Trarego Viggiona is a comune (municipality) in the Province of Verbano-Cusio-Ossola in the Italian region Piedmont, located about 130 km northeast of Turin and about 15 km north of Verbania. As of 31 December 2004, it had a population of 375 and an area of 18.8 km2. The municipality of Trarego Viggiona contains the frazioni (subdivisions, mainly villages and hamlets) Viggiona and Cheglio. Trarego Viggiona borders the following municipalities: Aurano, Cannero Riviera, Cannobio, Oggebbio, Valle Cannobina.

Demographic evolution