Sornico is a village and former municipality in the district of Vallemaggia in the canton of Ticino , Switzerland .

Sornico was a municipality of its own until 1864, when it merged with its neighbor Prato to form the new municipality Prato-Sornico .

In turn, Prato-Sornico municipality merged with its neighbors in 2004 to form a new and larger municipality Lavizzara .