The remote origin of what is now Jacarilla can be traced to the fourth century BC, when in this place was located an Iberian settlement. For those distant dates, this area of Vega Baja del Segura presented orographical conditions different from today; Jacarilla was on the edge of a marsh fed alluviums of Vinalopó and Segura and that was spreading to the Mediterranean Sea.
It is reported by some inscriptions found in 1921 in the Serreta of Alcoy that by that time there was a large pilgrimage from different places to a spiritual centre for making offerings to the goddess of fertility. In the sheet of lead found there appears a relation that details the origin of each group of these people, and the last one to appear is Sakariskera, come to mean "place where the river of sand is stopped". The place name will evolve to Xacariella , Hacarilla and finally to Jacarilla.
As in all cases of place names of uncertain origin, also for Jacarilla are defended various etymological theories, but the mention above is the one that goes back to a distant past.
Over time and reconquested the place from the Moors, the family Togores, as include the Llibre del Repartiments of the King James I of Aragon, is going to exercise its undivided domination for centuries. In the seventeenth it becomes independent from Orihuela, and in the nineteenth, being Francisco Sandoval Melgares the owner of the land, gets its separation of Bigastro.
In 1899, after the death of the last lord of Jacarilla the territory was divided equally among his four sons. In 1915, one of the heirs sold his property (about 850 hectares of land was located among which the village was placed) to the Marquis of Fontana, who had been captivated by the natural beauty of the natural place known as the "Vereda de las Palmeras", by a total of about a million pesetas.
In 1947, the inheritor of the Marquis divided into plots and sold proportionally to 240 neighbours of Jacarilla these lands that they were working as sharecroppers, like their ancestors had always done. After paying seven millions and half of pesetas disappeared in the middle of the 20th century this vestige of dependence almost feudal of medieval roots.