Longano is a comune in the Province of Isernia in the Italian region of Molise, located about 35 kilometres west of Campobasso and about …Longano is a comune in the Province of Isernia in the Italian region of Molise, located about 35 kilometres west of Campobasso and about 9 kilometres south of Isernia. As of 31 December 2004, it had a population of 720 and an area of 27.1 square kilometres.