of 2 and the non-Swiss population increased by 1 people. This represents a population growth rate of 0.7%. The age distribution, , in Oulens-sous-Échallens is; 67 children or 13.8% of the population are between 0 and 9 years old and 63 teenagers or 13.0% are between 10 and 19. Of the adult population, 53 people or 10.9% of the population are between 20 and 29 years old. 87 people or 17.9% are between 30 and 39, 67 people or 13.8% are between 40 and 49, and 57 people or 11.7% are between 50 and 59. The senior population distribution is 57 people or 11.7% of the population are between 60 and 69 years old, 21 people or 4.3% are between 70 and 79, there are 11 people or 2.3% who are between 80 and 89, and there are 3 people or 0.6% who are 90 and older. , there were 181 people who were single and never married in the municipality. There were 209 married individuals, 20 widows or widowers and 17 individuals who are divorced. , there were 173 private households in the municipality, and an average of 2.4 persons per household. There were 56 households that consist of only one person and 18 households with five or more people. Out of a total of 174 households that answered this question, 32.2% were households made up of just one person. Of the rest of the households, there are 50 married couples without children, 59 married couples with children There were 7 single parents with a child or children. There was 1 household that was made up of unrelated people and 1 household that was made up of some sort of institution or another collective housing. there were 55 single family homes (or 51.4% of the total) out of a total of 107 inhabited buildings. There were 16 multi-family buildings (15.0%), along with 31 multi-purpose buildings that were mostly used for housing (29.0%) and 5 other use buildings (commercial or industrial) that also had some housing (4.7%). Of the single family homes 20 were built before 1919, while 7 were built between 1990 and 2000. The most multi-family homes (4) were built between 1981 and 1990 and the next most (3) were built before 1919. There were 2 multi-family houses built between 1996 and 2000. there were 173 apartments in the municipality. The most common apartment size was 5 rooms