Sitemap to all pages covering the state of Colorado. Many thanks to David Wilson, Joe Lockhart, Kenyon Schuett and Matthew Salek for accompanying us on these roadtrips through the Centennial State. Photography contributions by Alex Nitzman, Andy Field and Brent Ivy.

Highway Guides

With some exceptions, Colorado Department of Transportation (CDOT) generally does not sign overlaps. Instead shared alignments across the state are inventoried as one route. This results in several disconnected segments of U.S. and State Highways, with implied overlaps using other routes. Such is the case with U.S. 6, where 13 segments make up the overall 467.28 mile route across the state. The route is not posted along Interstate 70, which replaced it throughout the Rocky Mountains. Figures cited throughout the site were obtained from the CDOT Straight Line Diagram Tool.

Population Statistics

State Population
5,773,714
Metropolitan Populations
Denver-Aurora-
Lakewood
2,963,821 Colorado Springs 755,105 Fort Collins 359,066
Boulder 330,758 Greeley 328,981 Pueblo 168,162
Top County Populations
El Paso 730,395 Denver 715,522 Arapahoe 655,070
Jefferson 582,910 Adams 519,572 Larimer 359,066
Douglas 357,978 Boulder 330,758 Weld 328,981
Top City Populations
Denver 735,538 Colorado Springs 482,131 Aurora 387,377
Fort Collins 1168,234 Lakewood 157,429 Thornton 148,113
Arvada 121,936 Westminster 115,046 Pueblo 112,751
Centennial 110,156 Greeley 108,958 Boulder 107,645
Sources: 2020 U.S. Census Data (metro populations and counties), 2020 U.S. Census Estimate (cities)

About Colorado

  • Capital: Denver
  • Nickname: Centennial State
  • Colorado has an average elevation of 6,800 feet above sea level
  • Over 50 mountain peaks in Colorado are over 14,000 feet above sea level (referred to as the “fourteeners”)
  • Area: 104,093.57 square miles or 269,596 square kilometers, 8th largest
  • Statehood: 38th state; admitted August 1, 1876
  • Total Interstate Mileage: 951.85 miles
  • Highest Point: Mount Elbert (southwest of Leadville and east of Aspen) 14,433 Feet above Sea Level

Updated January 31, 2022.