 The total Swiss population change in 2008 (from all sources) was a decrease of 4 and the non-Swiss population change was an increase of 4 people.This represents a population growth rate of 0.0%.The age distribution, , in Mairengo is; 17 children or 3.0% of the population are between 0 and 9 years old and 31 teenagers or 5.4% are between 10 and 19.