Wyoming is a state in the Rocky Mountain region of the United States of America. Cheyenne is the capital and the most populous city in Wyoming, with a population estimate of 63,335 in 2015. The state population was estimated at 586,107 in 2015. Located in the northwest corner of Wyoming, Yellowstone National Park and Grand Teton National Park are places everyone should see at least once in their lifetimes. Summers in Wyoming are warm with July high temperatures averaging between 29 and 35 °C in most of the state.