 Of the population in the municipality, 783 or about 26.5% were born in Thunstetten and lived there in 2000.There were 1,241 or 42.0% who were born in the same canton, while 554 or 18.7% were born somewhere else in Switzerland, and 364 or 12.3% were born outside of Switzerland., children and teenagers (0–19 years old) make up 21.9% of the population, while adults (20–64 years old) make up 60.6% and seniors (over 64 years old) make up 17.5%.