Attu is a census-designated place (CDP) located on Attu Island in the Aleutians West Census Area in the U.S. state of Alaska. The community consisted entirely of Coast Guard personnel who resided and worked at Casco Cove Coast Guard Station, but they left the island when the station was closed in August 2010, leaving it uninhabited. As of the 2020 census, Attu Station had a population of 0. LORAN Station Attu had provided a navigational signal for mariners of the North Pacific since the 1970s.