The city known as the "Mile-High City" is Denver, Colorado.

Denver earns its nickname because it is located at an elevation of exactly one mile (5,280 feet or 1,609 meters) above sea level. This elevation gives Denver its distinct climate and geography, including nearby access to the Rocky Mountains. The nickname reflects its position in the high-altitude region of the United States. Denver is known for its vibrant culture, outdoor recreational opportunities, and proximity to natural attractions like Rocky Mountain National Park. It is a hub for arts, history, and modern urban living with breathtaking mountain views.