Denver is the capital and largest city. As of 2000, the state's population was 4,301,261. The state is in the Mountain, Southwestern and Central regions of the country.East of the Front Range of the Rocky Mountains are the Colorado Eastern Plains, the section of the Great Plains within Colorado at elevations ranging from 3,500 to 7,000 feet .The plains are sparsely settled with most population along the South Platte and the Arkansas rivers and the I-70 corridor. The major cities and towns lie just east of the Front Range, in the I-25 corridor. The majority of the population of Colorado lives in this densely urbanized strip.