Vanzago is a comune in the Province of Milan in the Italian region Lombardy, located about 15 kilometres northwest of Milan. As of 31 December 2004, it had a population of 7,615 and an area of 6.2 square kilometres. The municipality of Vanzago contains the frazioni Mantegazza, Valdarenne, and Tre Campane. Vanzago borders the following municipalities: Pogliano Milanese, Pregnana Milanese, Arluno, Sedriano.