 Of the population in the municipality 433 or about 43.5% were born in Fiesch and lived there in 2000.There were 272 or 27.3% who were born in the same canton, while 103 or 10.3% were born somewhere else in Switzerland, and 172 or 17.3% were born outside of Switzerland.The age distribution of the population () is children and teenagers (0–19 years old) make up 24.1% of the population, while adults (20–64 years old) make up 60% and seniors (over 64 years old) make up 15.9%.