Kandersteg has a population (as of December 2018) of 1,298.
 As of 2010, 17.9% of the population are resident foreign nationals.
 Over the last 10 years (2000-2010) the population has changed at a rate of 4.3%.
 Migration accounted for 9.7%, while births and deaths accounted for -4.5%.

Most of the population (as of 2000) speaks German (1,022 or 89.9%) as their first language, Portuguese is the second most common (32 or 2.8%) and English is the third (13 or 1.1%).
 There are 12 people who speak French, 5 people who speak Italian.

As of 2008, the population was 48.3% male and 51.7% female.
 The population was made up of 486 Swiss men (39.5% of the population) and 108 (8.8%) non-Swiss men.
 There were 525 Swiss women (42.6%) and 112 (9.1%) non-Swiss women.
 Of the population in the municipality, 403 or about 35.4% were born in Kandersteg and lived there in 2000.
 There were 355 or 31.2% who were born in the same canton, while 154 or 13.5% were born somewhere else in Switzerland, and 181 or 15.9% were born outside of Switzerland.

As of 2010, children and teenagers (0–19 years old) make up 16.2% of the population, while adults (20–64 years old) make up 61.9% and seniors (over 64 years old) make up 21.9%.

As of 2000, there were 436 people who were single and never married in the municipality.
 There were 597 married individuals, 72 widows or widowers and 32 individuals who are divorced.

As of 2000, there were 166 households that consist of only one person and 27 households with five or more people.
 In 2000, a total of 467 apartments (48.5% of the total) were permanently occupied, while 434 apartments (45.1%) were seasonally occupied and 61 apartments (6.3%) were empty.
 As of 2010, the construction rate of new housing units was 32.5 new units per 1000 residents.
 The vacancy rate for the municipality, in 2011, was 3.8%.

The historical population is given in the following chart:
The population rose sharply between 1906 and 1913 with the construction of the Lötschberg railway line.
Kandersteg has a population (as of December 2018) of 1,298.  As of 2010, 17.9% of the population are resident foreign nationals.  Over the last 10 years (2000-2010) the population has changed at a rate of 4.3%.  Migration accounted for 9.7%, while births and deaths accounted for -4.5%.
Most of the population (as of 2000) speaks German (1,022 or 89.9%) as their first language, Portuguese is the second most common (32 or 2.8%) and English is the third (13 or 1.1%).  There are 12 people who speak French, 5 people who speak Italian.
As of 2008, the population was 48.3% male and 51.7% female.  The population was made up of 486 Swiss men (39.5% of the population) and 108 (8.8%) non-Swiss men.  There were 525 Swiss women (42.6%) and 112 (9.1%) non-Swiss women.  Of the population in the municipality, 403 or about 35.4% were born in Kandersteg and lived there in 2000.  There were 355 or 31.2% who were born in the same canton, while 154 or 13.5% were born somewhere else in Switzerland, and 181 or 15.9% were born outside of Switzerland.
As of 2010, children and teenagers (0–19 years old) make up 16.2% of the population, while adults (20–64 years old) make up 61.9% and seniors (over 64 years old) make up 21.9%.
As of 2000, there were 436 people who were single and never married in the municipality.  There were 597 married individuals, 72 widows or widowers and 32 individuals who are divorced.
As of 2000, there were 166 households that consist of only one person and 27 households with five or more people.  In 2000, a total of 467 apartments (48.5% of the total) were permanently occupied, while 434 apartments (45.1%) were seasonally occupied and 61 apartments (6.3%) were empty.  As of 2010, the construction rate of new housing units was 32.5 new units per 1000 residents.  The vacancy rate for the municipality, in 2011, was 3.8%.
The historical population is given in the following chart:
The population rose sharply between 1906 and 1913 with the construction of the Lötschberg railway line.
Kandersteg