Capital city Denver
Population 5.773.714 (2020)
Surface 269.837 km²
Governor Jared Polis (D)
Member of the US since 1876

Colorado is one of the fifty states of the United States. The state is located in the center of the country. Colorado’s abbreviation is CO. Its nickname is ‘The Centennial State’. With 5,116,796 inhabitants, Colorado is the 21st most populous state in the US. Colorado borders the states of New Mexico, Oklahoma, Kansas, Nebraska, Wyoming, and Utah. The famous Colorado River flows through Colorado. The capital of Colorado is Denver.


There are many cities in Colorado. Here are the five largest.

Largest Cities in Colorado

Name Residents County
1. Denver 619.968 Denver County
2. Colorado Springs 426.388 El Paso County
3. Aurora 332.354 Araphoe, Douglas & Adams County
4. Fort Collins 146.762 Larimer County
5. Lakewood 144.406 Jefferson County

How many counties in Colorado? The State of Colorado comprises 64 counties.


the region where today’s Colorado is located has been inhabited by Native Americans for 13,000 years. The Ute inhabited the mountain valleys of the southern and western Rocky Mountains. The Arapaho and Cheyenne moved west to hunt on the High Plains.


Denver is the capital of the state of Colorado in the United States. It is located in the Rocky Mountains. There used to be many gold miners in the city. Denver had a population of 610,345 in the year 2009, making it the 24th largest city in the country. It is also the capital of Colorado. The city is exactly one mile high. That’s why many people call Denver “The Mile High City.” Denver has a mild climate.

Partner cities

Denver skyline

  • Aksum (Ethiopia)
  • Brest (France)
  • Madras (India)
  • Cuernavaca (Mexico)
  • Karmiel (Israel)
  • Kunming (China)
  • Nairobi (Kenya)
  • Potenza (Italy)
  • Takayama (Japan)
  • Ulaanbaatar (Mongolia)

Colorado Springs

Colorado Springs is a large city in the United States with a population of 414,660 in the year 2010. You can tell from the name that the city is located in the US state of Colorado. Colorado is actually also a name of a river. After DenverThis is the largest city in all of Colorado and together they are the financial, industrial, political and cultural centers of the state. The population of Colorado Springs is growing very fast. In the future, the population will reach 500,000. Colorado Springs is an important site for the US military. High-tech industry is the main industry in the city. Much of the population in Colorado Springs is Hispanic. The city is known for its tall skyscrapers and old buildings. It has a large conurbation/metropolis of about 626,000 inhabitants.

Partner cities

Colorado Springs skyline

  • Japan Fujiyoshida (Japan)
  • Taiwan Kaohsiung (Taiwan)
  • Russia Smolensk (Russia)
  • Kyrgyzstan Bishkek (Kyrgyzstan)
  • Mexico Nuevo Casas Grandes (Mexico)
  • Australia Bankstown (Australia)

Interstate 225 in Colorado

Get started Denver
End Aurora
Length 12 mi
Length 19 km
  • 0 → Denver / Colorado Springs1 DTC Boulevard
  • 2 Yosemite Street
  • 4 Parker Road
  • 5 Iliff Avenue
  • 7 Mississippi Avenue
  • 8 Alameda Avenue
  • 9 6th Avenue
  • 10 Colfax Avenue
  • 12 → Salt Lake City / Kansas City

Interstate 225 or I -225 is an Interstate Highway in the American city of Denver, Colorado. The highway forms an eastern bypass of Denver, primarily opening up Aurora, Denver’s largest suburb. The route is 19 kilometers long.

Travel directions

The southern terminus of I-225.

In a modern business park, I-225 exits from Interstate 25, which runs from Albuquerque to Denver. There are 2×3 lanes. A light rail link runs in the median, connecting Aurora with the business park on the south side of Denver and in the suburb of Centennial. Further on, the road widens to 2×4 lanes. At the shoulder of the highway is the Cherry Creek Dam, a 40-meter high dam that connects Denverprovides water. To the south of Aurora, State Route 83 exits, and the highway narrows from 2×4 to 2×3 lanes. Aurora is Denver’s largest suburb, more than half the size of Denver itself with a population of 339,000. The city still has to grow to 550,000 inhabitants, the same size as Denver itself. Aurora itself also has some business parks along the highway. In the north of Aurora, the highway ends at Interstate 70, which runs from Denver to Kansas City.


Construction of the highway began in 1964, and has been constructed from north (I-70) to south (I-25). In 1976, the final section in southern Denver opened to traffic. The I-225 is not particularly important through traffic, there is relatively little traffic from Colorado Springs to Kansas City and vice versa that takes this route.


Between 1994 and 2005, the highway was gradually widened to 2×3 lanes, except for a portion in Aurora. The section through Aurora was widened to 2×3 lanes between 2012 and 2014.

Opening history

I-225 at Parker Road ( SR-83 ).

From Unpleasant Length Opening
Exit 9 exit 12 5 km 06-1966
Exit 4 Exit 9 8 km 03-09-1971
Exit 2 Exit 4 3 km 27-05-1975
exit 0 Exit 2 3 km 21-05-1976

Traffic intensities

Location AADT 2012
exit 0 127,000
Exit 2 131,000
Exit 4 107,000
Exit 7 120,000
Exit 10 126,000

Lane Configuration

from nasty Lanes length
exit 0 Exit 2 2×3 2 km
Exit 2 Exit 4 2×4 3 km
Exit 4 exit 12 2×3 13 km

Colorado - The Centennial State

Colorado – The Centennial State
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