 Of the population in the municipality, 240 or about 55.0% were born in Rohrbachgraben and lived there in 2000.There were 148 or 33.9% who were born in the same canton, while 33 or 7.6% were born somewhere else in Switzerland, and 8 or 1.8% were born outside of Switzerland., children and teenagers (0–19 years old) make up 27.8% of the population, while adults (20–64 years old) make up 56.8% and seniors (over 64 years old) make up 15.4%.