 Of the Swiss national languages (), 5,577 speak German, 21 people speak French, 190 people speak Italian, and 7 people speak Romansh.The age distribution, , in Au is; 750 children or 11.7% of the population are between 0 and 9 years old and 792 teenagers or 12.4% are between 10 and 19.Of the adult population, 829 people or 12.9% of the population are between 20 and 29 years old.