Adak /ˈeɪdæk/, formerly Adak Station, (Unangax̂: Adaax) is a city located on Adak Island, in the Aleutians West Census Area, Alaska, United States. At the 2010 census the population was 326. It is the westernmost municipality in the United States and the southernmost city in Alaska. (See Extreme points of the United States.) The city is the former location of the Adak Army Base and Adak Naval Operating Base, NAVFAC Adak.