Ignoring immigration and emigration, the population of Swiss citizens increased by 2 while the foreign population remained the same. At the same time, there were 3 non-Swiss men and 1 non-Swiss woman who immigrated from another country to Switzerland. The total Swiss population change in 2008 (from all sources, including moves across municipal borders) was an increase of 14 and the non-Swiss population increased by 3 people. This represents a population growth rate of 4.6%. The age distribution, , in Villars-Tiercelin is; 60 children or 14.9% of the population are between 0 and 9 years old and 56 teenagers or 13.9% are between 10 and 19. Of the adult population, 28 people or 6.9% of the population are between 20 and 29 years old. 57 people or 14.1% are between 30 and 39, 68 people or 16.9% are between 40 and 49, and 47 people or 11.7% are between 50 and 59. The senior population distribution is 58 people or 14.4% of the population are between 60 and 69 years old, 18 people or 4.5% are between 70 and 79, there are 9 people or 2.2% who are between 80 and 89, and there are 2 people or 0.5% who are 90 and older.  , there were 124 people who were single and never married in the municipality. There were 182 married individuals, 15 widows or widowers and 22 individuals who are divorced.  , there were 149 private households in the municipality, and an average of 2.3 persons per household. There were 43 households that consist of only one person and 6 households with five or more people. Out of a total of 151 households that answered this question, 28.5% were households made up of just one person. Of the rest of the households, there are 49 married couples without children, 44 married couples with children There were 10 single parents with a child or children. There were 3 households that were made up of unrelated people and 2 households that were made up of some sort of institution or another collective housing. The historical population is given in the following chart: In the 2007 federal election the most popular party was the SVP which received 33.27% of the vote. The next three most popular parties were the SP (14.63%), the FDP (13.69%) and the CVP (9.53%). In the federal election, a total of 125 votes were cast, and the voter turnout was 49.6%.