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
Top County Populations
Denver 554,636 Jefferson 527,056 El Paso 516,929
Arapahoe 487,967 Adams 363,857 Boulder 291,288
Larimer 251,494 Weld 180,936 Douglas 175,766
Top City Populations
Denver 554,636 Colorado Springs 360,890 Aurora 276,393
Lakewood 144,126 Fort Collins 118,652 Arvada 102,153
Pueblo 102,121 Westminster 100,940 Boulder 94,673
Source: 2000 U.S. Census Data

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