The 3 arrondissements of the Loire-Atlantique department are:[1]
- Arrondissement of Châteaubriant-Ancenis, (subprefecture: Châteaubriant) with 76 communes. The population of the arrondissement was 231,576 in 2021.
- Arrondissement of Nantes, (prefecture of the Loire-Atlantique department: Nantes) with 76 communes. The population of the arrondissement was 881,045 in 2021.
- Arrondissement of Saint-Nazaire, (subprefecture: Saint-Nazaire) with 55 communes. The population of the arrondissement was 345,185 in 2021.