 Of the population in the municipality, 457 or about 44.8% were born in Semsales and lived there in 2000.There were 260 or 25.5% who were born in the same canton, while 171 or 16.8% were born somewhere else in Switzerland, and 80 or 7.9% were born outside of Switzerland., children and teenagers (0–19 years old) make up 23.6% of the population, while adults (20–64 years old) make up 60.7% and seniors (over 64 years old) make up 15.7%.