Bernex has a population (as of December 2018) of 10,234.
 As of 2008, 19.9% of the population are resident foreign nationals.
 Over the last 10 years (1999–2009 ) the population has changed at a rate of 11.2%.
 It has changed at a rate of 7.3% due to migration and at a rate of 1.5% due to births and deaths.

Most of the population (as of 2000) speaks French (7,759 or 85.5%), with German being second most common (421 or 4.6%) and English being third (193 or 2.1%).
 There are 3 people who speak Romansh and 168 people who speak Italian.

As of 2008, the gender distribution of the population was 49.2% male and 50.8% female.
The population was made up of 3,650 Swiss men (37.4% of the population) and 1,151 (11.8%) non-Swiss men.
 There were 4,039 Swiss women (41.4%) and 915 (9.4%) non-Swiss women.
 Of the population in the municipality 1,839 or about 20.3% were born in Bernex and lived there in 2000.
 As of 2014, the origin of population was 44.7% were born in Geneva, 33% were born in other place of Switzerland, 22,4% were foreigners including 15,7% from European countries.

In 2008 there were 84 live births to Swiss citizens and 22 births to non-Swiss citizens, and in same time span there were 53 deaths of Swiss citizens and 7 non-Swiss citizen deaths.
 Ignoring immigration and emigration, the population of Swiss citizens increased by 31 while the foreign population increased by 15.
 There were 23 Swiss men and 27 Swiss women who emigrated from Switzerland.
 At the same time, there were 29 non-Swiss men and 37 non-Swiss women 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 82 and the non-Swiss population increased by 80 people.
 This represents a population growth rate of 1.7%.
 The age distribution of the population (as of 2000) is children and teenagers (0–19 years old) make up 24.3% of the population, while adults (20–64 years old) make up 63.1% and seniors (over 64 years old) make up 12.6%.

As of 2000, there were 3,792 people who were single and never married in the municipality.
 There were 4,257 married individuals, 420 widows or widowers and 607 individuals who are divorced.

As of 2000, there were 3,335 private households in the municipality, and an average of 2.5 persons per household.
 There were 912 households that consist of only one person and 196 households with five or more people.
 Out of a total of 3,438 households that answered this question, 26.5% were households made up of just one person and there were 16 adults who lived with their parents.
 Of the rest of the households, there are 874 married couples without children, 1,226 married couples with children  There were 274 single parents with a child or children.
 There were 33 households that were made up of unrelated people and 103 households that were made up of some sort of institution or another collective housing.

In 2000 there were 790 single family homes (or 60.6% of the total) out of a total of 1,304 inhabited buildings.
 There were 316 multi-family buildings (24.2%), along with 151 multi-purpose buildings that were mostly used for housing (11.6%) and 47 other use buildings (commercial or industrial) that also had some housing (3.6%).
 Of the single family homes 90 were built before 1919, while 105 were built between 1990 and 2000.
 The greatest number of single family homes (184) were built between 1971 and 1980.

In 2000 there were 3,456 apartments in the municipality.
 The most common apartment size was 4 rooms of which there were 951.
 There were 216 single room apartments and 958 apartments with five or more rooms.
 Of these apartments, a total of 3,211 apartments (92.9% of the total) were permanently occupied, while 205 apartments (5.9%) were seasonally occupied and 40 apartments (1.2%) were empty.
 As of 2009, the construction rate of new housing units was 1.7 new units per 1000 residents.
 The vacancy rate for the municipality, in 2010, was 0.21%.

The historical population is given in the following chart:
Bernex has a population (as of December 2018) of 10,234.  As of 2008, 19.9% of the population are resident foreign nationals.  Over the last 10 years (1999–2009 ) the population has changed at a rate of 11.2%.  It has changed at a rate of 7.3% due to migration and at a rate of 1.5% due to births and deaths.
Most of the population (as of 2000) speaks French (7,759 or 85.5%), with German being second most common (421 or 4.6%) and English being third (193 or 2.1%).  There are 3 people who speak Romansh and 168 people who speak Italian.
As of 2008, the gender distribution of the population was 49.2% male and 50.8% female. The population was made up of 3,650 Swiss men (37.4% of the population) and 1,151 (11.8%) non-Swiss men.  There were 4,039 Swiss women (41.4%) and 915 (9.4%) non-Swiss women.  Of the population in the municipality 1,839 or about 20.3% were born in Bernex and lived there in 2000.  As of 2014, the origin of population was 44.7% were born in Geneva, 33% were born in other place of Switzerland, 22,4% were foreigners including 15,7% from European countries.
In 2008 there were 84 live births to Swiss citizens and 22 births to non-Swiss citizens, and in same time span there were 53 deaths of Swiss citizens and 7 non-Swiss citizen deaths.  Ignoring immigration and emigration, the population of Swiss citizens increased by 31 while the foreign population increased by 15.  There were 23 Swiss men and 27 Swiss women who emigrated from Switzerland.  At the same time, there were 29 non-Swiss men and 37 non-Swiss women 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 82 and the non-Swiss population increased by 80 people.  This represents a population growth rate of 1.7%.  The age distribution of the population (as of 2000) is children and teenagers (0–19 years old) make up 24.3% of the population, while adults (20–64 years old) make up 63.1% and seniors (over 64 years old) make up 12.6%.
As of 2000, there were 3,792 people who were single and never married in the municipality.  There were 4,257 married individuals, 420 widows or widowers and 607 individuals who are divorced.
As of 2000, there were 3,335 private households in the municipality, and an average of 2.5 persons per household.  There were 912 households that consist of only one person and 196 households with five or more people.  Out of a total of 3,438 households that answered this question, 26.5% were households made up of just one person and there were 16 adults who lived with their parents.  Of the rest of the households, there are 874 married couples without children, 1,226 married couples with children  There were 274 single parents with a child or children.  There were 33 households that were made up of unrelated people and 103 households that were made up of some sort of institution or another collective housing.
In 2000 there were 790 single family homes (or 60.6% of the total) out of a total of 1,304 inhabited buildings.  There were 316 multi-family buildings (24.2%), along with 151 multi-purpose buildings that were mostly used for housing (11.6%) and 47 other use buildings (commercial or industrial) that also had some housing (3.6%).  Of the single family homes 90 were built before 1919, while 105 were built between 1990 and 2000.  The greatest number of single family homes (184) were built between 1971 and 1980.
In 2000 there were 3,456 apartments in the municipality.  The most common apartment size was 4 rooms of which there were 951.  There were 216 single room apartments and 958 apartments with five or more rooms.  Of these apartments, a total of 3,211 apartments (92.9% of the total) were permanently occupied, while 205 apartments (5.9%) were seasonally occupied and 40 apartments (1.2%) were empty.  As of 2009, the construction rate of new housing units was 1.7 new units per 1000 residents.  The vacancy rate for the municipality, in 2010, was 0.21%.
The historical population is given in the following chart:
Bernex, Switzerland