The population of El Pallars goes back to prehistory, a period from which we have a variety of witnesses as many megalithic monuments have been discovered.
The Roman Presence was thought not to be particularly intense, in opposition to that in La Vall d'Aran, although the most recent archaeological findings are starting to demonstrate that is was not so.
Already in the Medieval Times and while the Roman Empire was starting to recede, the communities living in the mountains began to exploit the natural resources that these provided.
In the times of Muslim Invasions, the territory was only submitted to give them tributes or territorial taxes.
After the conquer and under the domination of the Counts of Tolosa, the noble house of the Counts of El Pallars started, which would become the longest one in all of the Catalan counties and that would end around 1487 when the Castle of València d'Àneu was invaded and it put an end to the rule of Hug Roger III.
The general crisis of the feudal system continues to the Modern Times and in the transformation of the County of Pallars into a marquisate in the hands of the House of Cardona. The marquisate coexisted with several regional nobles, but all of them belonged to a higher and superior structure, a royal one, which became a sotsvegueria of El Pallars and that, in the 18th century, would become the corregiment of Talarn.
From the end of the 18th century to 1870, the population grows to reach the top of its demographic development, 20.348 inhabitants in the year 1860.
From 1870 to 1910, there is a crisis in the economics of sustenance prevailing to that moment and a economic and demographic decline stats, triggered by the desamortització civil of Madoz, also by bad climate and the spread of the filoxera, among other factors.
From 1910 to 1960, and due to the implantation of the hydro electrical industries, a modernising process of the traditional society begins, shattered by the Civil War and its aftermath.
From 1960 to 1980 the county undergoes a second crisis brought about by the mechanization of the farming process and the industrialization of cities, which will make the county of El Pallars suffer another demographic drop, almost to the point of leaving the region with less than half of the population (5.247 habitants).