In 1800 the arrondissements of Laval, Château-Gontier and Mayenne were established. The arrondissement of Château-Gontier was disbanded in 1926, and restored in 1942.[4] On 1 January 2019, the commune of
Château-Gontier were disbanded and establish the new commune of
Château-Gontier-sur-Mayenne as a subprefecture for the
Arrondissement of Château-Gontier.
The borders of the arrondissements of Mayenne were modified in March 2016:[5]
14 communes from the arrondissement of Laval to the arrondissement of Château-Gontier
38 communes from the arrondissement of Laval to the arrondissement of Mayenne