The state with the largest number of volcanoes is Alaska. Out of the 169 volcanoes in the United States, more than 130 volcanoes and volcanic fields are located in Alaska.
The U.S. Geological Survey has classified 18 volcanoes in the country to be extremely-high-threat volcanoes, five of which are found in Alaska. These include Akutan Volcano, Augustine Volcano, Makushin Volcano, Redoubt Volcano and Spurr Volcano. Most of Alaska's volcanoes are situated along the Aleutian Arc, which extends for 1,550 miles. Experts believe that eruptions originating from the Cook Inlet volcanoes, comprised of Augustine, Redoubt, Spurr and Iliamna, may result to severe damages and heavy casualties, as these volcanoes are closest to Anchorage, the state's most populous city.