In Montagnieu, 2.3% of households have no car, fewer than in 99% of compared French towns
By its share of households in social housing (2.4%), Montagnieu is below 96% of compared French towns. In Montagnieu, 26% of households are headed by a manual worker. 30% of households are couples with children, a higher share than in 77% of compared French towns. This Ain town had 668 residents in 280 households at the 2023 census.
Throughout this page, the Ain 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 Montagnieu
One home in 10 is a second home
The census counted 36 second homes and occasional dwellings in Montagnieu, 10% of its 350 homes: higher than in 88% of compared French towns. 86% of them are houses. Their owners live elsewhere, so they aren’t in the population figures on this page. Homes & cars ↓
Growing fast
Montagnieu had 537 residents at the 2012 census and 668 in 2023, up 24%: faster growth than in 94% of compared French towns. Population ↓
Written from INSEE’s census 2023 on this page, against compared French towns.
In Montagnieu, 10% of homes are second homes, more than in 88% 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
With empty homes at 9.3%, Montagnieu is ahead of 75% of compared French towns on that count. The benchmark for second homes in the typical compared French town: 2.1%. Locally, 12% of homes are flats.
Montagnieu grew +24% from 2012 to 2023, ahead of 94% 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
Over those years, the median Ain town changed +13% and the median compared French town +5%. Between 2012 and 2017 the population moved +16%, then +7% to 2023.
A median age of 40.4: Montagnieu 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
■ Montagnieu 40.4. The median compared French town: 44.
Residents aged 15 to 24: 10% here and 11% in the typical compared French town. Put another way, about one in five: 20% of residents are 65 or over.
Women and men · all residents
51% women, 49% men
About 94 men for every 100 women. Median share of women: Ain 51.0%, France 51.8%.
A smaller share of one-person households than 69% of compared French towns: 31%
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 Ain median and the France median
Living alone · share
Each household has 2.4 people on average. Few places have as many single-parent households: 12% here, more than in 77% of compared French towns. To put it in context, 35% of households are one person living alone in the typical compared French town.
Median standard of living: €25,380 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.
Living standards centre on €25,380 a year per consumption unit: lower than in 56% of compared French towns.
Households headed by a manager or professional make up 4.9% in Montagnieu, less than in 86% 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
Here, nearly a third of households are headed by a retired person. As a yardstick, nearly one in ten 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).
3.7% of residents are immigrants, fewer than in 76% 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.
Set against 4.3% in the typical compared French town, 2% of residents are foreign nationals in Montagnieu. In the typical compared French town, the share of immigrants is 6.5%.
INSEE publishes no country of birth or ethnicity by commune in these tables, and the census doesn’t ask about religion.
Only 42% of residents 15 and over are married in Montagnieu
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, 26% of residents 15 and over are single. In the median compared French town 43% are married and 6.1% in a PACS; here it is 42% and 9.2%, and 4.1% are widowed.
Only 25% of adults out of school hold a higher-education qualification in Montagnieu
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, nearly a fifth of adults out of school have no qualification; in Montagnieu, 15%. Measured more widely, 30% of adults out of school hold a higher-education qualification in the typical compared French town.
The 4th youngest of 41 French towns of 668 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.
At the ends of the range sit Villejust (37.2), the youngest, and Prayssac (62.3), the oldest.
5 of 6 neighbors are older than Montagnieu
The nearest towns of 2,500 or more, colored by median age. Source: INSEE, census 2023.
| Town | Median age | 65+ | Second homes | Immigrants |
|---|---|---|---|---|
| Montagnieu | 40.4 | 20% | 10% | 3.7% |
| Montalieu-Vercieu 3,510 · 3.1 mi | 38.3 | 16% | 4.1% | 5% |
| Morestel 4,340 · 8 mi | 46.2 | 26% | 1.3% | 7.6% |
| Lagnieu 7,411 · 9.3 mi | 43.1 | 23% | 2.1% | 7.3% |
| Belley 9,388 · 11.2 mi | 46.5 | 26% | 3% | 13% |
| Crémieu 3,536 · 11.3 mi | 43.3 | 21% | 4.3% | 9.6% |
| Saint-Chef 3,921 · 11.6 mi | 43.3 | 19% | 2.1% | 4.1% |
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 Montagnieu
What is the population of Montagnieu?
668 at INSEE’s 2023 census, 24% more than in 2012 (537).
How old are Montagnieu’s residents?
The median age is 40.4, younger than 77% of compared French towns. 25% are under 18 and 20% 65 or older.
How many second homes are there in Montagnieu?
36, with occasional dwellings: 10% of all homes, against 2.1% for the median compared French town.
How many immigrants live in Montagnieu?
INSEE counts 25 immigrants (born abroad, not French at birth), 3.7% of residents, and 14 foreign nationals (2%). The medians of compared French towns are 6.5% and 4.3%.
What is the median income in Montagnieu?
€25,380 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 8, 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.