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Bailly

Bailly has 3,690 residents and 1,717 homes, 38% of them houses. Homes sold for a median €4,480/m² over five years, 12% above the département figure. The median living standard is €38,230 a year. Around the town hall, 84 everyday shops and services are within a 15-minute walk.

Commune · Insee 78043 · Postcode 78870 · Updated 24 October 2026
3,690residents2022 census
€4,480/m²median price per m²Yvelines : €4,010/m²
8%green space within 500 maround the town hall
84services within a 15-minute walkaround the town hall
Bailly in YvelinesBailly highlighted; the rest of the département in grey
Map of Yvelines with Bailly highlighted

Sources: IGN and Insee, IRIS boundaries and Admin Express 2024 (Open Licence 2.0) · © OpenStreetMap contributors (ODbL)

People.

3,690 residents and 1,574 households at the 2022 census, next to the département figure.

18%
aged under 15
14%
aged 15–29
29%
aged 60 and over
33%
of households are people living alone
32%
of households are couples with children
9%
of households are single-parent families

Source: Insee, 2022 population census (sub-municipal files, Open Licence 2.0)

Homes.

1,717 homes, 92% of them main residences, with 4.6 rooms on average.

38%
of homes are houses
78%
of households own their home
7%
of households rent social housing (HLM)
3%
second homes
5%
empty homes
93%
of households have a car

When main homes were built

before 19195%
1919–19452%
1946–197019%
1971–199057%
1991–20059%
2006–20198%

Source: Insee, 2022 population census (sub-municipal files, Open Licence 2.0)

Property prices.

254 house and flat sales over five years.

€4,480/m²median price, houses and flatsYvelines : €4,010/m²
€4,040/m²flats153 sales
€5,630/m²houses101 sales

Median prices from sales published in France’s Demandes de valeurs foncières (DVF) over ten half-years, for sales of a single property. Individual sales are not shown. A median is only given where there were at least ten sales.

Source: DGFiP property sales (DVF), data.gouv.fr statistics (Open Licence 2.0)

Income and work.

Median living standard of €38,230 a year in 2021.

€38,230median living standard a year2021
€18,760the lowest-income 10% live on less than1st decile
€67,460the highest-income 10% live on more than9th decile
5.3%
unemployment among 15–64s (census definition)
70%
of over-15s who have left school hold a higher-education degree
30%
managers and professionals among over-15s
29%
retired among over-15s

Living standard is a household’s disposable income after taxes and benefits, divided by its consumption units. Half of residents live on less than the median. Income on its own says nothing about what a neighbourhood is like to live in.

Sources: Insee, Filosofi 2021 income data (Open Licence 2.0) · Insee, 2022 population census (sub-municipal files, Open Licence 2.0)

Safety.

Offences recorded in 2025, with the rate per 1,000 residents and the change from 2024.

Indicator2025RateChange
Burglaries of homes2313.4 per 1,000+15%
Thefts from people without violence92.4 per 1,000−53%
Vehicle thefts51.3 per 1,000−58%
Deliberate damage and vandalism133.5 per 1,000−67%
Fraud and payment card fraud215.6 per 1,000−55%

These figures count offences recorded by the police and gendarmerie, not how safe a place feels, and not every offence is reported. Rates are per 1,000 residents (per 1,000 homes for burglaries): where many people visit but few live, as in town centres and shopping areas, they are naturally higher. Small counts are not published.

Source: Ministry of the Interior (SSMSI), recorded crime by municipality 2024–2025 (Open Licence 2.0)

Everyday life.

What is within one kilometre of the town hall. 13 public transport stops are within 800 m, and the nearest rail or tram station is 430 m away.

Supermarkets and convenience shops4
Bakeries2
Pharmacies2
Doctors0
Dentists1
Cafés and bars1
Restaurants3
Parks and gardens5
Playgrounds3
Sports pitches20
Gyms and sports halls3
Libraries1
Nurseries and childcare1
Bus stops11
Tram and metro stops3
Railway stations1

Source: © OpenStreetMap contributors (ODbL)

Health, shops and services.

Facilities and services in Bailly on 1 January 2025, from Insee’s permanent database of facilities.

8.1GPs per 10,000 residentsdépartement: 6.5
1pharmacieson 1 January 2025
4food storessupermarkets, convenience stores, grocers
General practitioners3
Dentists3
Nurses4
Physiotherapists8
Pharmacies1
Convenience stores and grocers4
Bakeries1
EV charging stations5
Post offices and postal points1
Banks2
Restaurants7
Nurseries2
Libraries1

Insee’s permanent database of facilities lists the shops, services and health professionals present in each commune on 1 January. Health professionals in private practice are counted one by one; several may work at the same address.

Source: Insee, permanent database of facilities 2025 (Open Licence 2.0)

Natural and industrial hazards.

Major hazards the State lists for Bailly, prevention plans in force and natural-disaster declarations since 1982.

4natural-disaster declarationssince 1999
April 2022latest recognised eventDrought (clay shrinkage)

Natural-disaster declarations by type

Floods and mudflows2
Ground movement1
Drought (clay shrinkage)1

A natural-disaster declaration (arrêté CatNat) lets insurers pay out for the damage. The count reflects past events, not a forecast of future risk. The list of hazards comes from each département’s major-risk file; a prevention plan in force limits building in exposed zones.

Source: Géorisques, GASPAR database (Open Licence 2.0), as of 5 October 2026

Schools.

5 primary and nursery schools, 2 collèges and 2 lycées are open here, 2 of them state schools.

Ecole secondaire privée International Montessori AthénaLower secondary (collège) · private
Ecole secondaire privée NLC International SchoolLower secondary (collège) · private
Ecole maternelle Louis PasteurNursery school · state
Ecole primaire privée Bilingue Montessori NLC 78Primary school · private
Ecole primaire privée International Montessori AthénaPrimary school · private
Ecole primaire privée Saint BernardPrimary school · private
Ecole élémentaire La PépinièrePrimary school · state
Ecole 2D degré général privée Saint BernardUpper secondary (lycée) · private
Ecole 2D degré général privée International Montessori AthénaUpper secondary (lycée) · private

Source: Ministry of Education, school directory (Open Licence 2.0). Admission depends on catchment rules and each school’s own policy.

Nearby communes.

The communes in the département whose town halls are closest.