Quandahl is an unincorporated community in Allamakee County, Iowa, United States.

[1] Quandahl was founded in the northwestern corner of the county; the community's post office opened in 1877 and closed in 1906.

[2] Quandahl's population was 28 in 1902,[3] and was 42 in 1925.

[5] The community is adjacent to the Bear Creek Public Access area.

This article about the geography of Allamakee County, Iowa is a stub.