Demographics
Grens has a population (as of December 2011) of 365. As of 2008, 17.5% of the population are resident foreign nationals. Over the last 10 years (1999–2009 ) the population has changed at a rate of 19.5%. It has changed at a rate of 7% due to migration and at a rate of 12.9% due to births and deaths.
Most of the population (as of 2000) speaks French (261 or 82.6%), with English being second most common (26 or 8.2%) and German being third (15 or 4.7%). There is 1 person who speaks Italian.
The age distribution, as of 2009, in Grens is; 52 children or 14.5% of the population are between 0 and 9 years old and 61 teenagers or 17.0% are between 10 and 19. Of the adult population, 23 people or 6.4% of the population are between 20 and 29 years old. 47 people or 13.1% are between 30 and 39, 79 people or 22.1% are between 40 and 49, and 29 people or 8.1% are between 50 and 59. The senior population distribution is 37 people or 10.3% of the population are between 60 and 69 years old, 22 people or 6.1% are between 70 and 79, there are 5 people or 1.4% who are between 80 and 89, and there are 3 people or 0.8% who are 90 and older.
As of 2000, there were 135 people who were single and never married in the municipality. There were 163 married individuals, 9 widows or widowers and 9 individuals who are divorced.
As of 2000, there were 110 private households in the municipality, and an average of 2.8 persons per household. There were 21 households that consist of only one person and 13 households with five or more people. Out of a total of 114 households that answered this question, 18.4% were households made up of just one person. Of the rest of the households, there are 29 married couples without children, 54 married couples with children There were 4 single parents with a child or children. There were 2 households that were made up of unrelated people and 4 households that were made up of some sort of institution or another collective housing.
In 2000 there were 46 single family homes (or 56.8% of the total) out of a total of 81 inhabited buildings. There were 12 multi-family buildings (14.8%), along with 22 multi-purpose buildings that were mostly used for housing (27.2%) and 1 other use buildings (commercial or industrial) that also had some housing (1.2%).
In 2000, a total of 105 apartments (89.7% of the total) were permanently occupied, while 9 apartments (7.7%) were seasonally occupied and 3 apartments (2.6%) 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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