Bianzone is a comune (municipality) in the Province of Sondrio in the Italian region Lombardy, located about 110 km northeast of Milan and about 20 km east of Sondrio, on the border with Switzerland. As of 31 December 2004, it had a population of 1,250 and an area of 17.3 km2. The municipality of Bianzone contains the frazioni (subdivisions, mainly villages and hamlets) Bratta, Piazzeda, Campei, Campione, and Nemina. Bianzone borders the following municipalities: Brusio (Switzerland), Teglio, Villa di Tirano.

Demographic evolution