 The total Swiss population change in 2008 (from all sources, including moves across municipal borders) was an increase of 1 and the non-Swiss population remained the same.This represents a population growth rate of 0.1%.The age distribution, , in Monteggio is; 82 children or 9.2% of the population are between 0 and 9 years old and 77 teenagers or 8.7% are between 10 and 19.