Of all 50 states, Wyoming has the lowest population, with 563,626 people. Wyoming's capital and largest city is Cheyenne, and the state's land area is 97,100 square miles, with a population density of 5.8 persons per square mile. Its most famous national park, Yellowstone, was the first national park in the U.S. and is now home to many animals, including the otherwise-rare American bison. Located in the West, two-thirds of Wyoming is covered with mountain ranges in the foothills of the Rocky Mountains. Six states border Wyoming: To the north, Montana; to the south, Colorado; to the east, South Dakota and Nebraska; to the southwest, Utah; to the west, Idaho.