It is found in British Columbia in Canada and in Washington and Alaska in the United States.

John Henry Keen, who collected the specimen that formed the basis for the first scientific description of the species.

[4] In appearance, Keen's myotis is very similar to other long-eared bats of the same range, with characteristic dark brown patches on the shoulders.

[5] Keen's myotis prefers coastal habitats, but is often found in urban areas as well.

[5] Keen's myotis probably exhibits the same breeding habits of other temperate vespertilionids, but there is little data available.