The U.S. state known for having the least population is Wyoming. With a population of approximately 580,000, it is the least populous state in the country, despite its vast land area. Wyoming is renowned for its stunning natural landscapes, including Yellowstone National Park, the first national park in the world. Its economy largely relies on industries like agriculture, mining, and tourism, attracting visitors for outdoor activities such as hiking, fishing, and wildlife viewing in its pristine environments.