The four arrondissements of the Côtes-d'Armor department are:
Arrondissement of Dinan, (subprefecture: Dinan) with 67 communes. The population of the arrondissement was 105,848 in 2021. Arrondissement of Guingamp, (subprefecture: Guingamp) with 111 communes. The population of the arrondissement was 125,699 in 2021. Arrondissement of Lannion, (subprefecture: Lannion) with 57 communes. The population of the arrondissement was 100,259 in 2021. Arrondissement of Saint-Brieuc, (prefecture of the Côtes-d'Armor department: Saint-Brieuc) with 113 communes. The population of the arrondissement was 274,111 in 2021.
History
In 1800, the arrondissements of Saint-Brieuc, Dinan, Guingamp, Lannion and Loudéac were established. The arrondissement of Loudéac was disbanded in 1926.Historique des Côtes-d'Armor
The borders of the arrondissements of Côtes-d'Armor were modified in January 2017: 25 communes from the arrondissement of Dinan to the arrondissement of Saint-Brieuc five communes from the arrondissement of Guingamp to the arrondissement of Saint-Brieuc 29 communes from the arrondissement of Saint-Brieuc to the arrondissement of Guingamp
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