Leutwil is a municipality in the district of Kulm in the canton of Aargau in Switzerland.

[3] The rights to high justice in the village in the late 13th and 14th century was held by the Habsburgs.

The rights to low justice was held by the lords of Trostburg, and later those of Reinach and Hallwyl.

Between 1415 and 1798 the municipality belonged to the city of Bern as part of the bailiwick of Lenzburg.

[3] Leutwil is located in the Kulm district, on a northern spur of the Reinacher Homberg mountain.

Of the rest of the land, 0.41 square kilometers (0.16 sq mi) or 10.9% is settled (buildings or roads).

37.1% of the total land area is heavily forested and 1.6% is covered with orchards or small clusters of trees.

[8] The age distribution, as of 2008[update], in Leutwil is; 77 children or 10.5% of the population are between 0 and 9 years old and 100 teenagers or 13.6% are between 10 and 19.

[10] About 70% 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).

[12] The historical population is given in the following table:[3] The Baumann farm house at Zopfweg 2 is listed as a Swiss heritage site of national significance.

[8] From the 2000 census[update], 91 or 13.7% were Roman Catholic, while 479 or 72.4% belonged to the Swiss Reformed Church.