Brittnau is a municipality in the district of Zofingen in the canton of Aargau in Switzerland.

[3] Brittnau has an area, as of 2009[update], of 13.69 square kilometers (5.29 sq mi).

Of the rest of the land, 1.62 km2 (0.63 sq mi) or 11.8% is settled (buildings or roads), 0.1 km2 (25 acres) or 0.7% is either rivers or lakes.

[4] The municipality is located in the Zofingen district on the left side of the mid-Wigger river valley (Wiggertal).

It comprises Brittnau itself and the following villages: The municipality borders Wikon, Langnau bei Reiden, Pfaffnau, Murgenthal, Vordemwald, Strengelbach and Zofingen.

The blazon of the municipal coat of arms is Gules a Bend wavy sinister Argent and Coupeaux Vert.

[8] The age distribution, as of 2008[update], in Brittnau is; 384 children or 10.5% of the population are between 0 and 9 years old and 449 teenagers or 12.3% are between 10 and 19.

[10] About 60.8% of the total households were owner occupied, or in other words did not pay rent (though they may have a mortgage or a rent-to-own agreement).

[8] From the 2000 census[update], 723 or 21.3% were Roman Catholic, while 2,240 or 65.9% belonged to the Swiss Reformed Church.