The population was made up of 16,070 Swiss men (35.0% of the population) and 6,533 (14.2%) non-Swiss men. There were 17,331 Swiss women (37.8%) and 5,970 (13.0%) non-Swiss women. Of the population in the district 15,421 or about 38.5% were born in Sierre and lived there in 2000. There were 10,133 or 25.3% who were born in the same canton, while 4,100 or 10.2% were born somewhere else in Switzerland, and 9,037 or 22.6% were born outside of Switzerland.

As of 2000, there were 15,872 people who were single and never married in the district.