Montélimar is a town in the Drôme department in the Auvergne-Rhône-Alpes region in Southeastern France. It is the second-largest town in …Montélimar is a town in the Drôme department in the Auvergne-Rhône-Alpes region in Southeastern France. It is the second-largest town in the department after Valence. In 2018, the commune had a population of 39,415; its urban area had a population of 57,372.