Hawaii

The highest peak in Hawaii is Mauna Kea, a dormant volcano.

An excerpt from the article 16 facts about Hawaii

Its height is 4207,3 m above sea level, and is located on the largest island of the archipelago - Hawaiʻi. The last eruption took place 6000 to 4000 years ago. It is one of five volcanoes that contributed to the formation of the island.