Photo: Jérémy Jännick · Public domainIn Billy-Montigny, the council took a second round
Yanis Gaudillat has been mayor of Billy-Montigny since March 27, 2026, elected by the 29 members of the municipal council. At the March 2026 municipal elections, UNE NOUVELLE ENERGIE POUR BILLY-MONTIGNY won 23 of the 29 seats in the second round on March 22, 2026, with 57.9% of the votes. Billy-Montigny is part of the Communauté d'agglomération de Lens - Liévin.
March 2032
Councils are elected for six years; the council elects the mayor.
Register to vote ↗Throughout this page, the median in Pas-de-Calais and the France median are the median of compared communes (those with an overall grade), each figure its own median.
What stands out about Billy-Montigny’s town hall
Decided in a second round
No list won half the votes in the first round, when 3 lists stood. In the second round on March 22, 2026, UNE NOUVELLE ENERGIE POUR BILLY-MONTIGNY came first with 57.9% and took 23 of the 29 seats; the other lists share the remaining 6. Who’s in charge ↓
Less debt per resident than most
Billy-Montigny owed €3.4M at the end of 2025, €427 per resident: lower than in 77% of compared French communes (France median €748). That equals 48% 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.
- UNE NOUVELLE ENERGIE POUR BILLY-MONTIGNY232 community seats
- POUR UN AVENIR COMMUN61 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 Billy-Montigny 3 seats on the council of the Communauté d'agglomération de Lens - Liévin (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: Yanis Gaudillat · 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 27, 2026Yanis Gaudillat
- 2Deputy mayors7 adjoints, elected by the councilLisa Duriez-GuichardGeoffrey BevanCynthia MurtasBenjamin GrischkoMarie-Noëlle De-LoozeLudovic FlamentJérôme Dardenne
- 3Billy-Montigny municipal council29 seats by listUNE NOUVELLE ENERGIE POUR BILLY-MONTIGNY 23 · POUR UN AVENIR COMMUN 6
- 4Communauté d'agglomération de Lens - LiévinBilly-Montigny 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 Billy-Montigny municipal council
The mayor and 7 deputy mayors first, then the councilors.
| Name | Office | Since |
|---|---|---|
| Yanis Gaudillat | Maire | March 27, 2026 |
| Lisa Duriez-Guichard | 1er adjoint au Maire | March 27, 2026 |
| Geoffrey Bevan | 2ème adjoint au Maire | March 27, 2026 |
| Cynthia Murtas | 3ème adjoint au Maire | March 27, 2026 |
| Benjamin Grischko | 4ème adjoint au Maire | March 27, 2026 |
| Marie-Noëlle De-Looze | 5ème adjoint au Maire | March 27, 2026 |
| Ludovic Flament | 6ème adjoint au Maire | March 27, 2026 |
| Jérôme Dardenne | 7ème adjoint au Maire | March 27, 2026 |
Show the full council (29)
| Name | Office | Since |
|---|---|---|
| Yanis Gaudillat | Maire | March 27, 2026 |
| Lisa Duriez-Guichard | 1er adjoint au Maire | March 27, 2026 |
| Geoffrey Bevan | 2ème adjoint au Maire | March 27, 2026 |
| Cynthia Murtas | 3ème adjoint au Maire | March 27, 2026 |
| Benjamin Grischko | 4ème adjoint au Maire | March 27, 2026 |
| Marie-Noëlle De-Looze | 5ème adjoint au Maire | March 27, 2026 |
| Ludovic Flament | 6ème adjoint au Maire | March 27, 2026 |
| Jérôme Dardenne | 7ème adjoint au Maire | March 27, 2026 |
| Fadila Briki | Conseiller municipal | March 22, 2026 |
| Séverine Brunelles | Conseiller municipal | March 22, 2026 |
| Joël Cailluyere | Conseiller municipal | March 22, 2026 |
| Jean-Michel Caudrelier | Conseiller municipal | March 22, 2026 |
| Michel Desplanques | Conseiller municipal | March 22, 2026 |
| Frédéric Dubois | Conseiller municipal | March 22, 2026 |
| Marc Eeckman | Conseiller municipal | March 22, 2026 |
| Martine Famil | Conseiller municipal | March 22, 2026 |
| Brendy Flament | Conseiller municipal | March 22, 2026 |
| Angélique Fournier | Conseiller municipal | March 22, 2026 |
| David Fournier | Conseiller municipal | March 22, 2026 |
| Virgine Loy | Conseiller municipal | March 22, 2026 |
| Nathalie Manier-Megueulle | Conseiller municipal | March 22, 2026 |
| Christophe Marechal | Conseiller municipal | March 22, 2026 |
| Alexandre Millien | Conseiller municipal | March 22, 2026 |
| Aurore Mopty | Conseiller municipal | March 22, 2026 |
| Séverine Olivier | Conseiller municipal | March 22, 2026 |
| Sabine Rudolph | Conseiller municipal | March 22, 2026 |
| Corentin Stachowiak | Conseiller municipal | March 22, 2026 |
| Bruno Troni | Conseiller municipal | March 22, 2026 |
| Magdalena Zimolag | 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 Billy-Montigny, above.
How Billy-Montigny voted in March 2026
3 lists stood in the first round; none won half the votes, so a second round followed.
3,410 votes cast for a list
3,509 of 5,297 registered voters in Billy-Montigny voted.
51 blank and 48 spoilt ballots, not counted in the shares.
3,136 votes cast for a list · no seats given out: a second round followed
3,191 of 5,295 registered voters in Billy-Montigny voted.
38 blank and 17 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.
Billy-Montigny spends €1,171 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
Billy-Montigny owed €3.4M at the end of 2025, €427 per resident, lower than in 77% of compared French communes, equal to 48% of a year’s running costs.
Show year by year
| Year | Spending | Investment | Debt | Debt in all |
|---|---|---|---|---|
| 2025 | €1,171 | €279 | €427 | €3.4M |
| 2024 | €2,386 | €1,165 | €514 | €4.2M |
| 2023 | €1,638 | €816 | €594 | €4.9M |
| 2022 | €1,149 | €393 | €677 | €5.6M |
| 2021 | €1,126 | €421 | €497 | €4.1M |
| 2020 | €1,073 | €353 | €554 | €4.5M |
| 2019 | €1,258 | €533 | €606 | €5M |
| 2018 | €1,112 | €412 | €655 | €5.4M |
Source: OFGL, consolidated commune accounts 2018–2025 (DGFiP); 2025 provisional.
The 9th 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: La Ricamarie, €114. Highest: Publier, €3,162.
Have a say in Billy-Montigny
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 Billy-Montigny 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 Billy-Montigny’s town hall
Who is the mayor of Billy-Montigny?
Yanis Gaudillat, mayor since March 27, 2026, according to the Interior ministry’s register of elected officials (August 11, 2026).
How many councilors does Billy-Montigny have?
The Billy-Montigny municipal council has 29 members, the mayor and 7 deputy mayors included.
Who won the 2026 municipal elections in Billy-Montigny?
UNE NOUVELLE ENERGIE POUR BILLY-MONTIGNY, in the second round on March 22, 2026, with 57.9% of the votes; it holds 23 of the 29 seats.
What was the turnout in Billy-Montigny?
60.3% 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 Billy-Montigny?
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 Billy-Montigny have?
€3.4M at the end of 2025, €427 per resident; the median of compared French communes was €748.
Which intercommunality is Billy-Montigny part of?
Billy-Montigny is part of the Communauté d'agglomération de Lens - Liévin, 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.