In Groslay, the council took a second round
François Jeffroy has been mayor of Groslay since March 29, 2026, elected by the 29 members of the municipal council. At the March 2026 municipal elections, GROSLAY TERRE D'AVENIR won 22 of the 29 seats in the second round on March 22, 2026, with 50.9% of the votes. Groslay is part of the Communauté d'agglomération Plaine Vallée.
March 2032
Councils are elected for six years; the council elects the mayor.
Register to vote ↗Throughout this page, the median in Val-d'Oise and the France median are the median of compared communes (those with an overall grade), each figure its own median.
What stands out about Groslay’s town hall
Decided in a second round
No list won half the votes in the first round, when 4 lists stood. In the second round on March 22, 2026, GROSLAY TERRE D'AVENIR came first with 50.9% and took 22 of the 29 seats; the other lists share the remaining 7. Who’s in charge ↓
Turnout above most communes
62.9% of registered voters in Groslay voted on March 15, 2026: higher than in 76% of compared French communes. The median of compared communes in Val-d'Oise was 52.1%; across France, 57.4%. 2026 elections ↓
Results as the Interior ministry published them; accounts from the DGFiP via OFGL. Nothing here is graded.
The council the voters chose
Seats as the March 2026 results gave them, one dot a seat.
- GROSLAY TERRE D'AVENIR222 community seats
- AGIR ENSEMBLE POUR GROSLAY71 community seat
As elected in the second round, March 22, 2026.
The list that comes first gets half the seats; the rest are shared in proportion among the lists with 5% or more, the winner included. So the winning list always has a majority. The same vote gave Groslay 3 seats on the council of the Communauté d'agglomération Plaine Vallée (community seats).
Source: Interior ministry, 2026 municipal election results (March 15 and 22), subject to corrections and appeals.
4 authorities share the work
The commune is the tier closest to residents; the intercommunality, the département and the région do the rest.
Births, marriages and deaths, the electoral roll, nursery and primary schools, local roads, planning permission, the municipal police, and what else the council takes on.
Mayor: François Jeffroy · 29 councilors
The services its communes share: usually waste collection, economic development and planning documents; often water and local buses.
Social aid (RSA, care for older and disabled people, child protection), collèges, the département’s roads, and funding for fire and rescue.
Lycées, regional trains (TER) and coaches, economic development and job training.
Who to ask
The usual split of powers (service-public.fr); an intercommunality’s exact remit varies, so check its website for waste, water and buses.
Membership: COG 2026 (INSEE); intercommunality type: BANATIC, January 2025. What each tier does: service-public.fr.
From the mayor to the intercommunality
The officials as the Interior ministry’s register lists them, and the council by list.
- 1Mayorsince March 29, 2026François Jeffroy
- 2Deputy mayors8 adjoints, elected by the councilBouchra DerkaouiPierre FarcyIsmène BerionSergio AlbarelloCarmela DegliameGildas FouedjeuNathalie JobardHamza Zemmouri
- 3Groslay municipal council29 seats by listGROSLAY TERRE D'AVENIR 22 · AGIR ENSEMBLE POUR GROSLAY 7
- 4Communauté d'agglomération Plaine ValléeGroslay holds 3 seatsCommunity councilors are drawn from the council lists in the same vote.
Source: Interior ministry, national register of elected officials (RNE), August 11, 2026.
The 29 members of the Groslay municipal council
The mayor and 8 deputy mayors first, then the councilors.
