Tonco is acomune (municipality) in theProvince of Asti in theItalian regionPiedmont, located about 40 kilometres (25 mi) east ofTurin and about 13 kilometres (8 mi) north ofAsti. As of 31 December 2004, it had a population of 895 and an area of 11.8 square kilometres (4.6 sq mi).[3]