 The total Swiss population change in 2008 (from all sources, including moves across municipal borders) was a decrease of 2 and the non-Swiss population change was an increase of 2 people.This represents a population growth rate of 0.0%.The age distribution, , 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.