Demographics
Onnens has a population (as of December 2011) of 477. As of 2008, 14.2% of the population are resident foreign nationals. Over the last 10 years (1999–2009 ) the population has changed at a rate of 18.2%. It has changed at a rate of 10.5% due to migration and at a rate of 9.2% due to births and deaths.
Most of the population (as of 2000) speaks French (354 or 89.2%), with German being second most common (18 or 4.5%) and Portuguese being third (8 or 2.0%). There are 6 people who speak Italian.
Of the population in the municipality 97 or about 24.4% were born in Onnens and lived there in 2000. There were 145 or 36.5% who were born in the same canton, while 73 or 18.4% were born somewhere else in Switzerland, and 62 or 15.6% were born outside of Switzerland.
In 2008 there were 3 live births to Swiss citizens and 1 birth to non-Swiss citizens, and in same time span there was 1 death of a Swiss citizen and 1 non-Swiss citizen death. Ignoring immigration and emigration, the population of Swiss citizens increased by 2 while the foreign population remained the same. There were 2 Swiss men and 1 Swiss woman who emigrated from Switzerland. At the same time, there were 2 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 2 and the non-Swiss population increased by 4 people. This represents a population growth rate of 1.3%.
The age distribution, as of 2009, in Onnens is; 66 children or 14.7% of the population are between 0 and 9 years old and 50 teenagers or 11.1% are between 10 and 19. Of the adult population, 49 people or 10.9% of the population are between 20 and 29 years old. 70 people or 15.6% are between 30 and 39, 77 people or 17.1% are between 40 and 49, and 48 people or 10.7% are between 50 and 59. The senior population distribution is 54 people or 12.0% of the population are between 60 and 69 years old, 19 people or 4.2% are between 70 and 79, there are 14 people or 3.1% who are between 80 and 89, and there are 2 people or 0.4% who are 90 and older.
As of 2000, there were 155 people who were single and never married in the municipality. There were 197 married individuals, 25 widows or widowers and 20 individuals who are divorced.
As of 2000, there were 160 private households in the municipality, and an average of 2.4 persons per household. There were 41 households that consist of only one person and 15 households with five or more people. Out of a total of 167 households that answered this question, 24.6% were households made up of just one person and there was 1 adult who lived with their parents. Of the rest of the households, there are 59 married couples without children, 47 married couples with children There were 8 single parents with a child or children. There were 4 households that were made up of unrelated people and 7 households that were made up of some sort of institution or another collective housing.
In 2000 there were 64 single family homes (or 53.8% of the total) out of a total of 119 inhabited buildings. There were 27 multi-family buildings (22.7%), along with 19 multi-purpose buildings that were mostly used for housing (16.0%) and 9 other use buildings (commercial or industrial) that also had some housing (7.6%). Of the single family homes 27 were built before 1919, while 6 were built between 1990 and 2000. The most multi-family homes (12) were built before 1919 and the next most (3) were built between 1946 and 1960. There was 1 multi-family house built between 1996 and 2000.
In 2000 there were 188 apartments in the municipality. The most common apartment size was 3 rooms of which there were 52. There were 5 single room apartments and 58 apartments with five or more rooms. Of these apartments, a total of 152 apartments (80.9% of the total) were permanently occupied, while 29 apartments (15.4%) were seasonally occupied and 7 apartments (3.7%) were empty. As of 2009, the construction rate of new housing units was 0 new units per 1000 residents. The vacancy rate for the municipality, in 2010, was 0%.
The historical population is given in the following chart:
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