The 3 arrondissements of the Sarthe department are:[1] In 1800 the arrondissements of Le Mans, La Flèche, Mamers and Saint-Calais were established.
The arrondissement of Saint-Calais was disbanded in 1926.
[2] In February 2006 the arrondissement of Le Mans lost the five cantons of La Chartre-sur-le-Loir, Château-du-Loir, Le Grand-Lucé, Loué and La Suze-sur-Sarthe to the arrondissement of La Flèche, and the six cantons of Bouloire, Conlie, Montfort-le-Gesnois, Saint-Calais, Sillé-le-Guillaume and Vibraye to the arrondissement of Mamers.
[2][3] In August 2012 the commune Champagné passed from the arrondissement of Mamers to the arrondissement of Le Mans, and the communes Beaufay, Courcemont and Savigné-l'Évêque passed from the arrondissement of Le Mans to the arrondissement of Mamers.
[4]