Bretonnières has a population (as of December 2018) of 264.
 As of 2008, 3.9% of the population are resident foreign nationals.
 Over the last 10 years (1999–2009 ) the population has changed at a rate of -1.4%.
 It has changed at a rate of -1% due to migration and at a rate of -0.5% due to births and deaths.

Most of the population (as of 2000) speaks French (195 or 97.5%), with German being second most common (3 or 1.5%) and Italian being third (1 or 0.5%).

The age distribution, as of 2009, in Bretonnières is; 15 children or 7.4% of the population are between 0 and 9 years old and 25 teenagers or 12.3% are between 10 and 19.
 Of the adult population, 20 people or 9.8% of the population are between 20 and 29 years old.
 22 people or 10.8% are between 30 and 39, 40 people or 19.6% are between 40 and 49, and 30 people or 14.7% are between 50 and 59.
 The senior population distribution is 28 people or 13.7% of the population are between 60 and 69 years old, 16 people or 7.8% are between 70 and 79, there are 8 people or 3.9% who are between 80 and 89.

As of 2000, there were 74 people who were single and never married in the municipality.
 There were 110 married individuals, 9 widows or widowers and 7 individuals who are divorced.

As of 2000, there were 80 private households in the municipality, and an average of 2.5 persons per household.
 There were 21 households that consist of only one person and 9 households with five or more people.
 Out of a total of 81 households that answered this question, 25.9% were households made up of just one person.
 Of the rest of the households, there are 26 married couples without children, 31 married couples with children  There were 2 households that were made up of unrelated people and 1 household that was made up of some sort of institution or another collective housing.

In 2000 there were 48 single family homes (or 66.7% of the total) out of a total of 72 inhabited buildings.
 There were 10 multi-family buildings (13.9%), along with 11 multi-purpose buildings that were mostly used for housing (15.3%) and 3 other use buildings (commercial or industrial) that also had some housing (4.2%).

In 2000, a total of 75 apartments (82.4% of the total) were permanently occupied, while 13 apartments (14.3%) were seasonally occupied and 3 apartments (3.3%) 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:
Bretonnières has a population (as of December 2018) of 264.  As of 2008, 3.9% of the population are resident foreign nationals.  Over the last 10 years (1999–2009 ) the population has changed at a rate of -1.4%.  It has changed at a rate of -1% due to migration and at a rate of -0.5% due to births and deaths.
Most of the population (as of 2000) speaks French (195 or 97.5%), with German being second most common (3 or 1.5%) and Italian being third (1 or 0.5%).
The age distribution, as of 2009, in Bretonnières is; 15 children or 7.4% of the population are between 0 and 9 years old and 25 teenagers or 12.3% are between 10 and 19.  Of the adult population, 20 people or 9.8% of the population are between 20 and 29 years old.  22 people or 10.8% are between 30 and 39, 40 people or 19.6% are between 40 and 49, and 30 people or 14.7% are between 50 and 59.  The senior population distribution is 28 people or 13.7% of the population are between 60 and 69 years old, 16 people or 7.8% are between 70 and 79, there are 8 people or 3.9% who are between 80 and 89.
As of 2000, there were 74 people who were single and never married in the municipality.  There were 110 married individuals, 9 widows or widowers and 7 individuals who are divorced.
As of 2000, there were 80 private households in the municipality, and an average of 2.5 persons per household.  There were 21 households that consist of only one person and 9 households with five or more people.  Out of a total of 81 households that answered this question, 25.9% were households made up of just one person.  Of the rest of the households, there are 26 married couples without children, 31 married couples with children  There were 2 households that were made up of unrelated people and 1 household that was made up of some sort of institution or another collective housing.
In 2000 there were 48 single family homes (or 66.7% of the total) out of a total of 72 inhabited buildings.  There were 10 multi-family buildings (13.9%), along with 11 multi-purpose buildings that were mostly used for housing (15.3%) and 3 other use buildings (commercial or industrial) that also had some housing (4.2%).
In 2000, a total of 75 apartments (82.4% of the total) were permanently occupied, while 13 apartments (14.3%) were seasonally occupied and 3 apartments (3.3%) 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:
Bretonnières