Colorado is typically thought as of a completely mountainous state, however it is split down the middle north to south by the Rocky Mountains and to the east is a region of high wide prairie. To the west are rugged mountains arranged in various groups or ranges. Most of the major cities and towns of Colorado 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 which includes the state capital and largest city, Denver.

Nicknamed "The Mile-High City" because its official elevation, measured on the fifteenth step of the state capitol building's west side, is one statute mile (5,280 feet). The Denver-Aurora metropolitan area contains over half of the state's population (2.5 million out of 4.3 million).

The state's economy is diversified and notable for its concentration of scientific research and high-technology industries. Other industries include food processing, transportation equipment, machinery, chemical products, minerals such as gold and molybdenum, and tourism. Denver is an important financial center.

• Denver-Aurora
• Arvada
• Centennial
• Lakewood
• Thornton
• Westminster
• Colorado Springs
• Fort Collins -Loveland
• Pueblo