In 1800, the arrondissements of Rouen, Dieppe, Le Havre, Neufchâtel and Yvetot were established. The arrondissements of Neufchâtel and Yvetot were disbanded in 1926.[4]
The borders of the arrondissements of Seine-Maritime were modified in January 2017:[5]
four communes from the arrondissement of Dieppe to the arrondissement of Rouen
12 communes from the arrondissement of Le Havre to the arrondissement of Dieppe
seven communes from the arrondissement of Le Havre to the arrondissement of Rouen
four communes from the arrondissement of Rouen to the arrondissement of Dieppe