Castelnau-de-Mandailles invested more per resident in 2025 than 99% of compared communes
Sandra Sielvy has been mayor of Castelnau-de-Mandailles since March 20, 2026, elected by the 15 members of the municipal council. A single list stood in March 2026, UNIS POUR NOS VILLAGES, and took all 15 seats. Castelnau-de-Mandailles is part of the Communauté de communes des Causses à l'Aubrac.
March 2032
Councils are elected for six years; the council elects the mayor.
Register to vote ↗Throughout this page, the median in Aveyron and the France median are the median of compared communes (those with an overall grade), each figure its own median. Castelnau-de-Mandailles has 565 residents; every compared commune has 2,507 or more, so read its place among them with that in mind.
What stands out about Castelnau-de-Mandailles’s town hall
A single list
Only one list stood in Castelnau-de-Mandailles on March 15, 2026: UNIS POUR NOS VILLAGES. It took all 15 seats; with no rival list, voters could only vote for it, cast a blank ballot or stay at home. 2026 elections ↓
Turnout above most communes
66.8% of registered voters in Castelnau-de-Mandailles voted on March 15, 2026: higher than in 90% of compared French communes. The median of compared communes in Aveyron was 62.5%; across France, 57.4%. 2026 elections ↓
More debt per resident than most
Castelnau-de-Mandailles owed €1.1M at the end of 2025, €1,877 per resident: higher than in 94% of compared French communes (France median €748). That equals 179% of a year’s running costs. The commune’s money ↓
A big year for investment
Castelnau-de-Mandailles invested €1,648 per resident (buildings, roads, equipment), 61% of its spending: higher than in 99% 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.
- UNIS POUR NOS VILLAGES15
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.
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: Sandra Sielvy · 15 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, 2026Sandra Sielvy
- 2Deputy mayors3 adjoints, elected by the councilChristian SensebyCatherine GardesHervé Mercui
- 3Castelnau-de-Mandailles municipal council15 seats by listUNIS POUR NOS VILLAGES 15
Source: Interior ministry, national register of elected officials (RNE), August 11, 2026.
The 15 members of the Castelnau-de-Mandailles municipal council
The mayor and 3 deputy mayors first, then the councilors.
| Name | Office | Since |
|---|---|---|
| Sandra Sielvy | Maire | March 20, 2026 |
| Christian Senseby | 1er adjoint au Maire | March 20, 2026 |
| Catherine Gardes | 2ème adjoint au Maire | March 20, 2026 |
| Hervé Mercui | 3ème adjoint au Maire | March 20, 2026 |
Show the full council (15)
| Name | Office | Since |
|---|---|---|
| Sandra Sielvy | Maire | March 20, 2026 |
| Christian Senseby | 1er adjoint au Maire | March 20, 2026 |
| Catherine Gardes | 2ème adjoint au Maire | March 20, 2026 |
| Hervé Mercui | 3ème adjoint au Maire | March 20, 2026 |
| Mathieu Anglade | Conseiller municipal | March 15, 2026 |
| Isabelle Bernard | Conseiller municipal | March 15, 2026 |
| Christiane Carriere | Conseiller municipal | March 15, 2026 |
| Vincent Colin | Conseiller municipal | March 15, 2026 |
| Marine Costes | Conseiller municipal | March 15, 2026 |
| Jean-Claude Delmas | Conseiller municipal | March 15, 2026 |
| Virginie Granier | Conseiller municipal | March 15, 2026 |
| Carine Guerini | Conseiller municipal | March 15, 2026 |
| Benjamin Guilloth | Conseiller municipal | March 15, 2026 |
| Noël Nicolas | Conseiller municipal | March 15, 2026 |
| Lydia Privat | 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 Castelnau-de-Mandailles, above.
How Castelnau-de-Mandailles voted in March 2026
A single list stood.
271 votes cast for a list
326 of 488 registered voters in Castelnau-de-Mandailles voted.
17 blank and 38 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.
Castelnau-de-Mandailles spends €2,699 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
Castelnau-de-Mandailles owed €1.1M at the end of 2025, €1,877 per resident, higher than in 94% of compared French communes, equal to 179% of a year’s running costs.
Show year by year
| Year | Spending | Investment | Debt | Debt in all |
|---|---|---|---|---|
| 2025 | €2,699 | €1,648 | €1,877 | €1.1M |
| 2024 | €1,867 | €943 | €1,402 | €809K |
| 2023 | €1,209 | €250 | €841 | €489K |
| 2022 | €1,259 | €344 | €925 | €542K |
| 2021 | €1,576 | €622 | €918 | €544K |
| 2020 | €1,140 | €348 | €995 | €594K |
| 2019 | €947 | €88 | €1,089 | €643K |
| 2018 | €950 | €121 | €1,199 | €700K |
Source: OFGL, consolidated commune accounts 2018–2025 (DGFiP); 2025 provisional.
The 4th 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 Castelnau-de-Mandailles
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 Castelnau-de-Mandailles 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 Castelnau-de-Mandailles’s town hall
Who is the mayor of Castelnau-de-Mandailles?
Sandra Sielvy, mayor since March 20, 2026, according to the Interior ministry’s register of elected officials (August 11, 2026).
How many councilors does Castelnau-de-Mandailles have?
The Castelnau-de-Mandailles municipal council has 15 members, the mayor and 3 deputy mayors included.
Who won the 2026 municipal elections in Castelnau-de-Mandailles?
Only one list stood: UNIS POUR NOS VILLAGES, which took all 15 seats.
What was the turnout in Castelnau-de-Mandailles?
66.8% 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 Castelnau-de-Mandailles?
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 Castelnau-de-Mandailles have?
€1.1M at the end of 2025, €1,877 per resident; the median of compared French communes was €748.
Which intercommunality is Castelnau-de-Mandailles part of?
Castelnau-de-Mandailles is part of the Communauté de communes des Causses à l'Aubrac, 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.