Roasio is a comune (municipality) in the Province of Vercelli in the Italian region Piedmont, located about 80 kilometres (50 mi) northeast of Turin and about 35 kilometres (22 mi) northwest of Vercelli. As of 31 December 2004, it had a population of 2,517 and an area of 28.1 square kilometres (10.8 sq mi).[1]