The 7 arrondissements of the Pas-de-Calais department are:[1]
In 1800 the arrondissements of Arras, Béthune, Boulogne, Montreuil and Saint-Omer were established. The arrondissement of Saint-Pol was created in 1801, and disbanded in 1926.[3] In 1962 the arrondissement of Calais was created from part of the arrondissement of Boulogne-sur-Mer, and the arrondissement of Lens from part of the arrondissement of Béthune.[3][4] In January 2007 the arrondissement of Arras lost the canton of Le Parcq to the arrondissement of Montreuil, and the two cantons of Avion and Rouvroy to the arrondissement of Lens.[3]
The borders of the arrondissements of Pas-de-Calais were modified in January 2017:[5]