The Most Dangerous Volcanoes in the United States

Source: Katmai National Park and Preserve / Flickr

26. Mount Mageik, Alaskan Peninsula
> Overall threat score: 106
> Population within 30 km (approx. 18 miles): Not available
> Population within 100 km (approx. 30 miles): 376
> Most recent eruption year: -500

Source: Captain Budd Christman, NOAA Corps / Wikimedia Commons

25. Mount Katmai, Alaskan Peninsula
> Overall threat score: 106
> Population within 30 km (approx. 18 miles): Not available
> Population within 100 km (approx. 30 miles): 128
> Most recent eruption year: 1912

Source: ruggybear / Flickr

24. Mono-Inyo Craters, California
> Overall threat score: 106
> Population within 30 km (approx. 18 miles): 9,048
> Population within 100 km (approx. 30 miles): 82,160
> Most recent eruption year: 1380

Source: krisbasonphotography / iStock via Getty Images

23. Hualālai, Hawaii
> Overall threat score: 109
> Population within 30 km (approx. 18 miles): 46,959
> Population within 100 km (approx. 30 miles): 166,240
> Most recent eruption year: 1801

Source: M. Williams, National Park Service / Wikimedia Commons

22. Aniakchak Crater, Alaskan Peninsula
> Overall threat score: 112
> Population within 30 km (approx. 18 miles): 36
> Population within 100 km (approx. 30 miles): 479
> Most recent eruption year: 1931