, the gender distribution of the population was 50.9% male and 49.1% female. The population was made up of 1,036 Swiss men (42.3% of the population) and 210 (8.6%) non-Swiss men. There were 1,031 Swiss women (42.1%) and 171 (7.0%) non-Swiss women. Of the population in the municipality 718 or about 30.0% were born in Gretzenbach and lived there in 2000. There were 519 or 21.7% who were born in the same canton, while 784 or 32.8% were born somewhere else in Switzerland, and 318 or 13.3% were born outside of Switzerland.