 Of the population in the municipality 48 or about 61.5% were born in Zwischbergen and lived there in 2000.There were 14 or 17.9% who were born in the same canton, while 7 or 9.0% were born somewhere else in Switzerland, and 8 or 10.3% were born outside of Switzerland.The age distribution of the population () is children and teenagers (0–19 years old) make up 25.6% of the population, while adults (20–64 years old) make up 59% and seniors (over 64 years old) make up 15.4%.