In Aisne · INSEE, populations légales
Saint-Quentin is the most densely populated city in Aisne, at 2,316 inhab./km², ahead of Soissons (2,276 inhab./km²) and Château-Thierry (889 inhab./km²). At the other end, Villers-Cotterêts is the least densely populated city, at 249 inhab./km².
| Rank | City | Density | Population |
|---|---|---|---|
| 1 | Saint-Quentin | 2,316 inhab./km² | 52,813 |
| 2 | Soissons | 2,276 inhab./km² | 28,046 |
| 3 | Château-Thierry | 889 inhab./km² | 15,097 |
| 4 | Chauny | 871 inhab./km² | 11,596 |
| 5 | Tergnier | 713 inhab./km² | 13,045 |
| 6 | Laon | 545 inhab./km² | 24,220 |
| 7 | Villers-Cotterêts | 249 inhab./km² | 10,489 |
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.