Unterperfuss is located in the Inn Valley, about 15 km west of Innsbruck, opposite Zirl.

With an area of two square kilometers and about 200 inhabitants, it is one of the smallest municipalities in Tyrol.

In the cadastre of that time, eleven houses are listed, ten of which were farms that were subject to the Stams monastery.

Forests are mentioned as community property, which were reserved for water protection structures on the Inn and Melach rivers.

The family names at that time were Härtnagl, Mayr, Maizner, Wolf, Schiz, Hofer, Schaffenrath, Klaisner, Pranger and Fiz.