Mirabel is a fortified hilltop village, dating from the Middle Age, owned by the bishop of Die and dominant of the river Drôme, facing the "3 Becs", iconic Drôme summits.
Mirabel is mentioned for the 1st time in 1165 in the cartulary of the Bishop of Die (inventory of his possessions), under the name "castrum de Mirabel". Mirabel was fortified during the Episcopal War between the Count of Valentinois and the Bishop of Die. The castrum was dismantled in 1586.
In the 17th century, an area near the Gervanne River appeared to be uninhabited, with the exception of the bishop's former mill. Armand de Forest de Mirabel de Blacons, a descendant of the daughter of the last lord of Mirabel, gave his name to the small area he owned. Blacons-sur-Drôme was born.
The name Mirabel-et-Blacons only dates back to 1805.
Industrialization arrived in the 19th century with the creation of a paper mill in Blacons by the Lombard-Latune family in 1818, to rival that of Canson & Montgolfier. The mill closed in 1972.
In the early 20th century, the town hall was transferred from Mirabel to Blacons. Gradually, the villagers left Mirabel.
In Blacons, the former paper mill buildings have been renovated by the commune. They now house the town hall, the multi-purpose hall, associations and housing.