The U.S. state that is home to Yellowstone National Park is Wyoming. Established in 1872, Yellowstone was the first national park in the United States and is renowned for its geothermal features, including the famous Old Faithful geyser. The park encompasses diverse ecosystems, picturesque landscapes, and abundant wildlife, making it a popular destination for tourists and nature enthusiasts. In addition to Wyoming, parts of Yellowstone extend into Montana and Idaho, highlighting its vast expanse and ecological significance. The park plays a crucial role in conservation and environmental education.