In Ain · INSEE, populations légales
Ferney-Voltaire is the most densely populated city in Ain, at 2,527 inhab./km², ahead of Bourg-en-Bresse (1,763 inhab./km²) and Saint-Genis-Pouilly (1,471 inhab./km²). At the other end, Pérouges is the least densely populated city, at 72 inhab./km².
| Rank | City | Density | Population |
|---|---|---|---|
| 1 | Ferney-Voltaire | 2,527 inhab./km² | 12,094 |
| 2 | Bourg-en-Bresse | 1,763 inhab./km² | 42,372 |
| 3 | Saint-Genis-Pouilly | 1,471 inhab./km² | 14,432 |
| 4 | Ambérieu-en-Bugey | 649 inhab./km² | 15,934 |
| 5 | Oyonnax | 622 inhab./km² | 22,480 |
| 6 | Gex | 427 inhab./km² | 13,627 |
| 7 | Miribel | 425 inhab./km² | 10,395 |
| 8 | Divonne-les-Bains | 309 inhab./km² | 10,464 |
| 9 | Valserhône | 266 inhab./km² | 16,712 |
| 10 | Pérouges | 72 inhab./km² | 1,387 |
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.