Le Mesnil-Saint-Firmin village until the 17th century was the stronghold of the house Estourmel, then in the 18th century the Marquis of Dieudonne Hautefort. At these times, it included an imposing castle, destroyed in May 1756 following an earthquake. Only a few old stones are still visible on the basement of a barn near the castle today.
The town flourished during the 19th century and early twentieth. In 1936, there were another 320 people to 120 today.
The dynamism in the locality was made by the mayor at the time, Gabriel Boniface Bazin (from 1820 to 1862) who managed to be a pioneer in the industrialization of agriculture and a recognition of his humanist contemporaries (it is done Chevalier de la Legion d'Honneur in 1854).
