Villmergen is a municipality in the district of Bremgarten in the canton of Aargau in Switzerland.

In 1337, the patronage right to the village church was held by the knightly family of Hallwyl.

The Protestants' victory in the Second Battle of Villmergen, brought an end to the Catholic hegemony in the Swiss Confederation and prevented further conflict until the renewed outbreak of civil war until 1847.

That year, the Sonderbund war led to the formation of Switzerland as a federal state.

Under the short-lived Helvetic Republic, Villmergen was part of the District of Sarmenstorf in 1798.

During the Sonderbund War, was a battle between cantonal forces and local militia troops in the municipality.

Of the rest of the land, 22.3% is settled (buildings or roads) and the remainder (0.2%) is non-productive (rivers or lakes).

[5] The blazon of the municipal coat of arms is Argent a Rose Gules barbed and seeded proper.

[5] The age distribution, as of 2008[update], in Villmergen is; 573 children or 10.4% of the population are between 0 and 9 years old and 644 teenagers or 11.7% are between 10 and 19.

These sites are; the farm house at Halde, the main building of the former Bally factory at Bahnhofstrasse 66, and the Catholic parish church on Kirchgasse.

[5] From the 2000 census[update], 3,239 or 63.8% were Roman Catholic, while 957 or 18.8% belonged to the Swiss Reformed Church.