Tonco is a comune (municipality) in the Province of Asti in the Italian region Piedmont, located about 40km east of Turin and about 13km north of Asti. As of 31 December 2004, it had a population of 895 and an area of 11.8km2. Tonco borders the following municipalities: Alfiano Natta, Calliano, Castell'Alfero, Corsione, Frinco, Montiglio Monferrato, Villa San Secondo, and Villadeati.
