Demographics
Marsens has a population (as of December 2011) of 1,653. As of 2008, 9.4% of the population are resident foreign nationals. Over the last 10 years (2000–2010) the population has changed at a rate of 24.7%. Migration accounted for 14.9%, while births and deaths accounted for 7.5%.
Most of the population (as of 2000) speaks French (1,041 or 92.7%) as their first language, German is the second most common (45 or 4.0%) and Italian is the third (11 or 1.0%).
As of 2008, the population was 50.3% male and 49.7% female. The population was made up of 734 Swiss men (45.0% of the population) and 86 (5.3%) non-Swiss men. There were 736 Swiss women (45.2%) and 74 (4.5%) non-Swiss women. Of the population in the municipality, 252 or about 22.4% were born in Marsens and lived there in 2000. There were 548 or 48.8% who were born in the same canton, while 148 or 13.2% were born somewhere else in Switzerland, and 127 or 11.3% were born outside of Switzerland.
As of 2000, children and teenagers (0–19 years old) make up 28.9% of the population, while adults (20–64 years old) make up 55.2% and seniors (over 64 years old) make up 15.9%.
As of 2000, there were 524 people who were single and never married in the municipality. There were 497 married individuals, 53 widows or widowers and 49 individuals who are divorced.
As of 2000, there were 437 private households in the municipality, and an average of 2.8 persons per household. There were 76 households that consist of only one person and 53 households with five or more people. In 2000, a total of 333 apartments (82.6% of the total) were permanently occupied, while 64 apartments (15.9%) were seasonally occupied and 6 apartments (1.5%) were empty. As of 2009, the construction rate of new housing units was 5.2 new units per 1000 residents.
The historical population is given in the following chart:
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