous-Dourdan’s residents?
The median age is 49.1, older than 79% of compared French towns. 20% are under 18 and 20% 65 or older.
How many second homes are there in Saint-Cyr-sous-Dourdan?
21, with occasional dwellings: 4.2% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Saint-Cyr-sous-Dourdan?
INSEE counts 57 immigrants (born abroad, not French at birth), 5.8% of residents, and 38 foreign nationals (3.9%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Saint-Cyr-sous-Dourdan?
€33,540 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.