Birmenstorf is a municipality in the district of Baden in the canton of Aargau in Switzerland.

[3] In 1415, the Eidgenossenschaft conquered the Aargau, and Birmenstorf as part of the Habsburg County of Baden came under their sovereignty.

[citation needed] The village proper was most likely founded by Alamanni settlers probably in the 6th century.

Of the rest of the land, 15.8% is settled (buildings or roads) and the remainder (3.4%) is non-productive (rivers or lakes).

It consists of the village of Birmenstorf and the hamlets of Lindmühle, Muntwil, Müslen and Oberhard as well as a new housing development.

Most of the population (as of 2000[update]) speaks German (90.3%), with Portuguese being second most common ( 2.0%) and Albanian being third ( 1.6%).

[4] The age distribution, as of 2008[update], in Birmenstorf is; 249 children or 10.0% of the population are between 0 and 9 years old and 301 teenagers or 12.1% are between 10 and 19.

[11] From the 2000 census[update], 1,108 or 47.9% are Roman Catholic, while 766 or 33.1% belonged to the Swiss Reformed Church.