 From the Commander Islands eastward they are found throughout the Aleutian Islands to the Sanak Islands, Cherni Island, Deer Island, the Pavlof Islands, and the Shumagin Islands.This area constitutes the western sub-population of "F. p. pealei" and is an estimated 375-580 breeding pairs strong in Alaskan territory and 20-25 pairs in Russian territory.This group has a very uniformely and densely distributed population, with roughly 5–8 miles of coastline between each eyrie on average.