In Sézanne, 16% of homes stand empty, more than in 97% of compared French towns
Households headed by a retired person: 39% here and 32% in the typical compared French town. Put another way, about one in five: 20% of households rent social housing (HLM). Nearly one in ten residents are 15 to 24, a lower share than in 83% of compared French towns. There were 2,270 households in Sézanne at the 2023 Census, home to 4,576 residents.
Throughout this page, the Marne 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 Sézanne
Fewer residents than in 2012
Sézanne had 5,160 residents at the 2012 census and 4,576 in 2023, down 11%: slower growth than in 98% of compared French towns. Population ↓
Empty homes
The census found 450 homes empty (16%): for sale, to let, awaiting work or simply unused. Homes & cars ↓
An older town
Half of Sézanne’s residents are under 50.7 and half over; the median of compared French towns is 44. 30% are 65 or older (France median 22%), 10% 80 or older. Ages ↓
Many people living alone
47% of Sézanne’s households are one person: higher than in 88% of compared French towns; 32% of residents 65 and over live alone. Households ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
Sézanne changed by −11% from 2012 to 2023, behind 98% 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, −5%.
Sézanne is older than 85% of compared French towns: a median age of 50.7
Shares of residents by age at the 2023 census.
Age groups · share of residents
Median age of the 3,798 compared French towns
■ Sézanne 50.7. The median compared French town: 44.
Here 30% of residents are 65 or over, where the figure in the typical compared French town is 22%.
Women and men · all residents
53% women, 47% men
About 88 men for every 100 women. Median share of women: Marne 52.7%, France 51.8%. Women live longer than men, so towns with many older residents have more women.
Couples with children: 16%, a lower share than 89% 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 Marne median and the France median
Living alone · share
Set against 10% in the typical compared French town, 8.8% of households are single parents in Sézanne. By way of comparison, 25% of households are couples with children in the typical compared French town. 47% of households are one person living alone, or about one in two.
Above 79% of compared French towns: 18% of households have no car
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
Some one in ten households are newcomers of under two years, against 19% who have been there 30 years or more. Typically, just over one in ten households have no car in the typical compared French town. Here, 34% of homes are flats. On second homes, Sézanne sits higher than 62% of compared French towns: 3%.
A median standard of living of €24,370 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.
Per consumption unit, half of residents live on more than €24,370 a year: lower than in 67% of compared French towns. 18.0% of residents have a standard of living below 60% of France’s median.
Sézanne ranks above 79% of compared French towns on households headed by a manual worker: 19%
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
Set against 9.4% in the typical compared French town, 6.4% of households are headed by a manager or professional in Sézanne. Measured more widely, 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).
Sézanne ranks above 69% of compared French towns on foreign nationals: 6.9%
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.
Nearly one in ten residents are immigrants; in the typical compared French town the figure is 6.5%. Immigrants make up a share higher than in 62% of compared French towns; the median compared commune in Marne has 4.9%. The benchmark for foreign nationals in the typical compared French town: 4.3%.
INSEE publishes no country of birth or ethnicity by commune in these tables, and the census doesn’t ask about religion.
Only 39% of residents 15 and over are married in Sézanne
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
Against a figure of 25% in the typical compared French town, the share of single residents in Sézanne comes in at 29%. The wider picture: 43% of residents 15 and over are married in the typical compared French town.
Adults with no qualification make up 32% in Sézanne, more than in 94% 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 the typical compared French town, 30% of adults out of school hold a higher-education qualification; in Sézanne, 19%.
The 5th oldest of 41 French towns of 4,529 to 4,619 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 37.1 in Crespin to 63 in Leucate.
Sézanne is younger than 1 of its 3 nearest neighbors
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Sézanne | 50.7 | 30% | 3% | 8.3% |
| Villenauxe-la-Grande 2,605 · 11.8 mi | 41.3 | 22% | 3.5% | 9.4% |
| Montmirail 3,535 · 13.3 mi | 51.3 | 32% | 3.4% | 5.2% |
| Romilly-sur-Seine 14,959 · 14.3 mi | 42.8 | 23% | 2.7% | 17% |
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 Sézanne
What is the population of Sézanne?
4,576 at INSEE’s 2023 census, 11% fewer than in 2012 (5,160).
How old are Sézanne’s residents?
The median age is 50.7, older than 85% of compared French towns. 18% are under 18 and 30% 65 or older.
How many second homes are there in Sézanne?
85, with occasional dwellings: 3% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Sézanne?
INSEE counts 380 immigrants (born abroad, not French at birth), 8.3% of residents, and 310 foreign nationals (6.9%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Sézanne?
€24,370 a year per consumption unit in 2023 (median of compared French towns €25,970); 18.0% of residents live below the poverty line. 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.