and seniors (over 64 years old) make up 13%. , there were 531 people who were single and never married in the municipality. There were 632 married individuals, 59 widows or widowers and 26 individuals who are divorced. , there were 453 private households in the municipality, and an average of 2.7 persons per household. There were 104 households that consist of only one person and 55 households with five or more people. , a total of 449 apartments (89.1% of the total) were permanently occupied, while 27 apartments (5.4%) were seasonally occupied and 28 apartments (5.6%) were empty. , the construction rate of new housing units was 4.9 new units per 1000 residents. The vacancy rate for the municipality, , was 0.54%. The historical population is given in the following chart: Heritage sites of national significance The former Church of Saint-Pierre and the farm house at Le Pré de la Maison 12 are listed as Swiss heritage site of national significance. Politics In the 2011 federal election the most popular party was the SVP which received 23.4% of the vote. The next three most popular parties were the SPS (23.2%), the FDP (21.9%) and the CVP (19.0%). The SVP improved their position in Treyvaux rising to first, from fourth in 2007 (with 19.2%) The SPS moved from third in 2007 (with 22.1%) to second in 2011, the FDP moved from first in 2007 (with 25.2%) to third and the CVP moved from second in 2007 (with 23.7%) to fourth. A total of 592 votes were cast in this election, of which 6 or 1.0% were invalid. Economy , Treyvaux had an unemployment rate of 1.7%. , there were 91 people employed in the primary economic sector and about 35 businesses involved in this sector. 238 people were employed in the secondary sector and there were 18 businesses in this sector. 119 people were employed in the tertiary sector, with 24 businesses in this sector. There were 611 residents of the municipality who were employed in some capacity, of which females made up 40.3% of the workforce. the total number of full-time equivalent jobs was 385. The number of jobs in the primary sector was 72, of which 68 were in agriculture and 4 were in forestry or lumber production. The number of jobs in the secondary sector was 217 of which 135 or (62.2%) were in manufacturing and 83