Photo: Lionel Allorge · CC BY-SA 3.0Soisy-sur-Seine carries less debt per resident than 99% of compared communes
Elisabeth Petitdidier has been mayor of Soisy-sur-Seine since March 20, 2026, elected by the 29 members of the municipal council. At the March 2026 municipal elections, ENSEMBLE POUR SOISY won 24 of the 29 seats in the first round on March 15, 2026, with 58.6% of the votes. Soisy-sur-Seine is part of the Communauté d'agglomération Grand Paris Sud Seine Essonne Sénart.
March 2032
Councils are elected for six years; the council elects the mayor.
Register to vote ↗Throughout this page, the median in Essonne and the France median are the median of compared communes (those with an overall grade), each figure its own median.
What stands out about Soisy-sur-Seine’s town hall
Won in the first round
ENSEMBLE POUR SOISY won 58.6% of the votes on March 15, 2026, more than half, so there was no second round; 3 lists stood. It took 24 of the 29 seats: half the seats as the list ahead, and its share of the rest. The other lists share the remaining 5. Who’s in charge ↓
Less debt per resident than most
Soisy-sur-Seine owed €15K at the end of 2025, €2 per resident: lower than in 99% of compared French communes (France median €748). That equals 0% of a year’s running costs. The commune’s money ↓
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.
- ENSEMBLE POUR SOISY241 community seat
- L'envol pour Soisy30 community seats
- SOISY DEMAIN20 community seats
As elected in the first round, March 15, 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 Soisy-sur-Seine 1 seat on the council of the Communauté d'agglomération Grand Paris Sud Seine Essonne Sénart (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: Elisabeth Petitdidier · 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 20, 2026Elisabeth Petitdidier
- 2Deputy mayors8 adjoints, elected by the councilStéphane DerletFabienne FauriantFrançois FranchiAurélie Dumontaud SeureRené-Paul RégentCarole HeintzOlivier MoulinClaire Piry-Ruiz
- 3Soisy-sur-Seine municipal council29 seats by listENSEMBLE POUR SOISY 24 · L'envol pour Soisy 3 · SOISY DEMAIN 2
- 4Communauté d'agglomération Grand Paris Sud Seine Essonne SénartSoisy-sur-Seine holds 1 seatCommunity 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 Soisy-sur-Seine municipal council
The mayor and 8 deputy mayors first, then the councilors.
| Name | Office | Since |
|---|---|---|
| Elisabeth Petitdidier | Maire | March 20, 2026 |
| Stéphane Derlet | 1er adjoint au Maire | March 20, 2026 |
| Fabienne Fauriant | 2ème adjoint au Maire | March 20, 2026 |
| François Franchi | 3ème adjoint au Maire | March 20, 2026 |
| Aurélie Dumontaud Seure | 4ème adjoint au Maire | March 20, 2026 |
| René-Paul Régent | 5ème adjoint au Maire | March 20, 2026 |
| Carole Heintz | 6ème adjoint au Maire | March 20, 2026 |
| Olivier Moulin | 7ème adjoint au Maire | March 20, 2026 |
| Claire Piry-Ruiz | 8ème adjoint au Maire | March 20, 2026 |
Show the full council (29)
| Name | Office | Since |
|---|---|---|
| Elisabeth Petitdidier | Maire | March 20, 2026 |
| Stéphane Derlet | 1er adjoint au Maire | March 20, 2026 |
| Fabienne Fauriant | 2ème adjoint au Maire | March 20, 2026 |
| François Franchi | 3ème adjoint au Maire | March 20, 2026 |
| Aurélie Dumontaud Seure | 4ème adjoint au Maire | March 20, 2026 |
| René-Paul Régent | 5ème adjoint au Maire | March 20, 2026 |
| Carole Heintz | 6ème adjoint au Maire | March 20, 2026 |
| Olivier Moulin | 7ème adjoint au Maire | March 20, 2026 |
