Duronia is a comune in the Province of Campobasso in the Italian region Molise, located about 20 kilometres northwest of Campobasso. As of …Duronia is a comune in the Province of Campobasso in the Italian region Molise, located about 20 kilometres northwest of Campobasso. As of 31 December 2004, it had a population of 473 and an area of 22.2 square kilometres.