Aleutians West Census Area is a census area located in the U.S. state of Alaska. As of the 2010 census, the population was 5,561. It is part of the Unorganized Borough and therefore has no borough seat. Its largest city is Unalaska. It contains most of the Aleutian Islands, from Attu Island in the west to Unalaska Island in the east, as well as the Pribilof Islands, which lie north of the Aleutians in the Bering Sea.