In Vendée · INSEE, populations légales
La Roche-sur-Yon is the most densely populated city in Vendée, at 623 inhab./km², ahead of Les Sables-d'Olonne (578 inhab./km²) and Fontenay-le-Comte (411 inhab./km²). At the other end, Aizenay is the least densely populated city, at 126 inhab./km².
| Rank | City | Density | Population |
|---|---|---|---|
| 1 | La Roche-sur-Yon | 623 inhab./km² | 54,849 |
| 2 | Les Sables-d'Olonne | 578 inhab./km² | 49,603 |
| 3 | Fontenay-le-Comte | 411 inhab./km² | 14,059 |
| 4 | Challans | 351 inhab./km² | 22,943 |
| 5 | Saint-Hilaire-de-Riez | 268 inhab./km² | 13,074 |
| 6 | L'Île-d'Yeu | 204 inhab./km² | 4,883 |
| 7 | Les Herbiers | 185 inhab./km² | 16,521 |
| 8 | Montaigu-Vendée | 179 inhab./km² | 21,134 |
| 9 | Aizenay | 126 inhab./km² | 10,365 |
The same ranking for the whole of France : The densest cities in France · The least densely populated cities in France
Scope: France, metropolitan and overseas, Corsica and the DROM included. This dataset holds every commune of 10,000 inhabitants or more, plus smaller communes famous enough to be household names, 1,131 in all. It is not the full list of 35,000 French communes, so a village can sit outside a ranking whose extreme it would otherwise hold.
Method and sources: populations are the INSEE legal populations, boundaries and coordinates come from the IGN commune registry, both served by geo.api.gouv.fr. Density is the population divided by the commune's area; distances are measured as the crow flies from the commune's centre. Data read on August 28, 2026.