| Name | Office | Since |
|---|---|---|
| François Jeffroy | Maire | March 29, 2026 |
| Bouchra Derkaoui | 1er adjoint au Maire | March 29, 2026 |
| Pierre Farcy | 2ème adjoint au Maire | March 29, 2026 |
| Ismène Berion | 3ème adjoint au Maire | March 29, 2026 |
| Sergio Albarello | 4ème adjoint au Maire | March 29, 2026 |
| Carmela Degliame | 5ème adjoint au Maire | March 29, 2026 |
| Gildas Fouedjeu | 6ème adjoint au Maire | March 29, 2026 |
| Nathalie Jobard | 7ème adjoint au Maire | March 29, 2026 |
| Hamza Zemmouri | 8ème adjoint au Maire | March 29, 2026 |
Show the full council (29)
| Name | Office | Since |
|---|---|---|
| François Jeffroy | Maire | March 29, 2026 |
| Bouchra Derkaoui | 1er adjoint au Maire | March 29, 2026 |
| Pierre Farcy | 2ème adjoint au Maire | March 29, 2026 |
| Ismène Berion | 3ème adjoint au Maire | March 29, 2026 |
| Sergio Albarello | 4ème adjoint au Maire | March 29, 2026 |
| Carmela Degliame | 5ème adjoint au Maire | March 29, 2026 |
| Gildas Fouedjeu | 6ème adjoint au Maire | March 29, 2026 |
| Nathalie Jobard | 7ème adjoint au Maire | March 29, 2026 |
| Hamza Zemmouri | 8ème adjoint au Maire | March 29, 2026 |
| Yann Alexandre | Conseiller municipal | March 22, 2026 |
| Samia Belkhir | Conseiller municipal | March 22, 2026 |
| Régine Bultel | Conseiller municipal | March 22, 2026 |
| Patrick Cancouet | Conseiller municipal | March 22, 2026 |
| Ghislaine Chauveau | Conseiller municipal | March 22, 2026 |
| Francis Chenin | Conseiller municipal | March 22, 2026 |
| Ferdinando Cito | Conseiller municipal | March 22, 2026 |
| Marc Clouet | Conseiller municipal | March 22, 2026 |
| Emilie Elaïdi | Conseiller municipal | March 22, 2026 |
| Jimmy Fernandes | Conseiller municipal | March 22, 2026 |
| Philippe Hercyk | Conseiller municipal | March 22, 2026 |
| Régine Joyeau | Conseiller municipal | March 22, 2026 |
| Anne Lesur | Conseiller municipal | March 22, 2026 |
| Myriam Marmeche | Conseiller municipal | March 22, 2026 |
| Daniel Meï | Conseiller municipal | March 22, 2026 |
| Eric Morlot | Conseiller municipal | March 22, 2026 |
| Johanna Nedelec | Conseiller municipal | March 22, 2026 |
| Jennifer Nunes | Conseiller municipal | March 22, 2026 |
| Marcel Rey | Conseiller municipal | March 22, 2026 |
| Anna Rut Saulnier-Pieper | Conseiller municipal | March 22, 2026 |
Names and offices as the Interior ministry’s national register of elected officials (RNE) published them on August 11, 2026, written as it writes them. Public role only. Later resignations and replacements aren’t shown.
The council: same source as Who represents Groslay, above.
How Groslay voted in March 2026
4 lists stood in the first round; none won half the votes, so a second round followed.
3,419 votes cast for a list
3,474 of 5,317 registered voters in Groslay voted.
34 blank and 21 spoilt ballots, not counted in the shares.
3,276 votes cast for a list · no seats given out: a second round followed
3,343 of 5,313 registered voters in Groslay voted.
40 blank and 27 spoilt ballots, not counted in the shares.
Turnout, first round · March 15, 2026
Shares are of the votes cast for a list, leaving out blank and spoilt ballots. Lists in vote order; the colors only tell the lists apart.
2026 elections: same source as Who’s in charge, above.
Groslay spends €1,178 per resident a year
The commune’s consolidated accounts: main and annexed budgets, transfers between them removed.
Per resident, 2025 · against compared communes
Spending and debt per resident, 2018 to 2025
Groslay owed €6.2M at the end of 2025, €732 per resident, lower than in 51% of compared French communes, equal to 80% of a year’s running costs.
