Aarau District is a district in the Swiss Canton of Aargau with administrative capital Aarau encompasses the agglomeration of Aarau south of the Juras.

In 2009, the Aargau District had a total area of 104.48 square kilometers (40.34 sq mi).

[1] In December 2018, Aarau District had a population of 80,309.

The average number of people per household was 2.24 individuals.

[5] From the 2000 census, 17,246 or 27.3% were Roman Catholic, while 31,124 or 49.3% belonged to the Swiss Reformed Church.