It was founded in 1965 by the fusion of the municipalities of Ezkio and Itsaso. In December 2016 the Regional Council of Gipuzkoa tried to split Ezkio-Itsaso into two independent municipalities. However, this was refused by the Spanish central government and finally dismissed by court decisions (judgments of 09/07/2018 and 09/20/2019 of the TSJ Madrid).
There is an advanced project to build an AVE high-speed train station in Ezkio-Itsaso that would become an important travel hub connecting the Basque Y to Navarre.
However, a connection to Navarre from Vitoria-Gasteiz is also studied.[1]