In Groix, turnout beat 99% of compared French communes
Erwan Tonnerre has been mayor of Groix since March 21, 2026, elected by the 19 members of the municipal council. At the March 2026 municipal elections, Groix au coeur won 15 of the 19 seats in the first round on March 15, 2026, with 53.7% of the votes. Groix is part of the Communauté d'agglomération Lorient Agglomération.
March 2032
Councils are elected for six years; the council elects the mayor.
Register to vote ↗Throughout this page, the median in Morbihan and the France median are the median of compared communes (those with an overall grade), each figure its own median. Groix has 2,310 residents; every compared commune has 2,507 or more, so read its place among them with that in mind.
What stands out about Groix’s town hall
Won in the first round
Groix au coeur won 53.7% of the votes on March 15, 2026, more than half, so there was no second round; 3 lists stood. It took 15 of the 19 seats: half the seats as the list ahead, and its share of the rest. The other lists share the remaining 4. Who’s in charge ↓
Turnout above most communes
80.4% of registered voters in Groix voted on March 15, 2026: higher than in 99% of compared French communes. The median of compared communes in Morbihan was 62.8%; across France, 57.4%. 2026 elections ↓
More debt per resident than most
Groix owed €4.1M at the end of 2025, €1,725 per resident: higher than in 92% of compared French communes (France median €748). That equals 115% of a year’s running costs. The commune’s money ↓
A big year for investment
Groix invested €995 per resident (buildings, roads, equipment), 40% of its spending: higher than in 93% of compared French communes (France median €403). Investment swings from year to year with projects. 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.
- Groix au coeur151 community seat
- Groix agir ensemble30 community seats
- GROIX 2026 - NOUVEAU CAP10 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 Groix 1 seat on the council of the Communauté d'agglomération Lorient Agglomération (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: Erwan Tonnerre · 19 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 21, 2026Erwan Tonnerre
- 2Deputy mayors5 adjoints, elected by the councilAlain DelmoulyNathalie GouroncYannick AuffrayStéphanie GourroncChristophe Cantin
- 3Groix municipal council19 seats by listGroix au coeur 15 · Groix agir ensemble 3 · GROIX 2026 - NOUVEAU CAP 1
- 4Communauté d'agglomération Lorient AgglomérationGroix 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 19 members of the Groix municipal council
The mayor and 5 deputy mayors first, then the councilors.
| Name | Office | Since |
|---|---|---|
| Erwan Tonnerre | Maire | March 21, 2026 |
| Alain Delmouly | 1er adjoint au Maire | March 21, 2026 |
| Nathalie Gouronc | 2ème adjoint au Maire | March 21, 2026 |
| Yannick Auffray | 3ème adjoint au Maire | March 21, 2026 |
| Stéphanie Gourronc | 4ème adjoint au Maire | March 21, 2026 |
| Christophe Cantin | 5ème adjoint au Maire | March 21, 2026 |
Show the full council (19)
| Name | Office | Since |
|---|---|---|
| Erwan Tonnerre | Maire | March 21, 2026 |
| Alain Delmouly | 1er adjoint au Maire | March 21, 2026 |
| Nathalie Gouronc | 2ème adjoint au Maire | March 21, 2026 |
| Yannick Auffray | 3ème adjoint au Maire | March 21, 2026 |
| Stéphanie Gourronc | 4ème adjoint au Maire | March 21, 2026 |
| Christophe Cantin | 5ème adjoint au Maire | March 21, 2026 |
| Nicolas Burlion | Conseiller municipal | March 15, 2026 |
| Marina Callonnec | Conseiller municipal | March 15, 2026 |
| Victor Da Silva | Conseiller municipal | March 15, 2026 |
| Françoise Gueran | Conseiller municipal | March 15, 2026 |
| Corinne Le Bouhellec | Conseiller municipal | March 15, 2026 |
| Gwendalyne Le Douaran | Conseiller municipal | March 15, 2026 |
| Eric Le Dref | Conseiller municipal | March 15, 2026 |
| Marine Le Goff | Conseiller municipal | March 15, 2026 |
| Soazig Le Moullac | Conseiller municipal | March 15, 2026 |
| François Marguet | Conseiller municipal | March 15, 2026 |
| Camille Maugée | Conseiller municipal | March 15, 2026 |
| Laurent Sartre | Conseiller municipal | March 15, 2026 |
| José-Luis Teixeira | 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 Groix, above.
How Groix voted in March 2026
3 lists stood; one won more than half the votes in the first round.
1,862 votes cast for a list
1,893 of 2,355 registered voters in Groix voted.
18 blank and 13 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.
Groix spends €2,493 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
Groix owed €4.1M at the end of 2025, €1,725 per resident, higher than in 92% of compared French communes, equal to 115% of a year’s running costs.
Show year by year
| Year | Spending | Investment | Debt | Debt in all |
|---|---|---|---|---|
| 2025 | €2,493 | €995 | €1,725 | €4.1M |
| 2024 | €2,179 | €749 | €1,905 | €4.4M |
| 2023 | €2,799 | €1,427 | €2,093 | €4.8M |
| 2022 | €2,876 | €1,566 | €2,275 | €5.2M |
| 2021 | €2,157 | €942 | €2,429 | €5.6M |
| 2020 | €1,832 | €751 | €2,574 | €6M |
| 2019 | €2,875 | €1,629 | €2,717 | €6.3M |
| 2018 | €3,442 | €2,223 | €2,616 | €6.1M |
Source: OFGL, consolidated commune accounts 2018–2025 (DGFiP); 2025 provisional.
The 5th highest debt per resident of 41 communes its size
The 40 compared communes nearest in population, debt per resident at the end of 2025.
Lowest: Watten, €1. Highest: Mers-les-Bains, €3,228.
Have a say in Groix
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 Groix 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 Groix’s town hall
Who is the mayor of Groix?
Erwan Tonnerre, mayor since March 21, 2026, according to the Interior ministry’s register of elected officials (August 11, 2026).
How many councilors does Groix have?
The Groix municipal council has 19 members, the mayor and 5 deputy mayors included.
Who won the 2026 municipal elections in Groix?
Groix au coeur, in the first round on March 15, 2026, with 53.7% of the votes; it holds 15 of the 19 seats.
What was the turnout in Groix?
80.4% 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 Groix?
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 Groix have?
€4.1M at the end of 2025, €1,725 per resident; the median of compared French communes was €748.
Which intercommunality is Groix part of?
Groix is part of the Communauté d'agglomération Lorient Agglomération, 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.