| Claire Piry-Ruiz | 8ème adjoint au Maire | March 20, 2026 |
| Anne-Françoise Bachelet | Conseiller municipal | March 15, 2026 |
| Sylvie Benech | Conseiller municipal | March 15, 2026 |
| Ludivine Boucher | Conseiller municipal | March 15, 2026 |
| Leslie Causeret | Conseiller municipal | March 15, 2026 |
| Virginie Cousin | Conseiller municipal | March 15, 2026 |
| Cyrille Dehlinger | Conseiller municipal | March 15, 2026 |
| Paul Ella Nlem | Conseiller municipal | March 15, 2026 |
| Julien Ferté | Conseiller municipal | March 15, 2026 |
| Marco Galeotta | Conseiller municipal | March 15, 2026 |
| Cyril Gambin | Conseiller municipal | March 15, 2026 |
| Mohamed Ismail | Conseiller municipal | March 15, 2026 |
| Jean-Luc Labourdette | Conseiller municipal | March 15, 2026 |
| Régine Le Grill | Conseiller municipal | March 15, 2026 |
| Jeanne Mbaga | Conseiller municipal | March 15, 2026 |
| Ophélie Micoud | Conseiller municipal | March 15, 2026 |
| Cécile Moulin | Conseiller municipal | March 15, 2026 |
| Martin Pré | Conseiller municipal | March 15, 2026 |
| Frédéric Quevillon | Conseiller municipal | March 15, 2026 |
| Laurent Schreiber | Conseiller municipal | March 15, 2026 |
| Jean Serrat | Conseiller municipal | March 15, 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 Soisy-sur-Seine, above.
How Soisy-sur-Seine voted in March 2026
3 lists stood; one won more than half the votes in the first round.
3,089 votes cast for a list
3,134 of 5,223 registered voters in Soisy-sur-Seine voted.
35 blank and 10 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.
Soisy-sur-Seine spends €1,498 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
Soisy-sur-Seine owed €15K at the end of 2025, €2 per resident, lower than in 99% of compared French communes, equal to 0% of a year’s running costs.
Show year by year
| Year | Spending | Investment | Debt | Debt in all |
|---|---|---|---|---|
| 2025 | €1,498 | €432 | €2 | €15K |
| 2024 | €1,338 | €236 | €2 | €12K |
| 2023 | €1,250 | €199 | €72 | €533K |
| 2022 | €1,176 | €171 | €72 | €533K |
| 2021 | €1,246 | €284 | €72 | €533K |
| 2020 | €1,153 | €230 | €81 | €594K |
| 2019 | €1,551 | €627 | €91 | €656K |
| 2018 | €1,651 | €688 | €100 | €712K |
Source: OFGL, consolidated commune accounts 2018–2025 (DGFiP); 2025 provisional.
The 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: Soisy-sur-Seine, €2. Highest: Pontcharra, €1,890.
Have a say in Soisy-sur-Seine
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 Soisy-sur-Seine 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 Soisy-sur-Seine’s town hall
Who is the mayor of Soisy-sur-Seine?
Elisabeth Petitdidier, mayor since March 20, 2026, according to the Interior ministry’s register of elected officials (August 11, 2026).
How many councilors does Soisy-sur-Seine have?
The Soisy-sur-Seine municipal council has 29 members, the mayor and 8 deputy mayors included.
Who won the 2026 municipal elections in Soisy-sur-Seine?
ENSEMBLE POUR SOISY, in the first round on March 15, 2026, with 58.6% of the votes; it holds 24 of the 29 seats.
What was the turnout in Soisy-sur-Seine?
60% 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 Soisy-sur-Seine?
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 Soisy-sur-Seine have?
€15K at the end of 2025, €2 per resident; the median of compared French communes was €748.
Which intercommunality is Soisy-sur-Seine part of?
Soisy-sur-Seine is part of the Communauté d'agglomération Grand Paris Sud Seine Essonne Sénart, 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.