Demographics
Gilly has a population (as of December 2011) of 964. As of 2008, 22.9% of the population are resident foreign nationals. Over the last 10 years (1999–2009 ) the population has changed at a rate of 28.5%. It has changed at a rate of 26.1% due to migration and at a rate of 2.9% due to births and deaths.
Most of the population (as of 2000) speaks French (638 or 83.1%), with German being second most common (47 or 6.1%) and English being third (30 or 3.9%). There are 7 people who speak Italian.
The age distribution, as of 2009, in Gilly is; 121 children or 13.0% of the population are between 0 and 9 years old and 139 teenagers or 14.9% are between 10 and 19. Of the adult population, 62 people or 6.6% of the population are between 20 and 29 years old. 133 people or 14.2% are between 30 and 39, 183 people or 19.6% are between 40 and 49, and 126 people or 13.5% are between 50 and 59. The senior population distribution is 77 people or 8.2% of the population are between 60 and 69 years old, 58 people or 6.2% are between 70 and 79, there are 30 people or 3.2% who are between 80 and 89, and there are 5 people or 0.5% who are 90 and older.
As of 2000, there were 305 people who were single and never married in the municipality. There were 389 married individuals, 38 widows or widowers and 36 individuals who are divorced.
As of 2000 the average number of residents per living room was 0.57 which is about equal to the cantonal average of 0.61 per room. In this case, a room is defined as space of a housing unit of at least 4 m² (43 sq ft) as normal bedrooms, dining rooms, living rooms, kitchens and habitable cellars and attics. About 49.2% of the total households were owner occupied, or in other words did not pay rent (though they may have a mortgage or a rent-to-own agreement).
As of 2000, there were 314 private households in the municipality, and an average of 2.4 persons per household. There were 95 households that consist of only one person and 15 households with five or more people. Out of a total of 322 households that answered this question, 29.5% were households made up of just one person and there were 3 adults who lived with their parents. Of the rest of the households, there are 92 married couples without children, 109 married couples with children There were 9 single parents with a child or children. There were 6 households that were made up of unrelated people and 8 households that were made up of some sort of institution or another collective housing.
In 2000 there were 122 single family homes (or 54.2% of the total) out of a total of 225 inhabited buildings. There were 48 multi-family buildings (21.3%), along with 40 multi-purpose buildings that were mostly used for housing (17.8%) and 15 other use buildings (commercial or industrial) that also had some housing (6.7%).
In 2000, a total of 303 apartments (84.4% of the total) were permanently occupied, while 42 apartments (11.7%) were seasonally occupied and 14 apartments (3.9%) were empty. As of 2009, the construction rate of new housing units was 2.1 new units per 1000 residents. The vacancy rate for the municipality, in 2010, was 0.7%.
The historical population is given in the following chart:
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