born in the same canton, while 124 or 11.1% were born somewhere else in Switzerland, and 101 or 9.1% were born outside of Switzerland. , children and teenagers (0–19 years old) make up 28.5% of the population, while adults (20–64 years old) make up 63.9% and seniors (over 64 years old) make up 7.5%. , there were 481 people who were single and never married in the municipality. There were 574 married individuals, 23 widows or widowers and 36 individuals who are divorced. , there were 396 private households in the municipality, and an average of 2.8 persons per household. There were 72 households that consist of only one person and 42 households with five or more people. , a total of 389 apartments (93.1% of the total) were permanently occupied, while 24 apartments (5.7%) were seasonally occupied and 5 apartments (1.2%) were empty. , the construction rate of new housing units was 3.3 new units per 1000 residents. The vacancy rate for the municipality, , was 0.86%. The historical population is given in the following chart: Heritage sites of national significance The ruin of Illens Castle is listed as a Swiss heritage site of national significance. Twin Town Rossens is twinned with the town of St-Rémy in the Deux-Sèvres départment in France. Politics In the 2011 federal election the most popular party was the SPS which received 33.9% of the vote. The next three most popular parties were the CVP (23.3%), the SVP (16.2%) and the FDP (10.2%). The SPS received about the same percentage of the vote as they did in the 2007 Federal election (30.3% in 2007 vs 33.9% in 2011). The CVP lost popularity (28.6% in 2007), the SVP retained about the same popularity (18.3% in 2007) and the FDP retained about the same popularity (8.1% in 2007). A total of 484 votes were cast in this election, of which 7 or 1.4% were invalid. Economy , Rossens had an unemployment rate of 1.5%. , there were 22 people employed in the primary economic sector and about 9 businesses involved in this sector. 404 people were employed in the secondary sector and there were 10 businesses in this sector. 147 people were employed in the tertiary sector, with 34 businesses in this sector. There were 606 residents of the municipality who were employed in some capacity, of which females made up 44.4% of the workforce. the