, the population was 49.8% male and 50.2% female. The population was made up of 143 Swiss men (49.5% of the population) and 1 (0.3%) non-Swiss men. There were 142 Swiss women (49.1%) and 3 (1.0%) non-Swiss women. Of the population in the municipality, 85 or about 36.0% were born in Zwieselberg and lived there in 2000. There were 118 or 50.0% who were born in the same canton, while 26 or 11.0% were born somewhere else in Switzerland, and 2 or 0.8% were born outside of Switzerland.