In which U.S. state is Mount St. Helens located?

Mount St. Helens is located in Washington state, in the Pacific Northwest of the United States.

The active stratovolcano stands in Skamania County, within the Cascade Range and the Cascade Volcanic Arc. It lies about 83 kilometers northeast of Portland, Oregon, and 158 kilometers south of Seattle, Washington—near enough to Oregon that the state boundary can cause confusion.

The mountain became internationally famous after its catastrophic eruption on May 18, 1980. A magnitude 5.1 earthquake triggered a massive north-flank landslide, followed by a lateral blast that devastated surrounding forests and lowered the summit. Fifty-seven people died, and the event remains the most economically destructive volcanic eruption in U.S. history.

Mount St. Helens is not Alaska’s Mount St. Elias, California’s Mount Shasta, or Oregon’s Mount Hood. Those are separate peaks in other volcanic regions. Today, the volcano is part of the Mount St. Helens National Volcanic Monument, established in 1982.