Jura is a département in the Bourgogne-Franche-Comté region in Eastern France. Named after the Jura Mountains, its prefecture is Lons-le-Sa…Jura is a département in the Bourgogne-Franche-Comté region in Eastern France. Named after the Jura Mountains, its prefecture is Lons-le-Saunier. Its subprefectures are Dole and Saint-Claude. In 2019, Jura had a population of 259,199. Its INSEE code is 39. It has a short portion of the border of Switzerland.