In Tarn · INSEE, populations légales
Albi is the most densely populated city in Tarn, at 1,141 inhab./km², ahead of Castres (432 inhab./km²) and Gaillac (317 inhab./km²). At the other end, Cordes-sur-Ciel is the least densely populated city, at 104 inhab./km².
| Rank | City | Density | Population |
|---|---|---|---|
| 1 | Albi | 1,141 inhab./km² | 51,290 |
| 2 | Castres | 432 inhab./km² | 42,505 |
| 3 | Gaillac | 317 inhab./km² | 16,162 |
| 4 | Graulhet | 229 inhab./km² | 13,129 |
| 5 | Lavaur | 173 inhab./km² | 10,965 |
| 6 | Mazamet | 138 inhab./km² | 10,085 |
| 7 | Cordes-sur-Ciel | 104 inhab./km² | 879 |
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.