2009 District de Moutier, the municipality's former district, was dissolved. On the following day, 1 January 2010, it joined the newly created Arrondissement administratif Jura bernois. Coat of arms The blazon of the municipal coat of arms is Per pale Argent and Gules two Keys counterchanged . Demographics Perrefitte has a population () of . , 11.7% of the population are resident foreign nationals. Over the last 10 years (2001-2011) the population has changed at a rate of -3.3%. Migration accounted for -2.9%, while births and deaths accounted for -0.6%. Most of the population () speaks French (401 or 84.2%) as their first language, German is the second most common (44 or 9.2%) and Italian is the third (14 or 2.9%). , the population was 48.3% male and 51.7% female. The population was made up of 201 Swiss men (41.9% of the population) and 31 (6.5%) non-Swiss men. There were 223 Swiss women (46.5%) and 25 (5.2%) non-Swiss women. Of the population in the municipality, 131 or about 27.5% were born in Perrefitte and lived there in 2000. There were 161 or 33.8% who were born in the same canton, while 110 or 23.1% were born somewhere else in Switzerland, and 56 or 11.8% were born outside of Switzerland. , children and teenagers (0–19 years old) make up 18.5% of the population, while adults (20–64 years old) make up 59.9% and seniors (over 64 years old) make up 21.6%. , there were 180 people who were single and never married in the municipality. There were 259 married individuals, 28 widows or widowers and 9 individuals who are divorced. , there were 54 households that consist of only one person and 13 households with five or more people. , a total of 197 apartments (82.8% of the total) were permanently occupied, while 33 apartments (13.9%) were seasonally occupied and 8 apartments (3.4%) were empty. , the construction rate of new housing units was 2.1 new units per 1000 residents. The vacancy rate for the municipality, , was 8.66%. In 2011, single family homes made up 66.5% of the total housing in the municipality. The historical population is given in the following chart: Politics In the 2011 federal election the most popular party was the Swiss People's Party (SVP) which received 42.6% of the vote. The next three most popular parties were the Social Democratic Party (SP) (14.4%), the Christian Democratic People's