Demographics
Interlaken has a population (as of December 2011) of 5,468. As of 2010, 26.4% of the population are resident foreign nationals. Over the last 10 years (2000–2010) the population has changed at a rate of 5.3%. Migration accounted for 8.2%, while births and deaths accounted for -1.9%.
Most of the population (as of 2000) speaks German (4,271 or 83.4%) as their first language, Portuguese is the second most common (198 or 3.9%) and Italian is the third (145 or 2.8%). There are 64 people who speak French and 11 people who speak Romansh.
As of 2008, the population was 47.5% male and 52.5% female. The population was made up of 1,830 Swiss men (33.7% of the population) and 751 (13.8%) non-Swiss men. There were 2,164 Swiss women (39.9%) and 684 (12.6%) non-Swiss women. Of the population in the municipality, 988 or about 19.3% were born in Interlaken and lived there in 2000. There were 1,923 or 37.6% who were born in the same canton, while 805 or 15.7% were born somewhere else in Switzerland, and 1,185 or 23.1% were born outside of Switzerland.
As of 2000, children and teenagers (0–19 years old) make up 19.3% of the population, while adults (20–64 years old) make up 63.1% and seniors (over 64 years old) make up 17.6%.
As of 2000, there were 2,158 people who were single and never married in the municipality. There were 2,288 married individuals, 367 widows or widowers and 306 individuals who are divorced.
As of 2000, there were 2,418 private households in the municipality, and an average of 2.0 persons per household. There were 1,041 households that consist of only one person and 74 households with five or more people. In 2000, a total of 2,292 apartments (83.5% of the total) were permanently occupied, while 329 apartments (12.0%) were seasonally occupied and 125 apartments (4.6%) were empty. As of 2009, the construction rate of new housing units was 4.6 new units per 1000 residents.
As of 2003 the average price to rent an average apartment in Interlaken was 1013.98 Swiss francs (CHF) per month (US$810, £460, €650 approx. exchange rate from 2003). The average rate for a one room apartment was 642.58 CHF (US$510, £290, €410), a two room apartment was about 741.20 CHF (US$590, £330, €470), a three room apartment was about 945.28 CHF (US$760, £430, €600) and a six or more room apartment cost an average of 1648.96 CHF (US$1320, £740, €1060). The average apartment price in Interlaken was 90.9% of the national average of 1116 CHF. The vacancy rate for the municipality, in 2010, was 0.1%.
The historical population is given in the following chart:
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