Sonogno is a village and former municipality in the district of Locarno in the canton of Ticino in Switzerland.

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

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

[4] Sonogno had an area, as of 1997[update], of 37.52 square kilometers (14.49 sq mi).

Out of the forested land, 11.7% of the total land area is heavily forested, while 12.2% is covered in small trees and shrubbery and 3.5% is covered with orchards or small clusters of trees.

The blazon of the municipal coat of arms is Argent a chamois sable statant and in base three mullets azure, two and one.

Most of the population (as of 2000[update]) speaks Italian (93.0%), with German being second most common (2.3%) and French being third (2.3%).

[8] The age distribution, as of 2009[update], in Sonogno is; 7 children or 7.9% of the population are between 0 and 9 years old and 5 teenagers or 5.6% are between 10 and 19.

[9] The historical population is given in the following table:[4] The entire village of Sonogno is designated as part of the Inventory of Swiss Heritage Sites.

[14] In the 2007 federal election the most popular party was the CVP which received 28.16% of the vote.

In the federal election, a total of 26 votes were cast, and the voter turnout was 28.9%.

[15] In the 2007[update] Gran Consiglio election, there were a total of 89 registered voters in Sonogno, of which 51 or 57.3% voted.

[16] In the 2007[update] Consiglio di Stato election, The most popular party was the PS which received 13 or 25.5% of the vote.

[18] From the 2000 census[update], 74 or 86.0% were Roman Catholic, while 1 or 1.2% belonged to the Swiss Reformed Church.

The wettest month is September during which time Sonogno receives an average of 249 mm (9.8 in) of rain or snow.

The driest month of the year is December with an average of 78 mm (3.1 in) of precipitation over 6.4 days.

In the lower secondary school system, students either attend a two-year middle school followed by a two-year pre-apprenticeship or they attend a four-year program to prepare for higher education.

The events of the German novel, The Black Brothers, and the anime based on it (Romeo's Blue Skies), follow a young boy from Sonogno village who sold himself to work as a chimney sweep in Milan, Italy.

It was inspired by a real event where a ferry carrying chimney sweeps sunk in a storm.