Oberentfelden is a municipality in the district of Aarau of the canton of Aargau in Switzerland.

Of the rest of the land, 28% is settled (buildings or roads) and the remainder (0.3%) is non-productive (rivers or lakes).

[4] The municipality is located in the Aarau district in the lower Suhr valley.

In a public votation a change was highly rejected because everyone loved the duck.

[4] The age distribution, as of 2008[update], 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.

[11] In the 2007 federal election the most popular party was the SVP which received 38.9% of the vote.

[10] The historical population is given in the following table:[3] In the 1995 inventory, the remains of the Ancient Roman estate in Oberentfelden was listed as a heritage site of national significance.

From the 2000 census[update], 1,835 or 27.2% are Roman Catholic, while 3,368 or 50.0% belonged to the Swiss Reformed Church.