 Of the population in the municipality 690 or about 76.9% were born in Saint-Martin and lived there in 2000.There were 84 or 9.4% who were born in the same canton, while 63 or 7.0% were born somewhere else in Switzerland, and 29 or 3.2% were born outside of Switzerland.The age distribution of the population () is children and teenagers (0–19 years old) make up 22.1% of the population, while adults (20–64 years old) make up 54.7% and seniors (over 64 years old) make up 23.2%.