# 2020 Rosny-sur-Seine municipal election

[France](https://electionsarchive.com/fr.md) / [Rosny-sur-Seine](https://electionsarchive.com/fr/rosny-sur-seine.md), March 15, 2020

Turnout: 1,837 of 3,938 registered voters (46.6%). −18.6 points since 2014.

## [Municipal council of Rosny-sur-Seine](https://electionsarchive.com/fr/rosny-sur-seine/2020-03-15-local/conseil-municipal.md)

Pierre Yves Dumoulin won 24 of the 29 seats, with 60.3% of the vote.

| Candidate or party | Party | Votes | Share | Seats |
| --- | --- | --- | --- | --- |
| Pierre Yves Dumoulin | LDVD | 1,064 | 60.3% | 24 |
| Francoise Descamps Crosnier | LDVG | 701 | 39.7% | 5 |

## Contests

- [2020 Rosny-sur-Seine municipal election, first round](https://electionsarchive.com/fr/rosny-sur-seine/2020-03-15-local/conseil-municipal.md)

## Party system indices

[How these indices are computed](https://electionsarchive.com/indices.md)

| Chamber | Effective parties by votes | Effective parties by seats | Gallagher index | Loosemore–Hanby index | Volatility | Nationalization |
| --- | --- | --- | --- | --- | --- | --- |
| Municipal council of Rosny-sur-Seine | 1.92 | 1.40 | 22.5 | 22.5 | 100.0 |  |

- From 1,765 votes and 29 seats.
- Compared with [2014 Rosny-sur-Seine municipal election](https://electionsarchive.com/fr/rosny-sur-seine/2014-03-23-local.md).
- A large party has no recorded predecessor or successor, so its whole share counts as change.

Also available as HTML at https://electionsarchive.com/fr/rosny-sur-seine/2020-03-15-local and JSON at https://electionsarchive.com/fr/rosny-sur-seine/2020-03-15-local.json.