Show year by year
| Year | Spending | Investment | Debt | Debt in all |
|---|---|---|---|---|
| 2025 | €1,178 | €263 | €732 | €6.2M |
| 2024 | €1,405 | €469 | €855 | €7.2M |
| 2023 | €1,254 | €355 | €728 | €6.2M |
| 2022 | €1,133 | €238 | €838 | €7.2M |
| 2021 | €1,047 | €115 | €944 | €8.1M |
| 2020 | €1,221 | €247 | €1,188 | €10.5M |
| 2019 | €1,352 | €412 | €1,348 | €11.9M |
| 2018 | €1,132 | €212 | €1,465 | €12.8M |
Source: OFGL, consolidated commune accounts 2018–2025 (DGFiP); 2025 provisional.
The 16th lowest debt per resident of 41 communes its size
The 40 compared communes nearest in population, debt per resident at the end of 2025.
Lowest: Pignan, €159. Highest: Marseillan, €4,077.
Have a say in Groslay
French citizens register online or at the town hall; citizens of other EU countries can vote in municipal elections too.
service-public.fr ↗See where you’re registered and which polling station is yours.
service-public.fr ↗Council meetings are public; the agenda and minutes are posted at the town hall and usually on its website.
service-public.fr ↗Opening hours, address and phone number of the mairie of Groslay in the public services directory.
lannuaire.service-public.fr ↗Who can stand, how lists are formed and the deadlines, from the Interior ministry.
interieur.gouv.fr ↗What this data can and can’t tell you
- Mayors and councilors. From the Interior ministry’s national register of elected officials (RNE) as published on August 11, 2026: name, office and start dates, nothing else. The register counts a mayor as a councilor too; the page counts each person once. It isn’t a live roll: resignations and replacements after that date aren’t shown, and no party is inferred for any official.
- How the council is elected. Since March 2026 every commune elects its council from lists (a 2025 law extended list voting to communes under 1,000). A list with more than half the votes in the first round wins; otherwise lists with 10% or more can go on to a second round, where the list ahead wins. It gets half the seats, and the rest are shared in proportion among lists with 5% or more. The council then elects the mayor and the deputy mayors.
- The label beside a list. The political nuance the prefecture gave the list for the ministry’s results (Divers droite, Union de la gauche…), shown as published. It isn’t the list’s own description; many lists, most in small communes, have none.
- The commune’s money. OFGL’s consolidated accounts from the DGFiP, 2018 to 2025; 2025 is provisional. Spending and investment leave out loan repayments; running costs are part of spending. Debt is what was owed at the end of the year.
- Per resident. Divided by the DGFiP’s population for that year (population totale, which counts some people, such as boarding students, in two communes), so it can differ from the census figure elsewhere on the site.
- The medians. Beside the town’s figure, the median of compared communes in its département and in France (those with an overall grade). A commune’s spending follows its size and its role: one that runs a pool or a theater for the villages around it spends more per resident.
Questions about Groslay’s town hall
Who is the mayor of Groslay?
François Jeffroy, mayor since March 29, 2026, according to the Interior ministry’s register of elected officials (August 11, 2026).
How many councilors does Groslay have?
The Groslay municipal council has 29 members, the mayor and 8 deputy mayors included.
Who won the 2026 municipal elections in Groslay?
GROSLAY TERRE D'AVENIR, in the second round on March 22, 2026, with 50.9% of the votes; it holds 22 of the 29 seats.
What was the turnout in Groslay?
62.9% of registered voters voted in the first round on March 15, 2026; the median of compared French communes was 57.4%.
When are the next municipal elections in Groslay?
Councils are elected for six years, so the next general municipal elections are due in March 2032. A council can be re-elected sooner if it loses too many members.
How much debt does Groslay have?
€6.2M at the end of 2025, €732 per resident; the median of compared French communes was €748.
Which intercommunality is Groslay part of?
Groslay is part of the Communauté d'agglomération Plaine Vallée, which runs the services its communes share.
Sources: Interior ministry RNE, August 11, 2026 · Interior ministry, municipal results 2026 · OFGL consolidated commune accounts 2018–2025 · INSEE COG 2026 and BANATIC (January 2025) for the intercommunality. 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.