Salvan has a population (as of December 2018) of 1,395.
 As of 2008, 7.1% of the population are resident foreign nationals.
 Over the last 10 years (2000–2010 ) the population has changed at a rate of 0.6%.
 It has changed at a rate of 7.1% due to migration and at a rate of -3.9% due to births and deaths.

Most of the population (as of 2000) speaks French (947 or 92.8%) as their first language, German is the second most common (31 or 3.0%) and Dutch is the third (10 or 1.0%).
 There are 6 people who speak Italian.

As of 2008, the population was 47.4% male and 52.6% female.
 The population was made up of 495 Swiss men (44.4% of the population) and 33 (3.0%) non-Swiss men.
 There were 538 Swiss women (48.3%) and 48 (4.3%) non-Swiss women.
 Of the population in the municipality, 522 or about 51.2% were born in Salvan and lived there in 2000.
 There were 159 or 15.6% who were born in the same canton, while 168 or 16.5% were born somewhere else in Switzerland, and 141 or 13.8% were born outside of Switzerland.

As of 2000, children and teenagers (0–19 years old) make up 22.5% of the population, while adults (20–64 years old) make up 57.4% and seniors (over 64 years old) make up 20.1%.

As of 2000, there were 381 people who were single and never married in the municipality.
 There were 500 married individuals, 77 widows or widowers and 62 individuals who are divorced.

As of 2000, there were 439 private households in the municipality, and an average of 2.2 persons per household.
 There were 163 households that consist of only one person and 25 households with five or more people.
 In 2000, a total of 418 apartments (38.3% of the total) were permanently occupied, while 601 apartments (55.0%) were seasonally occupied and 73 apartments (6.7%) were empty.
 As of 2009, the construction rate of new housing units was 8.1 new units per 1000 residents.

The historical population is given in the following chart:
Salvan has a population (as of December 2018) of 1,395.  As of 2008, 7.1% of the population are resident foreign nationals.  Over the last 10 years (2000–2010 ) the population has changed at a rate of 0.6%.  It has changed at a rate of 7.1% due to migration and at a rate of -3.9% due to births and deaths.
Most of the population (as of 2000) speaks French (947 or 92.8%) as their first language, German is the second most common (31 or 3.0%) and Dutch is the third (10 or 1.0%).  There are 6 people who speak Italian.
As of 2008, the population was 47.4% male and 52.6% female.  The population was made up of 495 Swiss men (44.4% of the population) and 33 (3.0%) non-Swiss men.  There were 538 Swiss women (48.3%) and 48 (4.3%) non-Swiss women.  Of the population in the municipality, 522 or about 51.2% were born in Salvan and lived there in 2000.  There were 159 or 15.6% who were born in the same canton, while 168 or 16.5% were born somewhere else in Switzerland, and 141 or 13.8% were born outside of Switzerland.
As of 2000, children and teenagers (0–19 years old) make up 22.5% of the population, while adults (20–64 years old) make up 57.4% and seniors (over 64 years old) make up 20.1%.
As of 2000, there were 381 people who were single and never married in the municipality.  There were 500 married individuals, 77 widows or widowers and 62 individuals who are divorced.
As of 2000, there were 439 private households in the municipality, and an average of 2.2 persons per household.  There were 163 households that consist of only one person and 25 households with five or more people.  In 2000, a total of 418 apartments (38.3% of the total) were permanently occupied, while 601 apartments (55.0%) were seasonally occupied and 73 apartments (6.7%) were empty.  As of 2009, the construction rate of new housing units was 8.1 new units per 1000 residents.
The historical population is given in the following chart:
Salvan, Switzerland