, the gender distribution of the population was 49.7% male and 50.3% female. The population was made up of 729 Swiss citizens (92.7% of the population), and 57 non-Swiss residents (7.3%) Of the population in the municipality 306 or about 43.0% were born in Bretzwil and lived there in 2000. There were 128 or 18.0% who were born in the same canton, while 201 or 28.2% were born somewhere else in Switzerland, and 58 or 8.1% were born outside of Switzerland.