The capital of Colorado is Denver. Denver is also the most populated city in Colorado. Since the 2010 census, Denver saw a 19.22% increase in population and is continuing to grow! Denver is in the South Platte River Valley just east of the Front Range of the Rocky Mountains. It got its name from James W. Denver, a governor of the Kansas Territory, and its nickname, the Mile High City, because its official elevation is exactly one mile above sea level. If you plan to move to Colorado, you’ll probably find yourself here!