Verzasca is a municipality in the district of Locarno in the canton of Ticino in Switzerland.

As one of the main towns of the upper valley, it and Vogorno alternately presented the candidates for the offices of Podestà and governor.

Since the 14th century many of the residents have spent their winters with their cattle in the Magadino valley.

[5] During the Middle Ages, Frasco was part of the greater Vicinanza of Verzasca.

For centuries, the inhabitants lived on agriculture and alpine seasonal migrations with livestock.

Starting in 1870, the Val d'Efra, a vein of white marble, was exploited for limestone quarries.

[6] During the Middle Ages, Sonogno was part of the Vicinanza of Verzasca and shared the fate of the valley.

[7] The more recent exodus to urban centers, combined with emigration have caused a steady decline of population since the mid-nineteenth century.

[9] The historical population is given in the following chart:[10] The entire villages of Corippo, Brione (Verzasca) and Sonogno are designated as part of the Inventory of Swiss Heritage Sites.