The 3 arrondissements of the Allier department are:[1][2] In 1800 the arrondissements of Moulins, Gannat, Lapalisse and Montluçon were established.
The arrondissement of Gannat was disbanded in 1926.
In 1941 Vichy replaced Lapalisse as subprefecture.
[3] The borders of the arrondissements of Allier were modified in January 2017:[4] The borders of the arrondissements of Allier were modified again in January 2024:[1]