[4] The sole other department to have a single arrondissement is the Territoire de Belfort, which in 2024 had 101 communes.

In 1800 the arrondissement of Paris was established as part of the Seine department.

In 1962 it absorbed the communes of the former arrondissements of Saint-Denis and Sceaux.

In 1964 and 1966 it lost territory to the new arrondissements of Bobigny, Créteil, Nanterre, Antony and Nogent-sur-Marne.

In 1968 the Seine department was disbanded, and the arrondissement of Paris became the single arrondissement of the Paris department.