Historically, the area was connected with the neighbouring village of Savogna d'Isonzo (Slovenian: Sovodnje ob Soči), which was left in Italy after the Paris Peace Treaty of February 1947. Since the second half of the 19th century, Miren has been a commercial center and a center of light industry, strongly linked to the Gorizia and Monfalcone (Slovenian: Tržič) urban areas. Kostanjevica na Krasu, on the other hand, is a center of a larger underpopulated rural area located on the high Karst Plateau. In the local self-government reform of 1994, the two centers united to form a single municipality. Since 1947, both localities have gravitated towards the Nova Gorica–Šempeter conurbation, where many locals commute daily.
