Dazio is a comune in the Province of Sondrio in the Italian region Lombardy, located about 80 kilometres northeast of Milan and about …Dazio is a comune in the Province of Sondrio in the Italian region Lombardy, located about 80 kilometres northeast of Milan and about 20 kilometres west of Sondrio. As of 31 December 2004, it had a population of 380 and an area of 3.7 square kilometres.