Sierre has a population of. Most of the population speaks French as their first language, German is the second most common and Italian is the third. There are 15 people who speak Romansh. , the gender distribution of the population was 49.2% male and 50.8% female. The population was made up of 16,070 Swiss men and 6,533 non-Swiss men. There were 17,331 Swiss women and 5,970 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. , there were 15,872 people who were single and never married in the district. There were 19,763 married individuals, 2,406 widows or widowers and 1,977 individuals who are divorced. There were 5,349 households that consist of only one person and 968 households with five or more people. Out of a total of 16,811 households that answered this question, 31.8% were households made up of just one person and there were 166 adults who lived with their parents. Of the rest of the households, there are 4,312 married couples without children, 5,215 married couples with children There were 941 single parents with a child or children. There were 225 households that were made up of unrelated people and 603 households that were made up of some sort of institution or another collective housing. The historical population is given in the following chart: Colors= id:lightgrey value:gray id:darkgrey value:gray ImageSize = width:960 height:210 PlotArea = height:150 left:100 bottom:50 right:100 AlignBars = justify DateFormat = x.y Period = from:0 till:41000 TimeAxis = orientation:vertical AlignBars = justify ScaleMajor = gridcolor:darkgrey increment:8000 start:0 ScaleMinor = gridcolor:lightgrey increment:1600 start:0 PlotData= color:yellowgreen width:40 mark: align:center bar:1850 from:start till:7335 text:"7,335" bar:1860 from:start till:8302 text:"8,302" bar:1870 from:start till:9157 text:"9,157" bar:1880 from:start till:9656 text:"9,656" bar:1888 from:start till:10138 text:"10,138" bar:1900 from:start till:11567 text:"11,567" bar:1910 from:start till:14441 text:"14,441" bar:1920 from:start till:15740 text:"15,740" bar:1930 from:start till:18686 text:"18,686" bar:1941 from:start till:20954 text:"20,954" bar:1950 from:start till:22965 text:"22,965" bar:1960 from:start till:24598 text:"24,598" bar:1970 from:start till:29731 text:"29,731" bar:1980 from:start till:32101 text:"32,101" bar:1990 from:start till:37683 text:"37,683" bar:2000 from:start till:40018 text:"40,018"
On 1 January 2009 the municipalities of Val d'Anniviers merged to form Anniviers. At the same time Granges merged into the municipality of Sierre. On 1 January 2017 the former municipalities of Chermignon, Mollens, Montana and Randogne merged to form the new municipality of Crans-Montana.
Politics
In the 2007 federal election the most popular party was the CVP which received 37.4% of the vote. The next three most popular parties were the FDP, the SP and the SVP. In the federal election, a total of 16,632 votes were cast, and the voter turnout was 61.3%. In the 2009 Conseil d'Etat/Staatsrat election a total of 15,565 votes were cast, of which 1,099 or about 7.1% were invalid. The voter participation was 57.9%, which is similar to the cantonal average of 54.67%. In the 2007 Swiss Council of States election a total of 16,401 votes were cast, of which 1,251 or about 7.6% were invalid. The voter participation was 61.5%, which is similar to the cantonal average of 59.88%.
Religion
From the, 31,439 or 78.6% were Roman Catholic, while 2,146 or 5.4% belonged to the Swiss Reformed Church. Of the rest of the population, there were 1,015 members of an Orthodox church, there were 17 individuals who belonged to the Christian Catholic Church, and there were 637 individuals who belonged to another Christian church. There were 62 individuals who were Jewish, and 719 who were Islamic. There were 56 individuals who were Buddhist, 49 individuals who were Hindu and 59 individuals who belonged to another church. 1,945 belonged to no church, are agnostic or atheist, and 2,169 individuals did not answer the question.
Weather
Sierre town has an average of 87.2 days of rain or snow per year and on average receives of precipitation. The wettest month is December during which time Sierre receives an average of of rain or snow. During this month there is precipitation for an average of 7.9 days. The month with the most days of precipitation is August, with an average of 8.4, but with only of rain or snow. The driest month of the year is September with an average of of precipitation over 5.7 days.
Education
In Sierre about 13,162 or of the population have completed non-mandatory upper secondary education, and 4,878 or have completed additional higher education. Of the 4,878 who completed tertiary schooling, 53.6% were Swiss men, 26.8% were Swiss women, 11.3% were non-Swiss men and 8.3% were non-Swiss women.
