U.S. Geological Survey Volcano Hazards Program FAQs:

"There are about 169 volcanoes in the United States that scientists consider active. Most of these are located in Alaska, where eruptions occur virtually every year. Others are located throughout the west and in Hawaii (see our Volcano Activity Map for their locations). Kilauea volcano in Hawaii is one of the most active volcanoes on Earth. It has been erupting almost continuously since 1983."

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U.S. Volcanoes and Current Activity Alerts (Map Tool), U.S. Geological Survey

Interactive map showing the location and activity levels of all volcanoes in the United States and its territories

Volcano Notification Service (Notification Service), U.S. Geological Survey

Sign-up page for a free service offering notifications about volcanic activity at U.S. monitored volcanoes