Prata Camportaccio is a comune (municipality) in the Province of Sondrio in the Italian region Lombardy , located about 100 kilometres (62 mi) north of Milan and about 40 kilometres (25 mi) northwest of Sondrio. As of 31 December 2004, it had a population of 2,758 and an area of 27.9 square kilometres (10.8 sq mi).

Prata Camportaccio borders the following municipalities: Chiavenna , Gordona , Mese, Novate Mezzola , Piuro , Samolaco .