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Rosny-sur-Seine: ROSNY AVENIR won the town hall in 2026; Marine Le Pen would lead here in 2027

Rosny-sur-Seine (Yvelines, INSEE 78531) has 4,107 registered voters. Its council has 29 seats; the 2026 municipal election was settled in the first round on 15 March. The next municipal elections are in 2032; the presidential election is on 18 April 2027.

The municipal election, March 2026

Round one, 15 March · 2,318 voted, 2,252 valid votes

  1. ROSNY AVENIRMiscellaneous right 53.9% · 1,213 · 23 seats
  2. AGIR POUR ROSNYMiscellaneous centre 25.7% · 579 · 3 seats
  3. Rosny en communMiscellaneous left 20.4% · 460 · 3 seats

Official results, Ministère de l'Intérieur. Lists are labelled with the ministry's political "nuance"; lists in small communes carry none. The list that comes first takes half the seats as a bonus, and the rest are shared in proportion among lists over 5%.

The 2027 presidential election here, round one

Our national forecast for round one, carried down to Rosny-sur-Seine from how it voted in 2022.

  1. Marine Le PenNational Rally 34.0% · France 34.2%
  2. Jean-Luc MélenchonFrance Unbowed 27.6% · France 16.8%
  3. Raphaël GlucksmannSocialists 11.0% · France 13.4%
  4. Édouard PhilippeEnsemble (Macron camp) 10.9% · France 14.3%
  5. Bruno RetailleauRepublicans 6.9% · France 7.6%
  6. Éric ZemmourReconquête 2.8% · France 3.8%
  7. Nicolas Dupont-AignanSovereigntists 2.5% · France 2.1%
  8. Marine TondelierGreens 2.0% · France 2.9%
  9. Fabien RousselCommunist Party 1.8% · France 2.0%

In 2022, round one here: France Unbowed 35.7% · National Rally 22.3% · Ensemble (Macron camp) 21.3% · Reconquête 5.4% · Republicans 4.1%. Each political family moves by its national change since 2022 (half uniform, half proportional), scaled so that every commune adds up to our national forecast. The national forecast →

Communes of a similar size in Yvelines

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