During the 2009–10 school year, there were a total of 384 students attending classes in Pieterlen. There were 4 kindergarten classes with a total of 72 students in the municipality. Of the kindergarten students, 22.2% were permanent or temporary residents of Switzerland (not citizens) and 48.6% have a different mother language than the classroom language. The municipality had 10 primary classes and 206 students. Of the primary students, 33.5% were permanent or temporary residents of Switzerland (not citizens) and 32.5% have a different mother language than the classroom language. During the same year, there were 6 lower secondary classes with a total of 89 students. There were 24.7% who were permanent or temporary residents of Switzerland (not citizens) and 29.2% have a different mother language than the classroom language.