 Over the last 10 years the population has grown at a rate of 7.4%.Most of the population () speaks German (86.0%), with Italian being second most common ( 3.8%) and Serbo-Croatian being third ( 2.2%).The age distribution, , in Oberentfelden is; 708 children or 9.7% of the population are between 0 and 9 years old and 896 teenagers or 12.3% are between 10 and 19.